This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
[perl #78494] Pipes cause threads to hang on join()
[perl5.git] / pod / perldiag.pod
CommitLineData
a0d0e21e
LW
1=head1 NAME
2
3perldiag - various Perl diagnostics
4
5=head1 DESCRIPTION
6
7These messages are classified as follows (listed in increasing order of
8desperation):
9
10 (W) A warning (optional).
d1d15184 11 (D) A deprecation (enabled by default).
00eb3f2b 12 (S) A severe warning (enabled by default).
a0d0e21e
LW
13 (F) A fatal error (trappable).
14 (P) An internal error you should never see (trappable).
54310121 15 (X) A very fatal error (nontrappable).
cb1a09d0 16 (A) An alien error message (not generated by Perl).
a0d0e21e 17
75b44862 18The majority of messages from the first three classifications above
64977eb6 19(W, D & S) can be controlled using the C<warnings> pragma.
e476b1b5
GS
20
21If a message can be controlled by the C<warnings> pragma, its warning
22category is included with the classification letter in the description
23below.
24
25Optional warnings are enabled by using the C<warnings> pragma or the B<-w>
26and B<-W> switches. Warnings may be captured by setting C<$SIG{__WARN__}>
27to a reference to a routine that will be called on each warning instead
28of printing it. See L<perlvar>.
29
b7eceb5b 30Severe warnings are always enabled, unless they are explicitly disabled
e476b1b5 31with the C<warnings> pragma or the B<-X> switch.
4438c4b7 32
748a9306 33Trappable errors may be trapped using the eval operator. See
4438c4b7
JH
34L<perlfunc/eval>. In almost all cases, warnings may be selectively
35disabled or promoted to fatal errors using the C<warnings> pragma.
36See L<warnings>.
a0d0e21e 37
6df41af2
GS
38The messages are in alphabetical order, without regard to upper or
39lower-case. Some of these messages are generic. Spots that vary are
40denoted with a %s or other printf-style escape. These escapes are
41ignored by the alphabetical order, as are all characters other than
42letters. To look up your message, just ignore anything that is not a
43letter.
a0d0e21e
LW
44
45=over 4
46
6df41af2 47=item accept() on closed socket %s
33633739 48
be771a83
GS
49(W closed) You tried to do an accept on a closed socket. Did you forget
50to check the return value of your socket() call? See
51L<perlfunc/accept>.
33633739 52
de42a5a9 53=item Allocation too large: %x
a0d0e21e 54
6df41af2 55(X) You can't allocate more than 64K on an MS-DOS machine.
a0d0e21e 56
1109a392 57=item '%c' allowed only after types %s
ef54e1a4 58
1109a392
MHM
59(F) The modifiers '!', '<' and '>' are allowed in pack() or unpack() only
60after certain types. See L<perlfunc/pack>.
ef54e1a4 61
6df41af2 62=item Ambiguous call resolved as CORE::%s(), qualify as such or use &
43192e07 63
75b44862 64(W ambiguous) A subroutine you have declared has the same name as a Perl
be771a83
GS
65keyword, and you have used the name without qualification for calling
66one or the other. Perl decided to call the builtin because the
67subroutine is not imported.
43192e07 68
6df41af2
GS
69To force interpretation as a subroutine call, either put an ampersand
70before the subroutine name, or qualify the name with its package.
71Alternatively, you can import the subroutine (or pretend that it's
72imported with the C<use subs> pragma).
43192e07 73
6df41af2 74To silently interpret it as the Perl operator, use the C<CORE::> prefix
496a33f5 75on the operator (e.g. C<CORE::log($x)>) or declare the subroutine
be771a83
GS
76to be an object method (see L<perlsub/"Subroutine Attributes"> or
77L<attributes>).
43192e07 78
cba5a3b0
DG
79=item Ambiguous overloaded argument to %s resolved as %s
80
81(W ambiguous) You called C<keys>, C<values> or C<each> on an object that had
82overloading of C<%{}> or C<@{}> or both. In such a case, the object is
83dereferenced according to its overloading, not its underlying reference type.
84The warning is issued when C<%{}> overloading exists on a blessed arrayref,
85when C<@{}> overloading exists on a blessed hashref, or when both overloadings
86are defined (in which case C<%{}> is used). You can force the interpretation
c69ca1d4 87of the object by explicitly dereferencing it as an array or hash instead of
cba5a3b0
DG
88passing the object itself to C<keys>, C<values> or C<each>.
89
c2e66d9e
GS
90=item Ambiguous range in transliteration operator
91
92(F) You wrote something like C<tr/a-z-0//> which doesn't mean anything at
93all. To include a C<-> character in a transliteration, put it either
94first or last. (In the past, C<tr/a-z-0//> was synonymous with
95C<tr/a-y//>, which was probably not what you would have expected.)
96
6df41af2 97=item Ambiguous use of %s resolved as %s
43192e07 98
6df41af2
GS
99(W ambiguous)(S) You said something that may not be interpreted the way
100you thought. Normally it's pretty easy to disambiguate it by supplying
101a missing quote, operator, parenthesis pair or declaration.
a0d0e21e 102
d8225693
JM
103=item Ambiguous use of %c resolved as operator %c
104
105(W ambiguous) C<%>, C<&>, and C<*> are both infix operators (modulus,
3303f755
FC
106bitwise and, and multiplication) I<and> initial special characters
107(denoting hashes, subroutines and typeglobs), and you said something
108like C<*foo * foo> that might be interpreted as either of them. We
109assumed you meant the infix operator, but please try to make it more
110clear -- in the example given, you might write C<*foo * foo()> if you
111really meant to multiply a glob by the result of calling a function.
d8225693 112
1ef43bca
JM
113=item Ambiguous use of %c{%s} resolved to %c%s
114
115(W ambiguous) You wrote something like C<@{foo}>, which might be
116asking for the variable C<@foo>, or it might be calling a function
117named foo, and dereferencing it as an array reference. If you wanted
118the varable, you can just write C<@foo>. If you wanted to call the
119function, write C<@{foo()}> ... or you could just not have a variable
120and a function with the same name, and save yourself a lot of trouble.
121
e850844c
FC
122=item Ambiguous use of %c{%s[...]} resolved to %c%s[...]
123
124=item Ambiguous use of %c{%s{...}} resolved to %c%s{...}
4da60377 125
ccaaf480
FC
126(W ambiguous) You wrote something like C<${foo[2]}> (where foo
127represents the name of a Perl keyword), which might be looking for
128element number 2 of the array named C<@foo>, in which case please write
129C<$foo[2]>, or you might have meant to pass an anonymous arrayref to
130the function named foo, and then do a scalar deref on the value it
131returns. If you meant that, write C<${foo([2])}>.
132
133In regular expressions, the C<${foo[2]}> syntax is sometimes necessary
134to disambiguate between array subscripts and character classes.
135C</$length[2345]/>, for instance, will be interpreted as C<$length>
136followed by the character class C<[2345]>. If an array subscript is what
137you want, you can avoid the warning by changing C</${length[2345]}/>
138to the unsightly C</${\$length[2345]}/>, by renaming your array to
139something that does not coincide with a built-in keyword, or by
140simply turning off warnings with C<no warnings 'ambiguous';>.
4da60377 141
bdac9d71 142=item Ambiguous use of -%s resolved as -&%s()
397d0f13
JM
143
144(W ambiguous) You wrote something like C<-foo>, which might be the
a7f6e211
FC
145string C<"-foo">, or a call to the function C<foo>, negated. If you meant
146the string, just write C<"-foo">. If you meant the function call,
397d0f13
JM
147write C<-foo()>.
148
6df41af2 149=item '|' and '<' may not both be specified on command line
a0d0e21e 150
be771a83
GS
151(F) An error peculiar to VMS. Perl does its own command line
152redirection, and found that STDIN was a pipe, and that you also tried to
153redirect STDIN using '<'. Only one STDIN stream to a customer, please.
c9f97d15 154
6df41af2 155=item '|' and '>' may not both be specified on command line
1028017a 156
be771a83
GS
157(F) An error peculiar to VMS. Perl does its own command line
158redirection, and thinks you tried to redirect stdout both to a file and
159into a pipe to another command. You need to choose one or the other,
160though nothing's stopping you from piping into a program or Perl script
161which 'splits' output into two streams, such as
1028017a 162
6df41af2
GS
163 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
164 while (<STDIN>) {
165 print;
166 print OUT;
167 }
168 close OUT;
c9f97d15 169
6df41af2 170=item Applying %s to %s will act on scalar(%s)
eb6e2d6f 171
496a33f5
SC
172(W misc) The pattern match (C<//>), substitution (C<s///>), and
173transliteration (C<tr///>) operators work on scalar values. If you apply
be771a83 174one of them to an array or a hash, it will convert the array or hash to
ac036724 175a scalar value (the length of an array, or the population info of a
176hash) and then work on that scalar value. This is probably not what
be771a83
GS
177you meant to do. See L<perlfunc/grep> and L<perlfunc/map> for
178alternatives.
eb6e2d6f 179
6df41af2 180=item Arg too short for msgsnd
76cd736e 181
6df41af2 182(F) msgsnd() requires a string at least as long as sizeof(long).
76cd736e 183
b0fdf69e 184=item %s argument is not a HASH or ARRAY element or a subroutine
a0d0e21e 185
cc1c2e42
FC
186(F) The argument to exists() must be a hash or array element or a
187subroutine with an ampersand, such as:
a0d0e21e
LW
188
189 $foo{$bar}
cb4f522a 190 $ref->{"susie"}[12]
cc1c2e42 191 &do_something
a0d0e21e 192
8ea97a1e 193=item %s argument is not a HASH or ARRAY element or slice
5f05dabc 194
06e52bfa
FC
195(F) The argument to delete() must be either a hash or array element,
196such as:
5f05dabc
PP
197
198 $foo{$bar}
cb4f522a 199 $ref->{"susie"}[12]
5f05dabc 200
8ea97a1e 201or a hash or array slice, such as:
5f05dabc 202
6df41af2
GS
203 @foo[$bar, $baz, $xyzzy]
204 @{$ref->[12]}{"susie", "queue"}
5315574d 205
6df41af2 206=item %s argument is not a subroutine name
a0d0e21e 207
6df41af2 208(F) The argument to exists() for C<exists &sub> must be a subroutine
be771a83
GS
209name, and not a subroutine call. C<exists &sub()> will generate this
210error.
a0d0e21e 211
f86702cc 212=item Argument "%s" isn't numeric%s
a0d0e21e 213
be771a83
GS
214(W numeric) The indicated string was fed as an argument to an operator
215that expected a numeric value instead. If you're fortunate the message
216will identify which operator was so unfortunate.
a0d0e21e 217
b4581f09
JH
218=item Argument list not closed for PerlIO layer "%s"
219
220(W layer) When pushing a layer with arguments onto the Perl I/O system you
221forgot the ) that closes the argument list. (Layers take care of transforming
222data between external and internal representations.) Perl stopped parsing
223the layer list at this point and did not attempt to push this layer.
224If your program didn't explicitly request the failing operation, it may be
225the result of the value of the environment variable PERLIO.
226
a0d0e21e
LW
227=item Array @%s missing the @ in argument %d of %s()
228
75b44862
GS
229(D deprecated) Really old Perl let you omit the @ on array names in some
230spots. This is now heavily deprecated.
a0d0e21e
LW
231
232=item assertion botched: %s
233
234(P) The malloc package that comes with Perl had an internal failure.
235
236=item Assertion failed: file "%s"
237
238(P) A general assertion failed. The file in question must be examined.
239
240=item Assignment to both a list and a scalar
241
242(F) If you assign to a conditional operator, the 2nd and 3rd arguments
243must either both be scalars or both be lists. Otherwise Perl won't
244know which context to supply to the right side.
245
96ebfdd7
RK
246=item A thread exited while %d threads were running
247
4447dfc1 248(W threads)(S) When using threaded Perl, a thread (not necessarily the main
96ebfdd7 249thread) exited while there were still other threads running.
111a855e
FC
250Usually it's a good idea first to collect the return values of the
251created threads by joining them, and only then to exit from the main
96ebfdd7
RK
252thread. See L<threads>.
253
2393f1b9 254=item Attempt to access disallowed key '%s' in a restricted hash
1b1f1335 255
49293501 256(F) The failing code has attempted to get or set a key which is not in
2393f1b9 257the current set of allowed keys of a restricted hash.
49293501 258
81689caa
HS
259=item Attempt to bless into a reference
260
261(F) The CLASSNAME argument to the bless() operator is expected to be
262the name of the package to bless the resulting object into. You've
263supplied instead a reference to something: perhaps you wrote
264
265 bless $self, $proto;
266
267when you intended
268
269 bless $self, ref($proto) || $proto;
270
271If you actually want to bless into the stringified version
272of the reference supplied, you need to stringify it yourself, for
273example by:
274
275 bless $self, "$proto";
276
96ebfdd7
RK
277=item Attempt to delete disallowed key '%s' from a restricted hash
278
279(F) The failing code attempted to delete from a restricted hash a key
280which is not in its key set.
281
282=item Attempt to delete readonly key '%s' from a restricted hash
283
284(F) The failing code attempted to delete a key whose value has been
285declared readonly from a restricted hash.
286
de42a5a9 287=item Attempt to free non-arena SV: 0x%x
a0d0e21e 288
be771a83
GS
289(P internal) All SV objects are supposed to be allocated from arenas
290that will be garbage collected on exit. An SV was discovered to be
291outside any of those arenas.
a0d0e21e 292
54310121 293=item Attempt to free nonexistent shared string
bbce6d69 294
111a855e 295(P internal) Perl maintains a reference-counted internal table of
be771a83
GS
296strings to optimize the storage and access of hash keys and other
297strings. This indicates someone tried to decrement the reference count
298of a string that can no longer be found in the table.
bbce6d69 299
a0d0e21e
LW
300=item Attempt to free temp prematurely
301
be771a83
GS
302(W debugging) Mortalized values are supposed to be freed by the
303free_tmps() routine. This indicates that something else is freeing the
304SV before the free_tmps() routine gets a chance, which means that the
305free_tmps() routine will be freeing an unreferenced scalar when it does
306try to free it.
a0d0e21e
LW
307
308=item Attempt to free unreferenced glob pointers
309
e476b1b5 310(P internal) The reference counts got screwed up on symbol aliases.
a0d0e21e
LW
311
312=item Attempt to free unreferenced scalar
313
be771a83
GS
314(W internal) Perl went to decrement the reference count of a scalar to
315see if it would go to 0, and discovered that it had already gone to 0
316earlier, and should have been freed, and in fact, probably was freed.
317This could indicate that SvREFCNT_dec() was called too many times, or
318that SvREFCNT_inc() was called too few times, or that the SV was
319mortalized when it shouldn't have been, or that memory has been
320corrupted.
a0d0e21e 321
dcdda58d
GS
322=item Attempt to join self
323
324(F) You tried to join a thread from within itself, which is an
be771a83
GS
325impossible task. You may be joining the wrong thread, or you may need
326to move the join() to some other thread.
dcdda58d 327
84902520
TB
328=item Attempt to pack pointer to temporary value
329
be771a83
GS
330(W pack) You tried to pass a temporary value (like the result of a
331function, or a computed expression) to the "p" pack() template. This
332means the result contains a pointer to a location that could become
333invalid anytime, even before the end of the current statement. Use
334literals or global values as arguments to the "p" pack() template to
335avoid this warning.
84902520 336
087b5369
RD
337=item Attempt to reload %s aborted.
338
339(F) You tried to load a file with C<use> or C<require> that failed to
340compile once already. Perl will not try to compile this file again
341unless you delete its entry from %INC. See L<perlfunc/require> and
342L<perlvar/%INC>.
343
1b20cd17
NC
344=item Attempt to set length of freed array
345
346(W) You tried to set the length of an array which has been freed. You
347can do this by storing a reference to the scalar representing the last index
348of an array and later assigning through that reference. For example
349
350 $r = do {my @a; \$#a};
351 $$r = 503
352
b7a902f4
PP
353=item Attempt to use reference as lvalue in substr
354
be771a83
GS
355(W substr) You supplied a reference as the first argument to substr()
356used as an lvalue, which is pretty strange. Perhaps you forgot to
357dereference it first. See L<perlfunc/substr>.
b7a902f4 358
c32124fe
NC
359=item Attribute "locked" is deprecated
360
111a855e 361(D deprecated) You have used the attributes pragma to modify the "locked"
c32124fe 362attribute on a code reference. The :locked attribute is obsolete, has had no
a5547419 363effect since 5005 threads were removed, and will be removed in a future
c32124fe
NC
364release of Perl 5.
365
f1a3ce43
NC
366=item Attribute "unique" is deprecated
367
111a855e 368(D deprecated) You have used the attributes pragma to modify the "unique"
b7a2910f 369attribute on an array, hash or scalar reference. The :unique attribute has
a5547419
FC
370had no effect since Perl 5.8.8, and will be removed in a future release
371of Perl 5.
f1a3ce43 372
de42a5a9 373=item Bad arg length for %s, is %u, should be %d
a0d0e21e 374
be771a83
GS
375(F) You passed a buffer of the wrong size to one of msgctl(), semctl()
376or shmctl(). In C parlance, the correct sizes are, respectively,
5f05dabc 377S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and
a0d0e21e
LW
378S<sizeof(struct shmid_ds *)>.
379
7a95317d
GS
380=item Bad evalled substitution pattern
381
496a33f5 382(F) You've used the C</e> switch to evaluate the replacement for a
7a95317d
GS
383substitution, but perl found a syntax error in the code to evaluate,
384most likely an unexpected right brace '}'.
385
a0d0e21e
LW
386=item Bad filehandle: %s
387
be771a83
GS
388(F) A symbol was passed to something wanting a filehandle, but the
389symbol has no filehandle associated with it. Perhaps you didn't do an
390open(), or did it in another package.
a0d0e21e
LW
391
392=item Bad free() ignored
393
be771a83
GS
394(S malloc) An internal routine called free() on something that had never
395been malloc()ed in the first place. Mandatory, but can be disabled by
9ea8bc6d 396setting environment variable C<PERL_BADFREE> to 0.
33c8a3fe 397
9ea8bc6d 398This message can be seen quite often with DB_File on systems with "hard"
be771a83
GS
399dynamic linking, like C<AIX> and C<OS/2>. It is a bug of C<Berkeley DB>
400which is left unnoticed if C<DB> uses I<forgiving> system malloc().
a0d0e21e 401
aa689395
PP
402=item Bad hash
403
404(P) One of the internal hash routines was passed a null HV pointer.
405
6df41af2
GS
406=item Badly placed ()'s
407
408(A) You've accidentally run your script through B<csh> instead
409of Perl. Check the #! line, or manually feed your script into
410Perl yourself.
411
a0d0e21e
LW
412=item Bad name after %s::
413
be771a83
GS
414(F) You started to name a symbol by using a package prefix, and then
415didn't finish the symbol. In particular, you can't interpolate outside
416of quotes, so
a0d0e21e
LW
417
418 $var = 'myvar';
419 $sym = mypack::$var;
420
421is not the same as
422
423 $var = 'myvar';
424 $sym = "mypack::$var";
425
88e1f1a2
JV
426=item Bad plugin affecting keyword '%s'
427
428(F) An extension using the keyword plugin mechanism violated the
429plugin API.
430
4ad56ec9
IZ
431=item Bad realloc() ignored
432
be771a83
GS
433(S malloc) An internal routine called realloc() on something that had
434never been malloc()ed in the first place. Mandatory, but can be disabled
4dcecea4 435by setting the environment variable C<PERL_BADFREE> to 1.
4ad56ec9 436
a0d0e21e
LW
437=item Bad symbol for array
438
439(P) An internal request asked to add an array entry to something that
440wasn't a symbol table entry.
441
4df3f177
SP
442=item Bad symbol for dirhandle
443
444(P) An internal request asked to add a dirhandle entry to something
445that wasn't a symbol table entry.
446
447
a0d0e21e
LW
448=item Bad symbol for filehandle
449
be771a83
GS
450(P) An internal request asked to add a filehandle entry to something
451that wasn't a symbol table entry.
a0d0e21e
LW
452
453=item Bad symbol for hash
454
455(P) An internal request asked to add a hash entry to something that
456wasn't a symbol table entry.
457
34d09196
GS
458=item Bareword found in conditional
459
be771a83
GS
460(W bareword) The compiler found a bareword where it expected a
461conditional, which often indicates that an || or && was parsed as part
462of the last argument of the previous construct, for example:
34d09196
GS
463
464 open FOO || die;
465
be771a83
GS
466It may also indicate a misspelled constant that has been interpreted as
467a bareword:
34d09196
GS
468
469 use constant TYPO => 1;
470 if (TYOP) { print "foo" }
471
472The C<strict> pragma is useful in avoiding such errors.
473
6df41af2
GS
474=item Bareword "%s" not allowed while "strict subs" in use
475
476(F) With "strict subs" in use, a bareword is only allowed as a
be771a83
GS
477subroutine identifier, in curly brackets or to the left of the "=>"
478symbol. Perhaps you need to predeclare a subroutine?
6df41af2
GS
479
480=item Bareword "%s" refers to nonexistent package
481
be771a83
GS
482(W bareword) You used a qualified bareword of the form C<Foo::>, but the
483compiler saw no other uses of that namespace before that point. Perhaps
484you need to predeclare a package?
6df41af2 485
a0d0e21e
LW
486=item BEGIN failed--compilation aborted
487
be771a83
GS
488(F) An untrapped exception was raised while executing a BEGIN
489subroutine. Compilation stops immediately and the interpreter is
490exited.
a0d0e21e 491
68dc0745
PP
492=item BEGIN not safe after errors--compilation aborted
493
494(F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which
be771a83
GS
495implies a C<BEGIN {}>) after one or more compilation errors had already
496occurred. Since the intended environment for the C<BEGIN {}> could not
497be guaranteed (due to the errors), and since subsequent code likely
498depends on its correct operation, Perl just gave up.
68dc0745 499
6df41af2
GS
500=item \1 better written as $1
501
be771a83
GS
502(W syntax) Outside of patterns, backreferences live on as variables.
503The use of backslashes is grandfathered on the right-hand side of a
504substitution, but stylistically it's better to use the variable form
505because other Perl programmers will expect it, and it works better if
506there are more than 9 backreferences.
6df41af2 507
252aa082
JH
508=item Binary number > 0b11111111111111111111111111111111 non-portable
509
e476b1b5 510(W portable) The binary number you specified is larger than 2**32-1
9e24b6e2
JH
511(4294967295) and therefore non-portable between systems. See
512L<perlport> for more on portability concerns.
252aa082 513
69282e91 514=item bind() on closed socket %s
a0d0e21e 515
be771a83
GS
516(W closed) You tried to do a bind on a closed socket. Did you forget to
517check the return value of your socket() call? See L<perlfunc/bind>.
a0d0e21e 518
c289d2f7
JH
519=item binmode() on closed filehandle %s
520
521(W unopened) You tried binmode() on a filehandle that was never opened.
4dcecea4 522Check your control flow and number of arguments.
c289d2f7 523
f866a7cd
FC
524=item "\b{" is deprecated; use "\b\{" instead
525
526=item "\B{" is deprecated; use "\B\{" instead
527
528(W deprecated, regexp) Use of an unescaped "{" immediately following a
529C<\b> or C<\B> is now deprecated so as to reserve its use for Perl
530itself in a future release.
531
c5a0f51a
JH
532=item Bit vector size > 32 non-portable
533
e476b1b5 534(W portable) Using bit vector sizes larger than 32 is non-portable.
c5a0f51a 535
4633a7c4
LW
536=item Bizarre copy of %s in %s
537
be771a83 538(P) Perl detected an attempt to copy an internal value that is not
4dcecea4 539copiable.
4633a7c4 540
f675dbe5
CB
541=item Buffer overflow in prime_env_iter: %s
542
be771a83
GS
543(W internal) A warning peculiar to VMS. While Perl was preparing to
544iterate over %ENV, it encountered a logical name or symbol definition
545which was too long, so it was truncated to the string shown.
f675dbe5 546
a0d0e21e
LW
547=item Callback called exit
548
4929bf7b 549(F) A subroutine invoked from an external package via call_sv()
a0d0e21e
LW
550exited by calling exit.
551
6df41af2 552=item %s() called too early to check prototype
f675dbe5 553
be771a83
GS
554(W prototype) You've called a function that has a prototype before the
555parser saw a definition or declaration for it, and Perl could not check
556that the call conforms to the prototype. You need to either add an
557early prototype declaration for the subroutine in question, or move the
558subroutine definition ahead of the call to get proper prototype
559checking. Alternatively, if you are certain that you're calling the
560function correctly, you may put an ampersand before the name to avoid
561the warning. See L<perlsub>.
f675dbe5 562
49704364 563=item Cannot compress integer in pack
0258719b
NC
564
565(F) An argument to pack("w",...) was too large to compress. The BER
566compressed integer format can only be used with positive integers, and you
567attempted to compress Infinity or a very large number (> 1e308).
568See L<perlfunc/pack>.
569
49704364 570=item Cannot compress negative numbers in pack
0258719b
NC
571
572(F) An argument to pack("w",...) was negative. The BER compressed integer
573format can only be used with positive integers. See L<perlfunc/pack>.
574
5c1f4d79
NC
575=item Cannot convert a reference to %s to typeglob
576
577(F) You manipulated Perl's symbol table directly, stored a reference in it,
578then tried to access that symbol via conventional Perl syntax. The access
579triggers Perl to autovivify that typeglob, but it there is no legal conversion
580from that type of reference to a typeglob.
581
ba2fdce6
NC
582=item Cannot copy to %s in %s
583
584(P) Perl detected an attempt to copy a value to an internal type that cannot
4dcecea4 585be directly assigned to.
ba2fdce6 586
b5d97229
RGS
587=item Cannot find encoding "%s"
588
589(S io) You tried to apply an encoding that did not exist to a filehandle,
590either with open() or binmode().
591
96ebfdd7
RK
592=item Can only compress unsigned integers in pack
593
594(F) An argument to pack("w",...) was not an integer. The BER compressed
595integer format can only be used with positive integers, and you attempted
596to compress something else. See L<perlfunc/pack>.
597
a0d0e21e
LW
598=item Can't bless non-reference value
599
600(F) Only hard references may be blessed. This is how Perl "enforces"
601encapsulation of objects. See L<perlobj>.
602
dc57907a
RGS
603=item Can't "break" in a loop topicalizer
604
0d863452
RH
605(F) You called C<break>, but you're in a C<foreach> block rather than
606a C<given> block. You probably meant to use C<next> or C<last>.
607
608=item Can't "break" outside a given block
dc57907a 609
0d863452
RH
610(F) You called C<break>, but you're not inside a C<given> block.
611
6df41af2
GS
612=item Can't call method "%s" on an undefined value
613
614(F) You used the syntax of a method call, but the slot filled by the
be771a83
GS
615object reference or package name contains an undefined value. Something
616like this will reproduce the error:
6df41af2
GS
617
618 $BADREF = undef;
619 process $BADREF 1,2,3;
620 $BADREF->process(1,2,3);
621
a0d0e21e
LW
622=item Can't call method "%s" on unblessed reference
623
54310121 624(F) A method call must know in what package it's supposed to run. It
be771a83
GS
625ordinarily finds this out from the object reference you supply, but you
626didn't supply an object reference in this case. A reference isn't an
627object reference until it has been blessed. See L<perlobj>.
a0d0e21e
LW
628
629=item Can't call method "%s" without a package or object reference
630
631(F) You used the syntax of a method call, but the slot filled by the
be771a83
GS
632object reference or package name contains an expression that returns a
633defined value which is neither an object reference nor a package name.
72b5445b
GS
634Something like this will reproduce the error:
635
636 $BADREF = 42;
637 process $BADREF 1,2,3;
638 $BADREF->process(1,2,3);
639
a0d0e21e
LW
640=item Can't chdir to %s
641
642(F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
643that you can chdir to, possibly because it doesn't exist.
644
0545a864 645=item Can't check filesystem of script "%s" for nosuid
104d25b7 646
be771a83
GS
647(P) For some reason you can't check the filesystem of the script for
648nosuid.
104d25b7 649
22e74366 650=item Can't coerce %s to %s in %s
a0d0e21e
LW
651
652(F) Certain types of SVs, in particular real symbol table entries
55497cff 653(typeglobs), can't be forced to stop being what they are. So you can't
a0d0e21e
LW
654say things like:
655
656 *foo += 1;
657
658You CAN say
659
660 $foo = *foo;
661 $foo += 1;
662
663but then $foo no longer contains a glob.
664
0d863452 665=item Can't "continue" outside a when block
dc57907a 666
0d863452
RH
667(F) You called C<continue>, but you're not inside a C<when>
668or C<default> block.
669
a0d0e21e
LW
670=item Can't create pipe mailbox
671
be771a83
GS
672(P) An error peculiar to VMS. The process is suffering from exhausted
673quotas or other plumbing problems.
a0d0e21e 674
eb64745e
GS
675=item Can't declare %s in "%s"
676
30c282f6
NC
677(F) Only scalar, array, and hash variables may be declared as "my", "our" or
678"state" variables. They must have ordinary identifiers as names.
a0d0e21e 679
6df41af2
GS
680=item Can't do inplace edit: %s is not a regular file
681
be771a83
GS
682(S inplace) You tried to use the B<-i> switch on a special file, such as
683a file in /dev, or a FIFO. The file was ignored.
6df41af2 684
a0d0e21e
LW
685=item Can't do inplace edit on %s: %s
686
be771a83
GS
687(S inplace) The creation of the new file failed for the indicated
688reason.
a0d0e21e 689
54310121 690=item Can't do inplace edit without backup
a0d0e21e 691
be771a83
GS
692(F) You're on a system such as MS-DOS that gets confused if you try
693reading from a deleted (but still opened) file. You have to say
694C<-i.bak>, or some such.
a0d0e21e 695
10f9c03d 696=item Can't do inplace edit: %s would not be unique
a0d0e21e 697
e476b1b5 698(S inplace) Your filesystem does not support filenames longer than 14
10f9c03d
CK
699characters and Perl was unable to create a unique filename during
700inplace editing with the B<-i> switch. The file was ignored.
a0d0e21e 701
7253e4e3 702=item Can't do {n,m} with n > m in regex; marked by <-- HERE in m/%s/
a0d0e21e 703
b45f050a 704(F) Minima must be less than or equal to maxima. If you really want your
7253e4e3 705regexp to match something 0 times, just put {0}. The <-- HERE shows in the
b45f050a 706regular expression about where the problem was discovered. See L<perlre>.
a0d0e21e 707
a0d0e21e
LW
708=item Can't do waitpid with flags
709
be771a83
GS
710(F) This machine doesn't have either waitpid() or wait4(), so only
711waitpid() without flags is emulated.
a0d0e21e 712
a0d0e21e
LW
713=item Can't emulate -%s on #! line
714
be771a83
GS
715(F) The #! line specifies a switch that doesn't make sense at this
716point. For example, it'd be kind of silly to put a B<-x> on the #!
717line.
a0d0e21e 718
1109a392
MHM
719=item Can't %s %s-endian %ss on this platform
720
721(F) Your platform's byte-order is neither big-endian nor little-endian,
722or it has a very strange pointer size. Packing and unpacking big- or
723little-endian floating point values and pointers may not be possible.
724See L<perlfunc/pack>.
725
a0d0e21e
LW
726=item Can't exec "%s": %s
727
d1be9408 728(W exec) A system(), exec(), or piped open call could not execute the
be771a83
GS
729named program for the indicated reason. Typical reasons include: the
730permissions were wrong on the file, the file wasn't found in
731C<$ENV{PATH}>, the executable in question was compiled for another
732architecture, or the #! line in a script points to an interpreter that
733can't be run for similar reasons. (Or maybe your system doesn't support
734#! at all.)
a0d0e21e
LW
735
736=item Can't exec %s
737
be771a83
GS
738(F) Perl was trying to execute the indicated program for you because
739that's what the #! line said. If that's not what you wanted, you may
740need to mention "perl" on the #! line somewhere.
a0d0e21e
LW
741
742=item Can't execute %s
743
be771a83
GS
744(F) You used the B<-S> switch, but the copies of the script to execute
745found in the PATH did not have correct permissions.
2a92aaa0 746
6df41af2 747=item Can't find an opnumber for "%s"
2a92aaa0 748
be771a83
GS
749(F) A string of a form C<CORE::word> was given to prototype(), but there
750is no builtin with the name C<word>.
6df41af2 751
56ca2fc0
JH
752=item Can't find %s character property "%s"
753
754(F) You used C<\p{}> or C<\P{}> but the character property by that name
e1b711da
KW
755could not be found. Maybe you misspelled the name of the property?
756See L<perluniprops/Properties accessible through \p{} and \P{}>
757for a complete list of available properties.
56ca2fc0 758
6df41af2
GS
759=item Can't find label %s
760
be771a83
GS
761(F) You said to goto a label that isn't mentioned anywhere that it's
762possible for us to go to. See L<perlfunc/goto>.
2a92aaa0
GS
763
764=item Can't find %s on PATH
765
be771a83
GS
766(F) You used the B<-S> switch, but the script to execute could not be
767found in the PATH.
a0d0e21e 768
6df41af2 769=item Can't find %s on PATH, '.' not in PATH
a0d0e21e 770
be771a83
GS
771(F) You used the B<-S> switch, but the script to execute could not be
772found in the PATH, or at least not with the correct permissions. The
773script exists in the current directory, but PATH prohibits running it.
a0d0e21e
LW
774
775=item Can't find string terminator %s anywhere before EOF
776
be771a83
GS
777(F) Perl strings can stretch over multiple lines. This message means
778that the closing delimiter was omitted. Because bracketed quotes count
779nesting levels, the following is missing its final parenthesis:
a0d0e21e 780
fb73857a
PP
781 print q(The character '(' starts a side comment.);
782
be771a83
GS
783If you're getting this error from a here-document, you may have included
784unseen whitespace before or after your closing tag. A good programmer's
785editor will have a way to help you find these characters.
a0d0e21e 786
660a4616
ST
787=item Can't find Unicode property definition "%s"
788
5f8ad6b6
FC
789(F) You may have tried to use C<\p> which means a Unicode
790property (for example C<\p{Lu}> matches all uppercase
791letters). If you did mean to use a Unicode property, see
e1b711da 792L<perluniprops/Properties accessible through \p{} and \P{}>
5f8ad6b6
FC
793for a complete list of available properties. If you didn't
794mean to use a Unicode property, escape the C<\p>, either by C<\\p>
795(just the C<\p>) or by C<\Q\p> (the rest of the string, or
796until C<\E>).
660a4616 797
b3647a36 798=item Can't fork: %s
a0d0e21e 799
be771a83
GS
800(F) A fatal error occurred while trying to fork while opening a
801pipeline.
a0d0e21e 802
b3647a36
SR
803=item Can't fork, trying again in 5 seconds
804
c973c02e 805(W pipe) A fork in a piped open failed with EAGAIN and will be retried
b3647a36
SR
806after five seconds.
807
748a9306
LW
808=item Can't get filespec - stale stat buffer?
809
be771a83
GS
810(S) A warning peculiar to VMS. This arises because of the difference
811between access checks under VMS and under the Unix model Perl assumes.
812Under VMS, access checks are done by filename, rather than by bits in
813the stat buffer, so that ACLs and other protections can be taken into
814account. Unfortunately, Perl assumes that the stat buffer contains all
815the necessary information, and passes it, instead of the filespec, to
2fe2bdfd 816the access-checking routine. It will try to retrieve the filespec using
be771a83
GS
817the device name and FID present in the stat buffer, but this works only
818if you haven't made a subsequent call to the CRTL stat() routine,
819because the device name is overwritten with each call. If this warning
2fe2bdfd
FC
820appears, the name lookup failed, and the access-checking routine gave up
821and returned FALSE, just to be conservative. (Note: The access-checking
be771a83
GS
822routine knows about the Perl C<stat> operator and file tests, so you
823shouldn't ever see this warning in response to a Perl command; it arises
824only if some internal code takes stat buffers lightly.)
748a9306 825
a0d0e21e
LW
826=item Can't get pipe mailbox device name
827
be771a83
GS
828(P) An error peculiar to VMS. After creating a mailbox to act as a
829pipe, Perl can't retrieve its name for later use.
a0d0e21e
LW
830
831=item Can't get SYSGEN parameter value for MAXBUF
832
748a9306
LW
833(P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
834mailbox buffers to be, and didn't get an answer.
a0d0e21e 835
6df41af2 836=item Can't "goto" into the middle of a foreach loop
a0d0e21e 837
be771a83
GS
838(F) A "goto" statement was executed to jump into the middle of a foreach
839loop. You can't get there from here. See L<perlfunc/goto>.
6df41af2
GS
840
841=item Can't "goto" out of a pseudo block
842
be771a83
GS
843(F) A "goto" statement was executed to jump out of what might look like
844a block, except that it isn't a proper block. This usually occurs if
845you tried to jump out of a sort() block or subroutine, which is a no-no.
846See L<perlfunc/goto>.
a0d0e21e 847
9850bf21 848=item Can't goto subroutine from a sort sub (or similar callback)
cd299c6e 849
9850bf21
RH
850(F) The "goto subroutine" call can't be used to jump out of the
851comparison sub for a sort(), or from a similar callback (such
852as the reduce() function in List::Util).
853
c74ace89 854=item Can't goto subroutine from an eval-%s
b150fb22 855
be771a83 856(F) The "goto subroutine" call can't be used to jump out of an eval
c74ace89 857"string" or block.
b150fb22 858
6df41af2
GS
859=item Can't goto subroutine outside a subroutine
860
be771a83
GS
861(F) The deeply magical "goto subroutine" call can only replace one
862subroutine call for another. It can't manufacture one out of whole
863cloth. In general you should be calling it out of only an AUTOLOAD
864routine anyway. See L<perlfunc/goto>.
6df41af2 865
0b5b802d
GS
866=item Can't ignore signal CHLD, forcing to default
867
be771a83
GS
868(W signal) Perl has detected that it is being run with the SIGCHLD
869signal (sometimes known as SIGCLD) disabled. Since disabling this
870signal will interfere with proper determination of exit status of child
871processes, Perl has reset the signal to its default value. This
872situation typically indicates that the parent program under which Perl
873may be running (e.g. cron) is being very careless.
0b5b802d 874
e2c0f81f
DG
875=item Can't kill a non-numeric process ID
876
877(F) Process identifiers must be (signed) integers. It is a fatal error to
878attempt to kill() an undefined, empty-string or otherwise non-numeric
879process identifier.
880
6df41af2 881=item Can't "last" outside a loop block
4633a7c4 882
6df41af2 883(F) A "last" statement was executed to break out of the current block,
be771a83
GS
884except that there's this itty bitty problem called there isn't a current
885block. Note that an "if" or "else" block doesn't count as a "loopish"
886block, as doesn't a block given to sort(), map() or grep(). You can
887usually double the curlies to get the same effect though, because the
888inner curlies will be considered a block that loops once. See
889L<perlfunc/last>.
4633a7c4 890
2c7d6b9c
RGS
891=item Can't linearize anonymous symbol table
892
893(F) Perl tried to calculate the method resolution order (MRO) of a
894package, but failed because the package stash has no name.
895
b8170e59
JB
896=item Can't load '%s' for module %s
897
898(F) The module you tried to load failed to load a dynamic extension. This
899may either mean that you upgraded your version of perl to one that is
900incompatible with your old dynamic extensions (which is known to happen
901between major versions of perl), or (more likely) that your dynamic
16d98ec5 902extension was built against an older version of the library that is
b8170e59
JB
903installed on your system. You may need to rebuild your old dynamic
904extensions.
905
748a9306
LW
906=item Can't localize lexical variable %s
907
2ba9eb46 908(F) You used local on a variable name that was previously declared as a
30c282f6 909lexical variable using "my" or "state". This is not allowed. If you want to
748a9306
LW
910localize a package variable of the same name, qualify it with the
911package name.
912
6df41af2 913=item Can't localize through a reference
4727527e 914
6df41af2
GS
915(F) You said something like C<local $$ref>, which Perl can't currently
916handle, because when it goes to restore the old value of whatever $ref
be771a83 917pointed to after the scope of the local() is finished, it can't be sure
64977eb6 918that $ref will still be a reference.
4727527e 919
ea071790 920=item Can't locate %s
ec889f3a
GS
921
922(F) You said to C<do> (or C<require>, or C<use>) a file that couldn't be
923found. Perl looks for the file in all the locations mentioned in @INC,
be771a83
GS
924unless the file name included the full path to the file. Perhaps you
925need to set the PERL5LIB or PERL5OPT environment variable to say where
926the extra library is, or maybe the script needs to add the library name
927to @INC. Or maybe you just misspelled the name of the file. See
928L<perlfunc/require> and L<lib>.
a0d0e21e 929
6df41af2
GS
930=item Can't locate auto/%s.al in @INC
931
be771a83
GS
932(F) A function (or method) was called in a package which allows
933autoload, but there is no function to autoload. Most probable causes
934are a misprint in a function/method name or a failure to C<AutoSplit>
935the file, say, by doing C<make install>.
6df41af2 936
b8170e59
JB
937=item Can't locate loadable object for module %s in @INC
938
939(F) The module you loaded is trying to load an external library, like
940for example, C<foo.so> or C<bar.dll>, but the L<DynaLoader> module was
941unable to locate this library. See L<DynaLoader>.
942
a0d0e21e
LW
943=item Can't locate object method "%s" via package "%s"
944
945(F) You called a method correctly, and it correctly indicated a package
946functioning as a class, but that package doesn't define that particular
2ba9eb46 947method, nor does any of its base classes. See L<perlobj>.
a0d0e21e
LW
948
949=item Can't locate package %s for @%s::ISA
950
be771a83
GS
951(W syntax) The @ISA array contained the name of another package that
952doesn't seem to exist.
a0d0e21e 953
2f7da168
RK
954=item Can't locate PerlIO%s
955
956(F) You tried to use in open() a PerlIO layer that does not exist,
957e.g. open(FH, ">:nosuchlayer", "somefile").
958
3e3baf6d
TB
959=item Can't make list assignment to \%ENV on this system
960
be771a83
GS
961(F) List assignment to %ENV is not supported on some systems, notably
962VMS.
3e3baf6d 963
a0d0e21e
LW
964=item Can't modify %s in %s
965
be771a83
GS
966(F) You aren't allowed to assign to the item indicated, or otherwise try
967to change it, such as with an auto-increment.
a0d0e21e 968
54310121 969=item Can't modify nonexistent substring
a0d0e21e
LW
970
971(P) The internal routine that does assignment to a substr() was handed
972a NULL.
973
6df41af2
GS
974=item Can't modify non-lvalue subroutine call
975
976(F) Subroutines meant to be used in lvalue context should be declared as
2fe2bdfd 977such. See L<perlsub/"Lvalue subroutines">.
6df41af2 978
5f05dabc 979=item Can't msgrcv to read-only var
a0d0e21e 980
5f05dabc 981(F) The target of a msgrcv must be modifiable to be used as a receive
a0d0e21e
LW
982buffer.
983
6df41af2
GS
984=item Can't "next" outside a loop block
985
986(F) A "next" statement was executed to reiterate the current block, but
987there isn't a current block. Note that an "if" or "else" block doesn't
be771a83
GS
988count as a "loopish" block, as doesn't a block given to sort(), map() or
989grep(). You can usually double the curlies to get the same effect
990though, because the inner curlies will be considered a block that loops
991once. See L<perlfunc/next>.
6df41af2 992
a0d0e21e
LW
993=item Can't open %s: %s
994
c47ff5f1 995(S inplace) The implicit opening of a file through use of the C<< <> >>
08e9d68e
DD
996filehandle, either implicitly under the C<-n> or C<-p> command-line
997switches, or explicitly, failed for the indicated reason. Usually this
be771a83
GS
998is because you don't have read permission for a file which you named on
999the command line.
a0d0e21e 1000
9a869a14
RGS
1001=item Can't open a reference
1002
1003(W io) You tried to open a scalar reference for reading or writing,
2fe2bdfd 1004using the 3-arg open() syntax:
9a869a14
RGS
1005
1006 open FH, '>', $ref;
1007
1008but your version of perl is compiled without perlio, and this form of
1009open is not supported.
1010
a0d0e21e
LW
1011=item Can't open bidirectional pipe
1012
be771a83
GS
1013(W pipe) You tried to say C<open(CMD, "|cmd|")>, which is not supported.
1014You can try any of several modules in the Perl library to do this, such
1015as IPC::Open2. Alternately, direct the pipe's output to a file using
1016">", and then read it in under a different file handle.
a0d0e21e 1017
748a9306
LW
1018=item Can't open error file %s as stderr
1019
be771a83
GS
1020(F) An error peculiar to VMS. Perl does its own command line
1021redirection, and couldn't open the file specified after '2>' or '2>>' on
1022the command line for writing.
748a9306
LW
1023
1024=item Can't open input file %s as stdin
1025
be771a83
GS
1026(F) An error peculiar to VMS. Perl does its own command line
1027redirection, and couldn't open the file specified after '<' on the
1028command line for reading.
748a9306
LW
1029
1030=item Can't open output file %s as stdout
1031
be771a83
GS
1032(F) An error peculiar to VMS. Perl does its own command line
1033redirection, and couldn't open the file specified after '>' or '>>' on
1034the command line for writing.
748a9306
LW
1035
1036=item Can't open output pipe (name: %s)
1037
be771a83
GS
1038(P) An error peculiar to VMS. Perl does its own command line
1039redirection, and couldn't open the pipe into which to send data destined
1040for stdout.
748a9306 1041
2b8ca739 1042=item Can't open perl script%s
a0d0e21e
LW
1043
1044(F) The script you specified can't be opened for the indicated reason.
1045
fa3aa65a
JC
1046If you're debugging a script that uses #!, and normally relies on the
1047shell's $PATH search, the -S option causes perl to do that search, so
1048you don't have to type the path or C<`which $scriptname`>.
1049
6df41af2
GS
1050=item Can't read CRTL environ
1051
1052(S) A warning peculiar to VMS. Perl tried to read an element of %ENV
1053from the CRTL's internal environment array and discovered the array was
1054missing. You need to figure out where your CRTL misplaced its environ
be771a83
GS
1055or define F<PERL_ENV_TABLES> (see L<perlvms>) so that environ is not
1056searched.
6df41af2 1057
6df41af2
GS
1058=item Can't "redo" outside a loop block
1059
1060(F) A "redo" statement was executed to restart the current block, but
1061there isn't a current block. Note that an "if" or "else" block doesn't
1062count as a "loopish" block, as doesn't a block given to sort(), map()
1063or grep(). You can usually double the curlies to get the same effect
1064though, because the inner curlies will be considered a block that
1065loops once. See L<perlfunc/redo>.
1066
64977eb6 1067=item Can't remove %s: %s, skipping file
10f9c03d 1068
be771a83
GS
1069(S inplace) You requested an inplace edit without creating a backup
1070file. Perl was unable to remove the original file to replace it with
1071the modified file. The file was left unmodified.
10f9c03d 1072
a0d0e21e
LW
1073=item Can't rename %s to %s: %s, skipping file
1074
e476b1b5 1075(S inplace) The rename done by the B<-i> switch failed for some reason,
10f9c03d 1076probably because you don't have write permission to the directory.
a0d0e21e 1077
748a9306
LW
1078=item Can't reopen input pipe (name: %s) in binary mode
1079
be771a83
GS
1080(P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried
1081to reopen it to accept binary data. Alas, it failed.
748a9306 1082
fe13d51d 1083=item Can't resolve method "%s" overloading "%s" in package "%s"
6df41af2 1084
be771a83
GS
1085(F|P) Error resolving overloading specified by a method name (as opposed
1086to a subroutine reference): no such method callable via the package. If
2fe2bdfd 1087the method name is C<???>, this is an internal error.
6df41af2 1088
cd06dffe
GS
1089=item Can't return %s from lvalue subroutine
1090
be771a83
GS
1091(F) Perl detected an attempt to return illegal lvalues (such as
1092temporary or readonly values) from a subroutine used as an lvalue. This
1093is not allowed.
cd06dffe 1094
96ebfdd7
RK
1095=item Can't return outside a subroutine
1096
1097(F) The return statement was executed in mainline code, that is, where
1098there was no subroutine call to return out of. See L<perlsub>.
1099
78f9721b
SM
1100=item Can't return %s to lvalue scalar context
1101
1102(F) You tried to return a complete array or hash from an lvalue subroutine,
1103but you called the subroutine in a way that made Perl think you meant
1104to return only one value. You probably meant to write parentheses around
1105the call to the subroutine, which tell Perl that the call should be in
1106list context.
1107
a0d0e21e
LW
1108=item Can't stat script "%s"
1109
be771a83
GS
1110(P) For some reason you can't fstat() the script even though you have it
1111open already. Bizarre.
a0d0e21e 1112
a0d0e21e
LW
1113=item Can't take log of %g
1114
fb73857a
PP
1115(F) For ordinary real numbers, you can't take the logarithm of a
1116negative number or zero. There's a Math::Complex package that comes
be771a83
GS
1117standard with Perl, though, if you really want to do that for the
1118negative numbers.
a0d0e21e
LW
1119
1120=item Can't take sqrt of %g
1121
1122(F) For ordinary real numbers, you can't take the square root of a
fb73857a
PP
1123negative number. There's a Math::Complex package that comes standard
1124with Perl, though, if you really want to do that.
a0d0e21e
LW
1125
1126=item Can't undef active subroutine
1127
1128(F) You can't undefine a routine that's currently running. You can,
1129however, redefine it while it's running, and you can even undef the
1130redefined subroutine while the old routine is running. Go figure.
1131
c81225bc 1132=item Can't upgrade %s (%d) to %d
a0d0e21e 1133
be771a83
GS
1134(P) The internal sv_upgrade routine adds "members" to an SV, making it
1135into a more specialized kind of SV. The top several SV types are so
1136specialized, however, that they cannot be interconverted. This message
1137indicates that such a conversion was attempted.
a0d0e21e 1138
1db89ea5
BS
1139=item Can't use anonymous symbol table for method lookup
1140
e27ad1f2 1141(F) The internal routine that does method lookup was handed a symbol
1db89ea5
BS
1142table that doesn't have a name. Symbol tables can become anonymous
1143for example by undefining stashes: C<undef %Some::Package::>.
1144
96ebfdd7
RK
1145=item Can't use an undefined value as %s reference
1146
1147(F) A value used as either a hard reference or a symbolic reference must
1148be a defined value. This helps to delurk some insidious errors.
1149
6df41af2
GS
1150=item Can't use bareword ("%s") as %s ref while "strict refs" in use
1151
be771a83
GS
1152(F) Only hard references are allowed by "strict refs". Symbolic
1153references are disallowed. See L<perlref>.
6df41af2 1154
90b75b61 1155=item Can't use %! because Errno.pm is not available
1d2dff63
GS
1156
1157(F) The first time the %! hash is used, perl automatically loads the
1158Errno.pm module. The Errno module is expected to tie the %! hash to
1159provide symbolic names for C<$!> errno values.
1160
1109a392
MHM
1161=item Can't use both '<' and '>' after type '%c' in %s
1162
1163(F) A type cannot be forced to have both big-endian and little-endian
1164byte-order at the same time, so this combination of modifiers is not
1165allowed. See L<perlfunc/pack>.
1166
6df41af2
GS
1167=item Can't use %s for loop variable
1168
be771a83
GS
1169(F) Only a simple scalar variable may be used as a loop variable on a
1170foreach.
6df41af2 1171
aab6a793 1172=item Can't use global %s in "%s"
6df41af2 1173
be771a83
GS
1174(F) You tried to declare a magical variable as a lexical variable. This
1175is not allowed, because the magic can be tied to only one location
1176(namely the global variable) and it would be incredibly confusing to
1177have variables in your program that looked like magical variables but
6df41af2
GS
1178weren't.
1179
6d3b25aa
RGS
1180=item Can't use '%c' in a group with different byte-order in %s
1181
1182(F) You attempted to force a different byte-order on a type
1183that is already inside a group with a byte-order modifier.
1184For example you cannot force little-endianness on a type that
1185is inside a big-endian group.
1186
c07a80fd
PP
1187=item Can't use "my %s" in sort comparison
1188
1189(F) The global variables $a and $b are reserved for sort comparisons.
c47ff5f1 1190You mentioned $a or $b in the same line as the <=> or cmp operator,
c07a80fd
PP
1191and the variable had earlier been declared as a lexical variable.
1192Either qualify the sort variable with the package name, or rename the
1193lexical variable.
1194
a0d0e21e
LW
1195=item Can't use %s ref as %s ref
1196
1197(F) You've mixed up your reference types. You have to dereference a
1198reference of the type needed. You can use the ref() function to
1199test the type of the reference, if need be.
1200
748a9306 1201=item Can't use string ("%s") as %s ref while "strict refs" in use
a0d0e21e 1202
be771a83
GS
1203(F) Only hard references are allowed by "strict refs". Symbolic
1204references are disallowed. See L<perlref>.
a0d0e21e 1205
748a9306
LW
1206=item Can't use subscript on %s
1207
1208(F) The compiler tried to interpret a bracketed expression as a
1209subscript. But to the left of the brackets was an expression that
209e7cf1 1210didn't look like a hash or array reference, or anything else subscriptable.
748a9306 1211
6df41af2
GS
1212=item Can't use \%c to mean $%c in expression
1213
75b44862
GS
1214(W syntax) In an ordinary expression, backslash is a unary operator that
1215creates a reference to its argument. The use of backslash to indicate a
1216backreference to a matched substring is valid only as part of a regular
be771a83
GS
1217expression pattern. Trying to do this in ordinary Perl code produces a
1218value that prints out looking like SCALAR(0xdecaf). Use the $1 form
1219instead.
6df41af2 1220
0d863452 1221=item Can't use "when" outside a topicalizer
dc57907a 1222
0d863452
RH
1223(F) You have used a when() block that is neither inside a C<foreach>
1224loop nor a C<given> block. (Note that this error is issued on exit
1225from the C<when> block, so you won't get the error if the match fails,
1226or if you use an explicit C<continue>.)
1227
810b8aa5
GS
1228=item Can't weaken a nonreference
1229
1230(F) You attempted to weaken something that was not a reference. Only
1231references can be weakened.
1232
5f05dabc 1233=item Can't x= to read-only value
a0d0e21e 1234
be771a83
GS
1235(F) You tried to repeat a constant value (often the undefined value)
1236with an assignment operator, which implies modifying the value itself.
a0d0e21e
LW
1237Perhaps you need to copy the value to a temporary, and repeat that.
1238
4a68bf9d 1239=item Character following "\c" must be ASCII
f9d13529 1240
17a3df4c
KW
1241(F|W deprecated, syntax) In C<\cI<X>>, I<X> must be an ASCII character.
1242It is planned to make this fatal in all instances in Perl 5.16. In the
1243cases where it isn't fatal, the character this evaluates to is
1244derived by exclusive or'ing the code point of this character with 0x40.
1245
1246Note that non-alphabetic ASCII characters are discouraged here as well.
f9d13529 1247
f337b084 1248=item Character in 'C' format wrapped in pack
ac7cd81a
SC
1249
1250(W pack) You said
1251
1252 pack("C", $x)
1253
1254where $x is either less than 0 or more than 255; the C<"C"> format is
1255only for encoding native operating system characters (ASCII, EBCDIC,
1256and so on) and not for Unicode characters, so Perl behaved as if you meant
1257
1258 pack("C", $x & 255)
1259
1260If you actually want to pack Unicode codepoints, use the C<"U"> format
1261instead.
1262
f337b084
TH
1263=item Character in 'W' format wrapped in pack
1264
1265(W pack) You said
1266
1267 pack("U0W", $x)
1268
1269where $x is either less than 0 or more than 255. However, C<U0>-mode expects
1270all values to fall in the interval [0, 255], so Perl behaved as if you
1271meant:
1272
1273 pack("U0W", $x & 255)
1274
1275=item Character in 'c' format wrapped in pack
ac7cd81a
SC
1276
1277(W pack) You said
1278
1279 pack("c", $x)
1280
1281where $x is either less than -128 or more than 127; the C<"c"> format
1282is only for encoding native operating system characters (ASCII, EBCDIC,
1283and so on) and not for Unicode characters, so Perl behaved as if you meant
1284
1285 pack("c", $x & 255);
1286
1287If you actually want to pack Unicode codepoints, use the C<"U"> format
1288instead.
1289
f337b084
TH
1290=item Character in '%c' format wrapped in unpack
1291
1292(W unpack) You tried something like
1293
1294 unpack("H", "\x{2a1}")
1295
1a147d38 1296where the format expects to process a byte (a character with a value
f337b084
TH
1297below 256), but a higher value was provided instead. Perl uses the value
1298modulus 256 instead, as if you had provided:
1299
1300 unpack("H", "\x{a1}")
1301
1302=item Character(s) in '%c' format wrapped in pack
1303
1304(W pack) You tried something like
1305
1306 pack("u", "\x{1f3}b")
1307
1a147d38
YO
1308where the format expects to process a sequence of bytes (character with a
1309value below 256), but some of the characters had a higher value. Perl
f337b084
TH
1310uses the character values modulus 256 instead, as if you had provided:
1311
1312 pack("u", "\x{f3}b")
1313
1314=item Character(s) in '%c' format wrapped in unpack
1315
1316(W unpack) You tried something like
1317
1318 unpack("s", "\x{1f3}b")
1319
1a147d38
YO
1320where the format expects to process a sequence of bytes (character with a
1321value below 256), but some of the characters had a higher value. Perl
f337b084
TH
1322uses the character values modulus 256 instead, as if you had provided:
1323
1324 unpack("s", "\x{f3}b")
1325
f866a7cd
FC
1326=item "\c{" is deprecated and is more clearly written as ";"
1327
1328(D deprecated, syntax) The C<\cI<X>> construct is intended to be a way
1329to specify non-printable characters. You used it with a "{" which
1330evaluates to ";", which is printable. It is planned to remove the
1331ability to specify a semi-colon this way in Perl 5.16. Just use a
1332semi-colon or a backslash-semi-colon without the "\c".
1333
1334=item "\c%c" is more clearly written simply as "%s"
1335
1336(W syntax) The C<\cI<X>> construct is intended to be a way to specify
1337non-printable characters. You used it for a printable one, which is better
1338written as simply itself, perhaps preceded by a backslash for non-word
1339characters.
1340
96ebfdd7
RK
1341=item close() on unopened filehandle %s
1342
1343(W unopened) You tried to close a filehandle that was never opened.
1344
abc7ecad
SP
1345=item closedir() attempted on invalid dirhandle %s
1346
1347(W io) The dirhandle you tried to close is either closed or not really
1348a dirhandle. Check your control flow.
1349
541ed3a9
FC
1350=item Closure prototype called
1351
1352(F) If a closure has attributes, the subroutine passed to an attribute
1353handler is the prototype that is cloned when a new closure is created.
1354This subroutine cannot be called.
1355
49704364
LW
1356=item Code missing after '/'
1357
1358(F) You had a (sub-)template that ends with a '/'. There must be another
1359template code following the slash. See L<perlfunc/pack>.
1360
0876b9a0
KW
1361=item Code point 0x%X is not Unicode, may not be portable
1362
9ae3ac1a
KW
1363=item Code point 0x%X is not Unicode, no properties match it; all inverse properties do
1364
0876b9a0
KW
1365(W utf8) You had a code point above the Unicode maximum of U+10FFFF.
1366
1367Perl allows strings to contain a superset of Unicode code
1368points, up to the limit of what is storable in an unsigned integer on
1369your system, but these may not be accepted by other languages/systems.
1370At one time, it was legal in some standards to have code points up to
13710x7FFF_FFFF, but not higher. Code points above 0xFFFF_FFFF require
1372larger than a 32 bit word.
1373
9ae3ac1a
KW
1374None of the Unicode or Perl-defined properties will match a non-Unicode
1375code point. For example,
1376
1377 chr(0x7FF_FFFF) =~ /\p{Any}/
1378
1379will not match, because the code point is not in Unicode. But
1380
1381 chr(0x7FF_FFFF) =~ /\P{Any}/
1382
1383will match.
1384
6df41af2
GS
1385=item %s: Command not found
1386
be771a83
GS
1387(A) You've accidentally run your script through B<csh> instead of Perl.
1388Check the #! line, or manually feed your script into Perl yourself.
6df41af2 1389
7a2e2cd6
PP
1390=item Compilation failed in require
1391
1392(F) Perl could not compile a file specified in a C<require> statement.
be771a83
GS
1393Perl uses this generic message when none of the errors that it
1394encountered were severe enough to halt compilation immediately.
7a2e2cd6 1395
c3464db5
DD
1396=item Complex regular subexpression recursion limit (%d) exceeded
1397
be771a83
GS
1398(W regexp) The regular expression engine uses recursion in complex
1399situations where back-tracking is required. Recursion depth is limited
1400to 32766, or perhaps less in architectures where the stack cannot grow
1401arbitrarily. ("Simple" and "medium" situations are handled without
1402recursion and are not subject to a limit.) Try shortening the string
1403under examination; looping in Perl code (e.g. with C<while>) rather than
1404in the regular expression engine; or rewriting the regular expression so
c2e66d9e 1405that it is simpler or backtracks less. (See L<perlfaq2> for information
be771a83 1406on I<Mastering Regular Expressions>.)
c3464db5 1407
38875929
DM
1408=item cond_broadcast() called on unlocked variable
1409
1410(W threads) Within a thread-enabled program, you tried to call
1411cond_broadcast() on a variable which wasn't locked. The cond_broadcast()
a568ca76 1412function is used to wake up another thread that is waiting in a
38875929 1413cond_wait(). To ensure that the signal isn't sent before the other thread
a568ca76
FC
1414has a chance to enter the wait, it is usual for the signaling thread
1415first to wait for a lock on variable. This lock attempt will only succeed
38875929
DM
1416after the other thread has entered cond_wait() and thus relinquished the
1417lock.
1418
38875929
DM
1419=item cond_signal() called on unlocked variable
1420
1421(W threads) Within a thread-enabled program, you tried to call
1422cond_signal() on a variable which wasn't locked. The cond_signal()
a568ca76 1423function is used to wake up another thread that is waiting in a
38875929 1424cond_wait(). To ensure that the signal isn't sent before the other thread
a568ca76
FC
1425has a chance to enter the wait, it is usual for the signaling thread
1426first to wait for a lock on variable. This lock attempt will only succeed
38875929
DM
1427after the other thread has entered cond_wait() and thus relinquished the
1428lock.
1429
69282e91 1430=item connect() on closed socket %s
a0d0e21e 1431
be771a83
GS
1432(W closed) You tried to do a connect on a closed socket. Did you forget
1433to check the return value of your socket() call? See
1434L<perlfunc/connect>.
a0d0e21e 1435
41ab332f 1436=item Constant(%s)%s: %s
6df41af2 1437
be771a83
GS
1438(F) The parser found inconsistencies either while attempting to define
1439an overloaded constant, or when trying to find the character name
1440specified in the C<\N{...}> escape. Perhaps you forgot to load the
1441corresponding C<overload> or C<charnames> pragma? See L<charnames> and
1442L<overload>.
6df41af2 1443
fc8cd66c
YO
1444=item Constant(%s)%s: %s in regex; marked by <-- HERE in m/%s/
1445
1a147d38
YO
1446(F) The parser found inconsistencies while attempting to find
1447the character name specified in the C<\N{...}> escape. Perhaps you
1448forgot to load the corresponding C<charnames> pragma?
fc8cd66c
YO
1449See L<charnames>.
1450
1451
779c5bc9
GS
1452=item Constant is not %s reference
1453
1454(F) A constant value (perhaps declared using the C<use constant> pragma)
be771a83
GS
1455is being dereferenced, but it amounts to the wrong type of reference.
1456The message indicates the type of reference that was expected. This
1457usually indicates a syntax error in dereferencing the constant value.
779c5bc9
GS
1458See L<perlsub/"Constant Functions"> and L<constant>.
1459
4cee8e80
CS
1460=item Constant subroutine %s redefined
1461
bb028877 1462(S) You redefined a subroutine which had previously been
be771a83
GS
1463eligible for inlining. See L<perlsub/"Constant Functions"> for
1464commentary and workarounds.
4cee8e80 1465
9607fc9c
PP
1466=item Constant subroutine %s undefined
1467
be771a83
GS
1468(W misc) You undefined a subroutine which had previously been eligible
1469for inlining. See L<perlsub/"Constant Functions"> for commentary and
1470workarounds.
9607fc9c 1471
e7ea3e70
IZ
1472=item Copy method did not return a reference
1473
64977eb6 1474(F) The method which overloads "=" is buggy. See
13a2d996 1475L<overload/Copy Constructor>.
e7ea3e70 1476
6798c92b
GS
1477=item CORE::%s is not a keyword
1478
1479(F) The CORE:: namespace is reserved for Perl keywords.
1480
a0d0e21e
LW
1481=item corrupted regexp pointers
1482
1483(P) The regular expression engine got confused by what the regular
1484expression compiler gave it.
1485
1486=item corrupted regexp program
1487
be771a83
GS
1488(P) The regular expression engine got passed a regexp program without a
1489valid magic number.
a0d0e21e 1490
de42a5a9 1491=item Corrupt malloc ptr 0x%x at 0x%x
6df41af2
GS
1492
1493(P) The malloc package that comes with Perl had an internal failure.
1494
49704364
LW
1495=item Count after length/code in unpack
1496
1497(F) You had an unpack template indicating a counted-length string, but
1498you have also specified an explicit size for the string. See
1499L<perlfunc/pack>.
1500
a0d0e21e
LW
1501=item Deep recursion on subroutine "%s"
1502
be771a83
GS
1503(W recursion) This subroutine has called itself (directly or indirectly)
1504100 times more than it has returned. This probably indicates an
1505infinite recursion, unless you're writing strange benchmark programs, in
1506which case it indicates something else.
a0d0e21e 1507
aad1d01f
NC
1508This threshold can be changed from 100, by recompiling the F<perl> binary,
1509setting the C pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
1510
f10b0346 1511=item defined(@array) is deprecated
69794302 1512
be771a83
GS
1513(D deprecated) defined() is not usually useful on arrays because it
1514checks for an undefined I<scalar> value. If you want to see if the
64977eb6 1515array is empty, just use C<if (@array) { # not empty }> for example.
69794302 1516
f10b0346 1517=item defined(%hash) is deprecated
69794302 1518
be771a83
GS
1519(D deprecated) defined() is not usually useful on hashes because it
1520checks for an undefined I<scalar> value. If you want to see if the hash
64977eb6 1521is empty, just use C<if (%hash) { # not empty }> for example.
69794302 1522
bcb95744
FC
1523=item (?(DEFINE)....) does not allow branches in regex; marked by <-- HERE in m/%s/
1524
1525(F) You used something like C<(?(DEFINE)...|..)> which is illegal. The
1526most likely cause of this error is that you left out a parenthesis inside
1527of the C<....> part.
1528
1529The <-- HERE shows in the regular expression about where the problem was
1530discovered.
1531
62658f4d
PM
1532=item %s defines neither package nor VERSION--version check failed
1533
1534(F) You said something like "use Module 42" but in the Module file
1535there are neither package declarations nor a C<$VERSION>.
1536
fc36a67e
PP
1537=item Delimiter for here document is too long
1538
be771a83
GS
1539(F) In a here document construct like C<<<FOO>, the label C<FOO> is too
1540long for Perl to handle. You have to be seriously twisted to write code
1541that triggers this error.
fc36a67e 1542
4a68bf9d 1543=item Deprecated character in \N{...}; marked by <-- HERE in \N{%s<-- HERE %s
cb233ae3
KW
1544
1545(D deprecated) Just about anything is legal for the C<...> in C<\N{...}>.
5fca8acb
FC
1546But starting in 5.12, non-reasonable ones that don't look like names
1547are deprecated. A reasonable name begins with an alphabetic character
1548and continues with any combination of alphanumerics, dashes, spaces,
1549parentheses or colons.
cb233ae3 1550
6d3b25aa
RGS
1551=item Deprecated use of my() in false conditional
1552
1553(D deprecated) You used a declaration similar to C<my $x if 0>.
1554There has been a long-standing bug in Perl that causes a lexical variable
1555not to be cleared at scope exit when its declaration includes a false
1556conditional. Some people have exploited this bug to achieve a kind of
1557static variable. Since we intend to fix this bug, we don't want people
1558relying on this behavior. You can achieve a similar static effect by
1559declaring the variable in a separate block outside the function, eg
36fb85f3 1560
6d3b25aa
RGS
1561 sub f { my $x if 0; return $x++ }
1562
1563becomes
1564
1565 { my $x; sub f { return $x++ } }
1566
36fb85f3
RGS
1567Beginning with perl 5.9.4, you can also use C<state> variables to
1568have lexicals that are initialized only once (see L<feature>):
1569
1570 sub f { state $x; return $x++ }
1571
500ab966
RGS
1572=item DESTROY created new reference to dead object '%s'
1573
1574(F) A DESTROY() method created a new reference to the object which is
1575just being DESTROYed. Perl is confused, and prefers to abort rather than
1576to create a dangling reference.
1577
3cdd684c
TP
1578=item Did not produce a valid header
1579
1580See Server error.
1581
6df41af2
GS
1582=item %s did not return a true value
1583
1584(F) A required (or used) file must return a true value to indicate that
1585it compiled correctly and ran its initialization code correctly. It's
1586traditional to end such a file with a "1;", though any true value would
1587do. See L<perlfunc/require>.
1588
cc507455 1589=item (Did you mean &%s instead?)
4633a7c4 1590
413ff9f6
FC
1591(W misc) You probably referred to an imported subroutine &FOO as $FOO or
1592some such.
4633a7c4 1593
cc507455 1594=item (Did you mean "local" instead of "our"?)
33633739 1595
be771a83
GS
1596(W misc) Remember that "our" does not localize the declared global
1597variable. You have declared it again in the same lexical scope, which
1598seems superfluous.
33633739 1599
cc507455 1600=item (Did you mean $ or @ instead of %?)
a0d0e21e 1601
be771a83
GS
1602(W) You probably said %hash{$key} when you meant $hash{$key} or
1603@hash{@keys}. On the other hand, maybe you just meant %hash and got
1604carried away.
748a9306 1605
7e1af8bc 1606=item Died
5f05dabc
PP
1607
1608(F) You passed die() an empty string (the equivalent of C<die "">) or
075b00aa 1609you called it with no args and C<$@> was empty.
5f05dabc 1610
3cdd684c
TP
1611=item Document contains no data
1612
1613See Server error.
1614
62658f4d
PM
1615=item %s does not define %s::VERSION--version check failed
1616
1617(F) You said something like "use Module 42" but the Module did not
1618define a C<$VERSION.>
1619
49704364
LW
1620=item '/' does not take a repeat count
1621
1622(F) You cannot put a repeat count of any kind right after the '/' code.
1623See L<perlfunc/pack>.
1624
a0d0e21e
LW
1625=item Don't know how to handle magic of type '%s'
1626
1627(P) The internal handling of magical variables has been cursed.
1628
1629=item do_study: out of memory
1630
1631(P) This should have been caught by safemalloc() instead.
1632
6df41af2
GS
1633=item (Do you need to predeclare %s?)
1634
56da5a46
RGS
1635(S syntax) This is an educated guess made in conjunction with the message
1636"%s found where operator expected". It often means a subroutine or module
6df41af2
GS
1637name is being referenced that hasn't been declared yet. This may be
1638because of ordering problems in your file, or because of a missing
be771a83
GS
1639"sub", "package", "require", or "use" statement. If you're referencing
1640something that isn't defined yet, you don't actually have to define the
1641subroutine or package before the current location. You can use an empty
1642"sub foo;" or "package FOO;" to enter a "forward" declaration.
6df41af2 1643
ac206dc8
RGS
1644=item dump() better written as CORE::dump()
1645
1646(W misc) You used the obsolescent C<dump()> built-in function, without fully
1647qualifying it as C<CORE::dump()>. Maybe it's a typo. See L<perlfunc/dump>.
1648
84d78eb7
YO
1649=item dump is not supported
1650
1651(F) Your machine doesn't support dump/undump.
1652
a0d0e21e
LW
1653=item Duplicate free() ignored
1654
be771a83
GS
1655(S malloc) An internal routine called free() on something that had
1656already been freed.
a0d0e21e 1657
1109a392
MHM
1658=item Duplicate modifier '%c' after '%c' in %s
1659
1660(W) You have applied the same modifier more than once after a type
1661in a pack template. See L<perlfunc/pack>.
1662
4633a7c4
LW
1663=item elseif should be elsif
1664
56da5a46
RGS
1665(S syntax) There is no keyword "elseif" in Perl because Larry thinks it's
1666ugly. Your code will be interpreted as an attempt to call a method named
be771a83 1667"elseif" for the class returned by the following block. This is
4633a7c4
LW
1668unlikely to be what you want.
1669
ab13f0c7
JH
1670=item Empty %s
1671
af6f566e
HS
1672(F) C<\p> and C<\P> are used to introduce a named Unicode property, as
1673described in L<perlunicode> and L<perlre>. You used C<\p> or C<\P> in
1674a regular expression without specifying the property name.
ab13f0c7 1675
85ab1d1d 1676=item entering effective %s failed
5ff3f7a4 1677
85ab1d1d 1678(F) While under the C<use filetest> pragma, switching the real and
5ff3f7a4
GS
1679effective uids or gids failed.
1680
c038024b
RGS
1681=item %ENV is aliased to %s
1682
1683(F) You're running under taint mode, and the C<%ENV> variable has been
1684aliased to another hash, so it doesn't reflect anymore the state of the
1685program's environment. This is potentially insecure.
1686
748a9306
LW
1687=item Error converting file specification %s
1688
5f05dabc 1689(F) An error peculiar to VMS. Because Perl may have to deal with file
748a9306 1690specifications in either VMS or Unix syntax, it converts them to a
be771a83
GS
1691single form when it must operate on them directly. Either you've passed
1692an invalid file specification to Perl, or you've found a case the
1693conversion routines don't handle. Drat.
748a9306 1694
e4d48cc9
GS
1695=item %s: Eval-group in insecure regular expression
1696
be771a83
GS
1697(F) Perl detected tainted data when trying to compile a regular
1698expression that contains the C<(?{ ... })> zero-width assertion, which
1699is unsafe. See L<perlre/(?{ code })>, and L<perlsec>.
e4d48cc9 1700
fc8f615e 1701=item %s: Eval-group not allowed at runtime, use re 'eval'
e4d48cc9 1702
be771a83
GS
1703(F) Perl tried to compile a regular expression containing the
1704C<(?{ ... })> zero-width assertion at run time, as it would when the
f11307f5
FC
1705pattern contains interpolated values. Since that is a security risk,
1706it is not allowed. If you insist, you may still do this by using the
1707C<re 'eval'> pragma or by explicitly building the pattern from an
1708interpolated string at run time and using that in an eval(). See
1709L<perlre/(?{ code })>.
e4d48cc9 1710
6df41af2
GS
1711=item %s: Eval-group not allowed, use re 'eval'
1712
be771a83
GS
1713(F) A regular expression contained the C<(?{ ... })> zero-width
1714assertion, but that construct is only allowed when the C<use re 'eval'>
1715pragma is in effect. See L<perlre/(?{ code })>.
6df41af2 1716
1a147d38
YO
1717=item EVAL without pos change exceeded limit in regex; marked by <-- HERE in m/%s/
1718
1719(F) You used a pattern that nested too many EVAL calls without consuming
1720any text. Restructure the pattern so that text is consumed.
1721
1722The <-- HERE shows in the regular expression about where the problem was
1723discovered.
1724
fc36a67e
PP
1725=item Excessively long <> operator
1726
1727(F) The contents of a <> operator may not exceed the maximum size of a
1728Perl identifier. If you're just trying to glob a long list of
1729filenames, try using the glob() operator, or put the filenames into a
1730variable and glob that.
1731
ed9aa3b7
SG
1732=item exec? I'm not *that* kind of operating system
1733
af8bb25a
FC
1734(F) The C<exec> function is not implemented on some systems, e.g., Symbian
1735OS. See L<perlport>.
ed9aa3b7 1736
fe13d51d 1737=item Execution of %s aborted due to compilation errors.
a0d0e21e
LW
1738
1739(F) The final summary message when a Perl compilation fails.
1740
1741=item Exiting eval via %s
1742
be771a83
GS
1743(W exiting) You are exiting an eval by unconventional means, such as a
1744goto, or a loop control statement.
e476b1b5
GS
1745
1746=item Exiting format via %s
1747
9a2ff54b 1748(W exiting) You are exiting a format by unconventional means, such as a
be771a83 1749goto, or a loop control statement.
a0d0e21e 1750
0a753a76
PP
1751=item Exiting pseudo-block via %s
1752
be771a83
GS
1753(W exiting) You are exiting a rather special block construct (like a
1754sort block or subroutine) by unconventional means, such as a goto, or a
1755loop control statement. See L<perlfunc/sort>.
0a753a76 1756
a0d0e21e
LW
1757=item Exiting subroutine via %s
1758
be771a83
GS
1759(W exiting) You are exiting a subroutine by unconventional means, such
1760as a goto, or a loop control statement.
a0d0e21e
LW
1761
1762=item Exiting substitution via %s
1763
be771a83
GS
1764(W exiting) You are exiting a substitution by unconventional means, such
1765as a return, a goto, or a loop control statement.
a0d0e21e 1766
7b8d334a
GS
1767=item Explicit blessing to '' (assuming package main)
1768
be771a83
GS
1769(W misc) You are blessing a reference to a zero length string. This has
1770the effect of blessing the reference into the package main. This is
1771usually not what you want. Consider providing a default target package,
1772e.g. bless($ref, $p || 'MyPackage');
7b8d334a 1773
6df41af2
GS
1774=item %s: Expression syntax
1775
be771a83
GS
1776(A) You've accidentally run your script through B<csh> instead of Perl.
1777Check the #! line, or manually feed your script into Perl yourself.
6df41af2
GS
1778
1779=item %s failed--call queue aborted
1780
3c10abe3
AG
1781(F) An untrapped exception was raised while executing a UNITCHECK,
1782CHECK, INIT, or END subroutine. Processing of the remainder of the
1783queue of such routines has been prematurely ended.
6df41af2 1784
7253e4e3 1785=item False [] range "%s" in regex; marked by <-- HERE in m/%s/
73b437c8 1786
be771a83 1787(W regexp) A character class range must start and end at a literal
7253e4e3
RK
1788character, not another character class like C<\d> or C<[:alpha:]>. The "-"
1789in your false range is interpreted as a literal "-". Consider quoting the
1790"-", "\-". The <-- HERE shows in the regular expression about where the
1791problem was discovered. See L<perlre>.
73b437c8 1792
1b1ee2ef 1793=item Fatal VMS error (status=%d) at %s, line %d
a0d0e21e 1794
be771a83
GS
1795(P) An error peculiar to VMS. Something untoward happened in a VMS
1796system service or RTL routine; Perl's exit status should provide more
1797details. The filename in "at %s" and the line number in "line %d" tell
1798you which section of the Perl source code is distressed.
a0d0e21e
LW
1799
1800=item fcntl is not implemented
1801
1802(F) Your machine apparently doesn't implement fcntl(). What is this, a
1803PDP-11 or something?
1804
22846ab4
AB
1805=item FETCHSIZE returned a negative value
1806
1807(F) A tied array claimed to have a negative number of elements, which
1808is not possible.
1809
f337b084
TH
1810=item Field too wide in 'u' format in pack
1811
1812(W pack) Each line in an uuencoded string start with a length indicator
1813which can't encode values above 63. So there is no point in asking for
1814a line length bigger than that. Perl will behave as if you specified
5c96f6f7 1815C<u63> as the format.
f337b084 1816
af8c498a 1817=item Filehandle %s opened only for input
a0d0e21e 1818
6c8d78fb
HS
1819(W io) You tried to write on a read-only filehandle. If you intended
1820it to be a read-write filehandle, you needed to open it with "+<" or
1821"+>" or "+>>" instead of with "<" or nothing. If you intended only to
1822write the file, use ">" or ">>". See L<perlfunc/open>.
a0d0e21e 1823
af8c498a 1824=item Filehandle %s opened only for output
a0d0e21e 1825
6c8d78fb
HS
1826(W io) You tried to read from a filehandle opened only for writing, If
1827you intended it to be a read/write filehandle, you needed to open it
89a1bda8
FC
1828with "+<" or "+>" or "+>>" instead of with ">". If you intended only to
1829read from the file, use "<". See L<perlfunc/open>. Another possibility
1830is that you attempted to open filedescriptor 0 (also known as STDIN) for
1831output (maybe you closed STDIN earlier?).
97828cef
RGS
1832
1833=item Filehandle %s reopened as %s only for input
1834
1835(W io) You opened for reading a filehandle that got the same filehandle id
d7f8936a 1836as STDOUT or STDERR. This occurred because you closed STDOUT or STDERR
97828cef
RGS
1837previously.
1838
1839=item Filehandle STDIN reopened as %s only for output
1840
1841(W io) You opened for writing a filehandle that got the same filehandle id
d7f8936a 1842as STDIN. This occurred because you closed STDIN previously.
a0d0e21e
LW
1843
1844=item Final $ should be \$ or $name
1845
1846(F) You must now decide whether the final $ in a string was meant to be
be771a83
GS
1847a literal dollar sign, or was meant to introduce a variable name that
1848happens to be missing. So you have to put either the backslash or the
1849name.
a0d0e21e 1850
56e90b21
GS
1851=item flock() on closed filehandle %s
1852
be771a83 1853(W closed) The filehandle you're attempting to flock() got itself closed
c289d2f7 1854some time before now. Check your control flow. flock() operates on
be771a83
GS
1855filehandles. Are you attempting to call flock() on a dirhandle by the
1856same name?
56e90b21 1857
6df41af2
GS
1858=item Format not terminated
1859
1860(F) A format must be terminated by a line with a solitary dot. Perl got
1861to the end of your file without finding such a line.
1862
a0d0e21e
LW
1863=item Format %s redefined
1864
e476b1b5 1865(W redefine) You redefined a format. To suppress this warning, say
a0d0e21e
LW
1866
1867 {
271595cc 1868 no warnings 'redefine';
a0d0e21e
LW
1869 eval "format NAME =...";
1870 }
1871
a0d0e21e
LW
1872=item Found = in conditional, should be ==
1873
e476b1b5 1874(W syntax) You said
a0d0e21e
LW
1875
1876 if ($foo = 123)
1877
1878when you meant
1879
1880 if ($foo == 123)
1881
1882(or something like that).
1883
6df41af2
GS
1884=item %s found where operator expected
1885
56da5a46
RGS
1886(S syntax) The Perl lexer knows whether to expect a term or an operator.
1887If it sees what it knows to be a term when it was expecting to see an
be771a83
GS
1888operator, it gives you this warning. Usually it indicates that an
1889operator or delimiter was omitted, such as a semicolon.
6df41af2 1890
a0d0e21e
LW
1891=item gdbm store returned %d, errno %d, key "%s"
1892
1893(S) A warning from the GDBM_File extension that a store failed.
1894
1895=item gethostent not implemented
1896
1897(F) Your C library apparently doesn't implement gethostent(), probably
1898because if it did, it'd feel morally obligated to return every hostname
1899on the Internet.
1900
69282e91 1901=item get%sname() on closed socket %s
a0d0e21e 1902
be771a83
GS
1903(W closed) You tried to get a socket or peer socket name on a closed
1904socket. Did you forget to check the return value of your socket() call?
a0d0e21e 1905
748a9306
LW
1906=item getpwnam returned invalid UIC %#o for user "%s"
1907
1908(S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
1909C<getpwnam> operator returned an invalid UIC.
1910
6df41af2
GS
1911=item getsockopt() on closed socket %s
1912
be771a83
GS
1913(W closed) You tried to get a socket option on a closed socket. Did you
1914forget to check the return value of your socket() call? See
6df41af2
GS
1915L<perlfunc/getsockopt>.
1916
1917=item Global symbol "%s" requires explicit package name
1918
a4edf47d 1919(F) You've said "use strict" or "use strict vars", which indicates
30c282f6 1920that all variables must either be lexically scoped (using "my" or "state"),
a4edf47d
GS
1921declared beforehand using "our", or explicitly qualified to say
1922which package the global variable is in (using "::").
6df41af2 1923
e476b1b5
GS
1924=item glob failed (%s)
1925
be771a83
GS
1926(W glob) Something went wrong with the external program(s) used for
1927C<glob> and C<< <*.c> >>. Usually, this means that you supplied a
1928C<glob> pattern that caused the external program to fail and exit with a
1929nonzero status. If the message indicates that the abnormal exit
1930resulted in a coredump, this may also mean that your csh (C shell) is
1931broken. If so, you should change all of the csh-related variables in
1932config.sh: If you have tcsh, make the variables refer to it as if it
1933were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all
1934empty (except that C<d_csh> should be C<'undef'>) so that Perl will
1935think csh is missing. In either case, after editing config.sh, run
75b44862 1936C<./Configure -S> and rebuild Perl.
e476b1b5 1937
a0d0e21e
LW
1938=item Glob not terminated
1939
1940(F) The lexer saw a left angle bracket in a place where it was expecting
be771a83
GS
1941a term, so it's looking for the corresponding right angle bracket, and
1942not finding it. Chances are you left some needed parentheses out
1943earlier in the line, and you really meant a "less than".
a0d0e21e 1944
bcd05b94 1945=item gmtime(%f) too large
8b56d6ff 1946
e9200be3 1947(W overflow) You called C<gmtime> with a number that was larger than
fc003d4b
MS
1948it can reliably handle and C<gmtime> probably returned the wrong
1949date. This warning is also triggered with nan (the special
1950not-a-number value).
1951
bcd05b94 1952=item gmtime(%f) too small
fc003d4b 1953
e9200be3 1954(W overflow) You called C<gmtime> with a number that was smaller than
fc003d4b
MS
1955it can reliably handle and C<gmtime> probably returned the wrong
1956date. This warning is also triggered with nan (the special
1957not-a-number value).
8b56d6ff 1958
6df41af2 1959=item Got an error from DosAllocMem
a0d0e21e 1960
6df41af2
GS
1961(P) An error peculiar to OS/2. Most probably you're using an obsolete
1962version of Perl, and this should not happen anyway.
a0d0e21e
LW
1963
1964=item goto must have label
1965
1966(F) Unlike with "next" or "last", you're not allowed to goto an
1967unspecified destination. See L<perlfunc/goto>.
1968
49704364 1969=item ()-group starts with a count
18529408 1970
bca4a986
FC
1971(F) A ()-group started with a count. A count is supposed to follow
1972something: a template character or a ()-group. See L<perlfunc/pack>.
18529408 1973
fe13d51d 1974=item %s had compilation errors.
6df41af2
GS
1975
1976(F) The final summary message when a C<perl -c> fails.
1977
a0d0e21e
LW
1978=item Had to create %s unexpectedly
1979
be771a83
GS
1980(S internal) A routine asked for a symbol from a symbol table that ought
1981to have existed already, but for some reason it didn't, and had to be
1982created on an emergency basis to prevent a core dump.
a0d0e21e
LW
1983
1984=item Hash %%s missing the % in argument %d of %s()
1985
be771a83
GS
1986(D deprecated) Really old Perl let you omit the % on hash names in some
1987spots. This is now heavily deprecated.
a0d0e21e 1988
6df41af2
GS
1989=item %s has too many errors
1990
1991(F) The parser has given up trying to parse the program after 10 errors.
1992Further error messages would likely be uninformative.
1993
e6897b1a
KW
1994=item Having no space between pattern and following word is deprecated
1995
1996(D syntax)
1997
1998You had a word that isn't a regex modifier immediately following a pattern
1999without an intervening space. For example, the two constructs:
2000
2001 $a =~ m/$foo/sand $bar
2002 $a =~ m/$foo/s and $bar
2003
21356872
FC
2004both currently mean the same thing, but it is planned to disallow the first
2005form in Perl 5.16. And,
e6897b1a
KW
2006
2007 $a =~ m/$foo/and $bar
2008
2009will be disallowed too.
2010
252aa082
JH
2011=item Hexadecimal number > 0xffffffff non-portable
2012
e476b1b5 2013(W portable) The hexadecimal number you specified is larger than 2**32-1
9e24b6e2
JH
2014(4294967295) and therefore non-portable between systems. See
2015L<perlport> for more on portability concerns.
252aa082 2016
8903cb82
PP
2017=item Identifier too long
2018
2019(F) Perl limits identifiers (names for variables, functions, etc.) to
fc36a67e 2020about 250 characters for simple names, and somewhat more for compound
be771a83
GS
2021names (like C<$A::B>). You've exceeded Perl's limits. Future versions
2022of Perl are likely to eliminate these arbitrary limitations.
8903cb82 2023
c3c41406 2024=item Ignoring zero length \N{} in character class
fc8cd66c 2025
ff3f963a
KW
2026(W) Named Unicode character escapes (\N{...}) may return a
2027zero length sequence. When such an escape is used in a character class
1a147d38 2028its behaviour is not well defined. Check that the correct escape has
fc8cd66c
YO
2029been used, and the correct charname handler is in scope.
2030
6df41af2 2031=item Illegal binary digit %s
f675dbe5 2032
6df41af2 2033(F) You used a digit other than 0 or 1 in a binary number.
f675dbe5 2034
6df41af2 2035=item Illegal binary digit %s ignored
a0d0e21e 2036
be771a83
GS
2037(W digit) You may have tried to use a digit other than 0 or 1 in a
2038binary number. Interpretation of the binary number stopped before the
2039offending digit.
a0d0e21e 2040
78d0fecf 2041=item Illegal character \%o (carriage return)
4fdae800 2042
d5898338 2043(F) Perl normally treats carriage returns in the program text as it
be771a83
GS
2044would any other whitespace, which means you should never see this error
2045when Perl was built using standard options. For some reason, your
2046version of Perl appears to have been built without this support. Talk
2047to your Perl administrator.
4fdae800 2048
d37a9538
ST
2049=item Illegal character in prototype for %s : %s
2050
197afce1 2051(W illegalproto) An illegal character was found in a prototype declaration.
2e9cc7ef 2052Legal characters in prototypes are $, @, %, *, ;, [, ], &, \, and +.
d37a9538 2053
904d85c5
RGS
2054=item Illegal declaration of anonymous subroutine
2055
2056(F) When using the C<sub> keyword to construct an anonymous subroutine,
2057you must always specify a block of code. See L<perlsub>.
2058
8e742a20
MHM
2059=item Illegal declaration of subroutine %s
2060
2061(F) A subroutine was not declared correctly. See L<perlsub>.
2062
a0d0e21e
LW
2063=item Illegal division by zero
2064
be771a83
GS
2065(F) You tried to divide a number by 0. Either something was wrong in
2066your logic, or you need to put a conditional in to guard against
2067meaningless input.
a0d0e21e 2068
6df41af2
GS
2069=item Illegal hexadecimal digit %s ignored
2070
be771a83
GS
2071(W digit) You may have tried to use a character other than 0 - 9 or
2072A - F, a - f in a hexadecimal number. Interpretation of the hexadecimal
2073number stopped before the illegal character.
6df41af2 2074
a0d0e21e
LW
2075=item Illegal modulus zero
2076
be771a83
GS
2077(F) You tried to divide a number by 0 to get the remainder. Most
2078numbers don't take to this kindly.
a0d0e21e 2079
6df41af2 2080=item Illegal number of bits in vec
399388f4 2081
6df41af2
GS
2082(F) The number of bits in vec() (the third argument) must be a power of
2083two from 1 to 32 (or 64, if your platform supports that).
399388f4
GS
2084
2085=item Illegal octal digit %s
a0d0e21e 2086
d1be9408 2087(F) You used an 8 or 9 in an octal number.
a0d0e21e 2088
399388f4 2089=item Illegal octal digit %s ignored
748a9306 2090
d1be9408 2091(W digit) You may have tried to use an 8 or 9 in an octal number.
75b44862 2092Interpretation of the octal number stopped before the 8 or 9.
748a9306 2093
fe13d51d 2094=item Illegal switch in PERL5OPT: -%c
6ff81951 2095
6df41af2 2096(X) The PERL5OPT environment variable may only be used to set the
646ca9b2 2097following switches: B<-[CDIMUdmtw]>.
6ff81951 2098
6df41af2 2099=item Ill-formed CRTL environ value "%s"
81e118e0 2100
75b44862 2101(W internal) A warning peculiar to VMS. Perl tried to read the CRTL's
be771a83
GS
2102internal environ array, and encountered an element without the C<=>
2103delimiter used to separate keys from values. The element is ignored.
09bef843 2104
6df41af2 2105=item Ill-formed message in prime_env_iter: |%s|
54310121 2106
be771a83
GS
2107(W internal) A warning peculiar to VMS. Perl tried to read a logical
2108name or CLI symbol definition when preparing to iterate over %ENV, and
2109didn't see the expected delimiter between key and value, so the line was
2110ignored.
54310121 2111
6df41af2 2112=item (in cleanup) %s
9607fc9c 2113
be771a83
GS
2114(W misc) This prefix usually indicates that a DESTROY() method raised
2115the indicated exception. Since destructors are usually called by the
2116system at arbitrary points during execution, and often a vast number of
2117times, the warning is issued only once for any number of failures that
2118would otherwise result in the same message being repeated.
6df41af2 2119
be771a83
GS
2120Failure of user callbacks dispatched using the C<G_KEEPERR> flag could
2121also result in this warning. See L<perlcall/G_KEEPERR>.
9607fc9c 2122
2c7d6b9c
RGS
2123=item Inconsistent hierarchy during C3 merge of class '%s': merging failed on parent '%s'
2124
2125(F) The method resolution order (MRO) of the given class is not
2126C3-consistent, and you have enabled the C3 MRO for this class. See the C3
2127documentation in L<mro> for more information.
2128
979699d9
JH
2129=item In EBCDIC the v-string components cannot exceed 2147483647
2130
2131(F) An error peculiar to EBCDIC. Internally, v-strings are stored as
2132Unicode code points, and encoded in EBCDIC as UTF-EBCDIC. The UTF-EBCDIC
2133encoding is limited to code points no larger than 2147483647 (0x7FFFFFFF).
2134
1a147d38
YO
2135=item Infinite recursion in regex; marked by <-- HERE in m/%s/
2136
2137(F) You used a pattern that references itself without consuming any input
2138text. You should check the pattern to ensure that recursive patterns
2139either consume text or fail.
2140
2141The <-- HERE shows in the regular expression about where the problem was
2142discovered.
2143
6dbe9451
NC
2144=item Initialization of state variables in list context currently forbidden
2145
2146(F) Currently the implementation of "state" only permits the initialization
2147of scalar variables in scalar context. Re-write C<state ($a) = 42> as
2148C<state $a = 42> to change from list to scalar context. Constructions such
2149as C<state (@a) = foo()> will be supported in a future perl release.
2150
a0d0e21e
LW
2151=item Insecure dependency in %s
2152
8b1a09fc 2153(F) You tried to do something that the tainting mechanism didn't like.
be771a83
GS
2154The tainting mechanism is turned on when you're running setuid or
2155setgid, or when you specify B<-T> to turn it on explicitly. The
2156tainting mechanism labels all data that's derived directly or indirectly
2157from the user, who is considered to be unworthy of your trust. If any
2158such data is used in a "dangerous" operation, you get this error. See
2159L<perlsec> for more information.
a0d0e21e
LW
2160
2161=item Insecure directory in %s
2162
be771a83
GS
2163(F) You can't use system(), exec(), or a piped open in a setuid or
2164setgid script if C<$ENV{PATH}> contains a directory that is writable by
df98f984
RGS
2165the world. Also, the PATH must not contain any relative directory.
2166See L<perlsec>.
a0d0e21e 2167
62f468fc 2168=item Insecure $ENV{%s} while running %s
a0d0e21e
LW
2169
2170(F) You can't use system(), exec(), or a piped open in a setuid or
62f468fc 2171setgid script if any of C<$ENV{PATH}>, C<$ENV{IFS}>, C<$ENV{CDPATH}>,
332d5f78
SR
2172C<$ENV{ENV}>, C<$ENV{BASH_ENV}> or C<$ENV{TERM}> are derived from data
2173supplied (or potentially supplied) by the user. The script must set
2174the path to a known value, using trustworthy data. See L<perlsec>.
a0d0e21e 2175
b9ef414d
FC
2176=item Integer overflow in format string for %s
2177
2178(F) The indexes and widths specified in the format string of C<printf()>
2179or C<sprintf()> are too large. The numbers must not overflow the size of
2180integers for your architecture.
2181
a7ae9550
GS
2182=item Integer overflow in %s number
2183
75b44862 2184(W overflow) The hexadecimal, octal or binary number you have specified
be771a83
GS
2185either as a literal or as an argument to hex() or oct() is too big for
2186your architecture, and has been converted to a floating point number.
2187On a 32-bit architecture the largest hexadecimal, octal or binary number
9e24b6e2
JH
2188representable without overflow is 0xFFFFFFFF, 037777777777, or
21890b11111111111111111111111111111111 respectively. Note that Perl
2190transparently promotes all numbers to a floating point representation
2191internally--subject to loss of precision errors in subsequent
2192operations.
bbce6d69 2193
46314c13
JP
2194=item Integer overflow in version
2195
2196(F) Some portion of a version initialization is too large for the
2197size of integers for your architecture. This is not a warning
2198because there is no rational reason for a version to try and use a
2199element larger than typically 2**32. This is usually caused by
2200trying to use some odd mathematical operation as a version, like
2201100/9.
2202
7253e4e3 2203=item Internal disaster in regex; marked by <-- HERE in m/%s/
6df41af2
GS
2204
2205(P) Something went badly wrong in the regular expression parser.
7253e4e3 2206The <-- HERE shows in the regular expression about where the problem was
b45f050a
JF
2207discovered.
2208
748a9306
LW
2209=item Internal inconsistency in tracking vforks
2210
be771a83
GS
2211(S) A warning peculiar to VMS. Perl keeps track of the number of times
2212you've called C<fork> and C<exec>, to determine whether the current call
2213to C<exec> should affect the current script or a subprocess (see
2214L<perlvms/"exec LIST">). Somehow, this count has become scrambled, so
2215Perl is making a guess and treating this C<exec> as a request to
2216terminate the Perl script and execute the specified command.
748a9306 2217
7253e4e3 2218=item Internal urp in regex; marked by <-- HERE in m/%s/
b45f050a 2219
7253e4e3
RK
2220(P) Something went badly awry in the regular expression parser. The
2221<-- HERE shows in the regular expression about where the problem was
2222discovered.
a0d0e21e 2223
6df41af2
GS
2224=item %s (...) interpreted as function
2225
75b44862 2226(W syntax) You've run afoul of the rule that says that any list operator
be771a83 2227followed by parentheses turns into a function, with all the list
64977eb6 2228operators arguments found inside the parentheses. See
13a2d996 2229L<perlop/Terms and List Operators (Leftward)>.
6df41af2 2230
09bef843
SB
2231=item Invalid %s attribute: %s
2232
a4a4c9e2 2233(F) The indicated attribute for a subroutine or variable was not recognized
09bef843
SB
2234by Perl or by a user-supplied handler. See L<attributes>.
2235
2236=item Invalid %s attributes: %s
2237
a4a4c9e2 2238(F) The indicated attributes for a subroutine or variable were not
be771a83 2239recognized by Perl or by a user-supplied handler. See L<attributes>.
09bef843 2240
c635e13b
PP
2241=item Invalid conversion in %s: "%s"
2242
be771a83
GS
2243(W printf) Perl does not understand the given format conversion. See
2244L<perlfunc/sprintf>.
c635e13b 2245
9e08bc66
ST
2246=item Invalid escape in the specified encoding in regex; marked by <-- HERE in m/%s/
2247
2248(W regexp) The numeric escape (for example C<\xHH>) of value < 256
2249didn't correspond to a single character through the conversion
2250from the encoding specified by the encoding pragma.
2251The escape was replaced with REPLACEMENT CHARACTER (U+FFFD) instead.
2252The <-- HERE shows in the regular expression about where the
2253escape was discovered.
2254
8149aa9f
FC
2255=item Invalid hexadecimal number in \N{U+...}
2256
2257(F) The character constant represented by C<...> is not a valid hexadecimal
74f8e9e3
FC
2258number. Either it is empty, or you tried to use a character other than
22590 - 9 or A - F, a - f in a hexadecimal number.
8149aa9f 2260
2c7d6b9c
RGS
2261=item Invalid mro name: '%s'
2262
162a3e34
FC
2263(F) You tried to C<mro::set_mro("classname", "foo")> or C<use mro 'foo'>,
2264where C<foo> is not a valid method resolution order (MRO). Currently,
2265the only valid ones supported are C<dfs> and C<c3>, unless you have loaded
2266a module that is a MRO plugin. See L<mro> and L<perlmroapi>.
2c7d6b9c 2267
7253e4e3 2268=item Invalid [] range "%s" in regex; marked by <-- HERE in m/%s/
6df41af2
GS
2269
2270(F) The range specified in a character class had a minimum character
7253e4e3
RK
2271greater than the maximum character. One possibility is that you forgot the
2272C<{}> from your ending C<\x{}> - C<\x> without the curly braces can go only
2273up to C<ff>. The <-- HERE shows in the regular expression about where the
2274problem was discovered. See L<perlre>.
6df41af2 2275
d1573ac7 2276=item Invalid range "%s" in transliteration operator
c2e66d9e
GS
2277
2278(F) The range specified in the tr/// or y/// operator had a minimum
2279character greater than the maximum character. See L<perlop>.
2280
09bef843
SB
2281=item Invalid separator character %s in attribute list
2282
0120eecf 2283(F) Something other than a colon or whitespace was seen between the
be771a83
GS
2284elements of an attribute list. If the previous attribute had a
2285parenthesised parameter list, perhaps that list was terminated too soon.
2286See L<attributes>.
09bef843 2287
b4581f09
JH
2288=item Invalid separator character %s in PerlIO layer specification %s
2289
2bfc5f71
FC
2290(W layer) When pushing layers onto the Perl I/O system, something other
2291than a colon or whitespace was seen between the elements of a layer list.
b4581f09
JH
2292If the previous attribute had a parenthesised parameter list, perhaps that
2293list was terminated too soon.
2294
2c86d456
DG
2295=item Invalid strict version format (%s)
2296
2297(F) A version number did not meet the "strict" criteria for versions.
2298A "strict" version number is a positive decimal number (integer or
2299decimal-fraction) without exponentiation or else a dotted-decimal
2300v-string with a leading 'v' character and at least three components.
a6485a24 2301The parenthesized text indicates which criteria were not met.
2c86d456
DG
2302See the L<version> module for more details on allowed version formats.
2303
49704364 2304=item Invalid type '%s' in %s
96e4d5b1 2305
49704364
LW
2306(F) The given character is not a valid pack or unpack type.
2307See L<perlfunc/pack>.
2308(W) The given character is not a valid pack or unpack type but used to be
75b44862 2309silently ignored.
96e4d5b1 2310
2c86d456
DG
2311=item Invalid version format (%s)
2312
2313(F) A version number did not meet the "lax" criteria for versions.
2314A "lax" version number is a positive decimal number (integer or
2315decimal-fraction) without exponentiation or else a dotted-decimal
9da2b86b
FC
2316v-string. If the v-string has fewer than three components, it must
2317have a leading 'v' character. Otherwise, the leading 'v' is optional.
2318Both decimal and dotted-decimal versions may have a trailing "alpha"
2c86d456
DG
2319component separated by an underscore character after a fractional or
2320dotted-decimal component. The parenthesized text indicates which
a6485a24 2321criteria were not met. See the L<version> module for more details on
2c86d456 2322allowed version formats.
46314c13 2323
798ae1b7
DG
2324=item Invalid version object
2325
2326(F) The internal structure of the version object was invalid. Perhaps
2327the internals were modified directly in some way or an arbitrary reference
2328was blessed into the "version" class.
2329
a0d0e21e
LW
2330=item ioctl is not implemented
2331
2332(F) Your machine apparently doesn't implement ioctl(), which is pretty
2333strange for a machine that supports C.
2334
c289d2f7
JH
2335=item ioctl() on unopened %s
2336
2337(W unopened) You tried ioctl() on a filehandle that was never opened.
34b6fd5e 2338Check your control flow and number of arguments.
c289d2f7 2339
fe13d51d 2340=item IO layers (like '%s') unavailable
363c40c4
SB
2341
2342(F) Your Perl has not been configured to have PerlIO, and therefore
34b6fd5e 2343you cannot use IO layers. To have PerlIO, Perl must be configured
363c40c4
SB
2344with 'useperlio'.
2345
80cbd5ad
JH
2346=item IO::Socket::atmark not implemented on this architecture
2347
2348(F) Your machine doesn't implement the sockatmark() functionality,
34b6fd5e 2349neither as a system call nor an ioctl call (SIOCATMARK).
80cbd5ad 2350
b4581f09
JH
2351=item $* is no longer supported
2352
a58ac25e
FC
2353(D deprecated, syntax) The special variable C<$*>, deprecated in older
2354perls, has been removed as of 5.9.0 and is no longer supported. In
2355previous versions of perl the use of C<$*> enabled or disabled multi-line
2356matching within a string.
4fd19576
B
2357
2358Instead of using C<$*> you should use the C</m> (and maybe C</s>) regexp
570dedd4
FC
2359modifiers. You can enable C</m> for a lexical scope (even a whole file)
2360with C<use re '/m'>. (In older versions: when C<$*> was set to a true value
2361then all regular expressions behaved as if they were written using C</m>.)
b4581f09 2362
8ae1fe26
RGS
2363=item $# is no longer supported
2364
a58ac25e
FC
2365(D deprecated, syntax) The special variable C<$#>, deprecated in older
2366perls, has been removed as of 5.9.3 and is no longer supported. You
2367should use the printf/sprintf functions instead.
8ae1fe26 2368
6ad11d81
JH
2369=item `%s' is not a code reference
2370
04a80ee0
RGS
2371(W overload) The second (fourth, sixth, ...) argument of overload::constant
2372needs to be a code reference. Either an anonymous subroutine, or a reference
6ad11d81
JH
2373to a subroutine.
2374
2375=item `%s' is not an overloadable type
2376
04a80ee0
RGS
2377(W overload) You tried to overload a constant type the overload package is
2378unaware of.
6ad11d81 2379
a0d0e21e
LW
2380=item junk on end of regexp
2381
2382(P) The regular expression parser is confused.
2383
2384=item Label not found for "last %s"
2385
be771a83
GS
2386(F) You named a loop to break out of, but you're not currently in a loop
2387of that name, not even if you count where you were called from. See
2388L<perlfunc/last>.
a0d0e21e
LW
2389
2390=item Label not found for "next %s"
2391
2392(F) You named a loop to continue, but you're not currently in a loop of
2393that name, not even if you count where you were called from. See
2394L<perlfunc/last>.
2395
2396=item Label not found for "redo %s"
2397
2398(F) You named a loop to restart, but you're not currently in a loop of
2399that name, not even if you count where you were called from. See
2400L<perlfunc/last>.
2401
85ab1d1d 2402=item leaving effective %s failed
5ff3f7a4 2403
85ab1d1d 2404(F) While under the C<use filetest> pragma, switching the real and
5ff3f7a4
GS
2405effective uids or gids failed.
2406
49704364
LW
2407=item length/code after end of string in unpack
2408
d7f8936a 2409(F) While unpacking, the string buffer was already used up when an unpack
49704364
LW
2410length/code combination tried to obtain more data. This results in
2411an undefined value for the length. See L<perlfunc/pack>.
2412
f0e67a1d
Z
2413=item Lexing code attempted to stuff non-Latin-1 character into Latin-1 input
2414
2415(F) An extension is attempting to insert text into the current parse
d35a2c71
FC
2416(using L<lex_stuff_pvn_flags|perlapi/lex_stuff_pvn_flags> or similar), but tried to insert a character
2417that couldn't be part of the current input. This is an inherent pitfall
2418of the stuffing mechanism, and one of the reasons to avoid it. Where it
2419is necessary to stuff, stuffing only plain ASCII is recommended.
f0e67a1d
Z
2420
2421=item Lexing code internal error (%s)
2422
2423(F) Lexing code supplied by an extension violated the lexer's API in a
2424detectable way.
2425
69282e91 2426=item listen() on closed socket %s
a0d0e21e 2427
be771a83
GS
2428(W closed) You tried to do a listen on a closed socket. Did you forget
2429to check the return value of your socket() call? See
2430L<perlfunc/listen>.
a0d0e21e 2431
bcd05b94 2432=item localtime(%f) too large
8b56d6ff 2433
e9200be3 2434(W overflow) You called C<localtime> with a number that was larger
fc003d4b
MS
2435than it can reliably handle and C<localtime> probably returned the
2436wrong date. This warning is also triggered with nan (the special
2437not-a-number value).
2438
bcd05b94 2439=item localtime(%f) too small
fc003d4b 2440
e9200be3 2441(W overflow) You called C<localtime> with a number that was smaller
fc003d4b
MS
2442than it can reliably handle and C<localtime> probably returned the
2443wrong date. This warning is also triggered with nan (the special
2444not-a-number value).
8b56d6ff 2445
58e23c8d 2446=item Lookbehind longer than %d not implemented in regex m/%s/
b45f050a
JF
2447
2448(F) There is currently a limit on the length of string which lookbehind can
58e23c8d 2449handle. This restriction may be eased in a future release.
2e50fd82 2450
b88df990
NC
2451=item Lost precision when %s %f by 1
2452
2453(W) The value you attempted to increment or decrement by one is too large
2454for the underlying floating point representation to store accurately,
2455hence the target of C<++> or C<--> is unchanged. Perl issues this warning
2456because it has already switched from integers to floating point when values
2457are too large for integers, and now even floating point is insufficient.
2458You may wish to switch to using L<Math::BigInt> explicitly.
2459
2f7da168
RK
2460=item lstat() on filehandle %s
2461
2462(W io) You tried to do an lstat on a filehandle. What did you mean
2463by that? lstat() makes sense only on filenames. (Perl did a fstat()
2464instead on the filehandle.)
2465
885ef6f5
GG
2466=item lvalue attribute ignored after the subroutine has been defined
2467
963d9ce9 2468(W misc) Making a subroutine an lvalue subroutine after it has been defined
d9159685
RS
2469by declaring the subroutine with an lvalue attribute is not
2470possible. To make the subroutine an lvalue subroutine add the
e2bd2e2b 2471lvalue attribute to the definition, or put the declaration before
885ef6f5
GG
2472the definition.
2473
96ebfdd7
RK
2474=item Lvalue subs returning %s not implemented yet
2475
2476(F) Due to limitations in the current implementation, array and hash
2477values cannot be returned in subroutines used in lvalue context. See
2478L<perlsub/"Lvalue subroutines">.
2479
2db62bbc 2480=item Malformed integer in [] in pack
49704364 2481
2db62bbc 2482(F) Between the brackets enclosing a numeric repeat count only digits
49704364
LW
2483are permitted. See L<perlfunc/pack>.
2484
2485=item Malformed integer in [] in unpack
2486
2db62bbc 2487(F) Between the brackets enclosing a numeric repeat count only digits
49704364
LW
2488are permitted. See L<perlfunc/pack>.
2489
6df41af2
GS
2490=item Malformed PERLLIB_PREFIX
2491
2492(F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
2493
2494 prefix1;prefix2
2495
2496or
6df41af2
GS
2497 prefix1 prefix2
2498
be771a83
GS
2499with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
2500a builtin library search path, prefix2 is substituted. The error may
2501appear if components are not found, or are too long. See
fecfaeb8 2502"PERLLIB_PREFIX" in L<perlos2>.
6df41af2 2503
2f758a16
ST
2504=item Malformed prototype for %s: %s
2505
d37a9538
ST
2506(F) You tried to use a function with a malformed prototype. The
2507syntax of function prototypes is given a brief compile-time check for
2508obvious errors like invalid characters. A more rigorous check is run
2509when the function is called.
2f758a16 2510
ba210ebe
JH
2511=item Malformed UTF-8 character (%s)
2512
2575c402
JW
2513(S utf8) (F) Perl detected a string that didn't comply with UTF-8
2514encoding rules, even though it had the UTF8 flag on.
ba210ebe 2515
2575c402
JW
2516One possible cause is that you set the UTF8 flag yourself for data that
2517you thought to be in UTF-8 but it wasn't (it was for example legacy
25188-bit data). To guard against this, you can use Encode::decode_utf8.
2519
2520If you use the C<:encoding(UTF-8)> PerlIO layer for input, invalid byte
2521sequences are handled gracefully, but if you use C<:utf8>, the flag is
2522set without validating the data, possibly resulting in this error
2523message.
2524
2525See also L<Encode/"Handling Malformed Data">.
901b21bf 2526
ff3f963a
KW
2527=item Malformed UTF-8 returned by \N
2528
2529(F) The charnames handler returned malformed UTF-8.
2530
4a5d3a93
FC
2531=item Malformed UTF-8 string in '%c' format in unpack
2532
2533(F) You tried to unpack something that didn't comply with UTF-8 encoding
2534rules and perl was unable to guess how to make more progress.
2535
f337b084
TH
2536=item Malformed UTF-8 string in pack
2537
2538(F) You tried to pack something that didn't comply with UTF-8 encoding
2539rules and perl was unable to guess how to make more progress.
2540
2541=item Malformed UTF-8 string in unpack
2542
2543(F) You tried to unpack something that didn't comply with UTF-8 encoding
2544rules and perl was unable to guess how to make more progress.
2545
4a5d3a93 2546=item Malformed UTF-16 surrogate
f337b084 2547
4a5d3a93
FC
2548(F) Perl thought it was reading UTF-16 encoded character data but while
2549doing it Perl met a malformed Unicode surrogate.
2550
2551=item %s matches null string many times in regex; marked by <-- HERE in m/%s/
2552
2553(W regexp) The pattern you've specified would be an infinite loop if the
2554regular expression engine didn't specifically check for that. The <-- HERE
2555shows in the regular expression about where the problem was discovered.
2556See L<perlre>.
f337b084 2557
de42a5a9 2558=item Maximal count of pending signals (%u) exceeded
2563cec5 2559
2db62bbc 2560(F) Perl aborted due to too high a number of signals pending. This
2563cec5
IZ
2561usually indicates that your operating system tried to deliver signals
2562too fast (with a very high priority), starving the perl process from
2563resources it would need to reach a point where it can process signals
2564safely. (See L<perlipc/"Deferred Signals (Safe Signals)">.)
2565
25f58aea
PN
2566=item "%s" may clash with future reserved word
2567
2568(W) This warning may be due to running a perl5 script through a perl4
2569interpreter, especially if the word that is being warned about is
2570"use" or "my".
2571
49704364 2572=item % may not be used in pack
6df41af2
GS
2573
2574(F) You can't pack a string by supplying a checksum, because the
be771a83
GS
2575checksumming process loses information, and you can't go the other way.
2576See L<perlfunc/unpack>.
6df41af2 2577
a0d0e21e
LW
2578=item Method for operation %s not found in package %s during blessing
2579
2580(F) An attempt was made to specify an entry in an overloading table that
e7ea3e70 2581doesn't resolve to a valid subroutine. See L<overload>.
a0d0e21e 2582
3cdd684c
TP
2583=item Method %s not permitted
2584
2585See Server error.
2586
a0d0e21e
LW
2587=item Might be a runaway multi-line %s string starting on line %d
2588
2589(S) An advisory indicating that the previous error may have been caused
2590by a missing delimiter on a string or pattern, because it eventually
2591ended earlier on the current line.
2592
2593=item Misplaced _ in number
2594
d4ced10d
JH
2595(W syntax) An underscore (underbar) in a numeric constant did not
2596separate two digits.
a0d0e21e 2597
7baa4690
HS
2598=item Missing argument in %s
2599
2600(W uninitialized) A printf-type format required more arguments than were
2601supplied.
2602
9e81e6a1
RGS
2603=item Missing argument to -%c
2604
2605(F) The argument to the indicated command line switch must follow
2606immediately after the switch, without intervening spaces.
2607
ff3f963a 2608=item Missing braces on \N{}
423cee85 2609
4a2d328f 2610(F) Wrong syntax of character name literal C<\N{charname}> within
532cb70d
FC
2611double-quotish context. This can also happen when there is a space
2612(or comment) between the C<\N> and the C<{> in a regex with the C</x> modifier.
2613This modifier does not change the requirement that the brace immediately
2614follow the C<\N>.
423cee85 2615
f0a2b745
KW
2616=item Missing braces on \o{}
2617
2618(F) A C<\o> must be followed immediately by a C<{> in double-quotish context.
2619
a0d0e21e
LW
2620=item Missing comma after first argument to %s function
2621
2622(F) While certain functions allow you to specify a filehandle or an
2623"indirect object" before the argument list, this ain't one of them.
2624
06eaf0bc
GS
2625=item Missing command in piped open
2626
be771a83
GS
2627(W pipe) You used the C<open(FH, "| command")> or
2628C<open(FH, "command |")> construction, but the command was missing or
2629blank.
06eaf0bc 2630
961ce445
RGS
2631=item Missing control char name in \c
2632
2633(F) A double-quoted string ended with "\c", without the required control
2634character name.
2635
6df41af2
GS
2636=item Missing name in "my sub"
2637
be771a83
GS
2638(F) The reserved syntax for lexically scoped subroutines requires that
2639they have a name with which they can be found.
6df41af2
GS
2640
2641=item Missing $ on loop variable
2642
be771a83
GS
2643(F) Apparently you've been programming in B<csh> too much. Variables
2644are always mentioned with the $ in Perl, unlike in the shells, where it
2645can vary from one line to the next.
6df41af2 2646
cc507455 2647=item (Missing operator before %s?)
748a9306 2648
56da5a46
RGS
2649(S syntax) This is an educated guess made in conjunction with the message
2650"%s found where operator expected". Often the missing operator is a comma.
748a9306 2651
ab13f0c7
JH
2652=item Missing right brace on %s
2653
ff3f963a
KW
2654(F) Missing right brace in C<\x{...}>, C<\p{...}>, C<\P{...}>, or C<\N{...}>.
2655
4a68bf9d 2656=item Missing right brace on \N{} or unescaped left brace after \N
ff3f963a 2657
d32207c9
FC
2658(F) C<\N> has two meanings.
2659
2660The traditional one has it followed by a name enclosed in braces,
2661meaning the character (or sequence of characters) given by that
2662name. Thus C<\N{ASTERISK}> is another way of writing C<*>, valid in both
2663double-quoted strings and regular expression patterns. In patterns,
2664it doesn't have the meaning an unescaped C<*> does.
2665
2666Starting in Perl 5.12.0, C<\N> also can have an additional meaning (only)
2667in patterns, namely to match a non-newline character. (This is short
2668for C<[^\n]>, and like C<.> but is not affected by the C</s> regex modifier.)
2669
2670This can lead to some ambiguities. When C<\N> is not followed immediately
2671by a left brace, Perl assumes the C<[^\n]> meaning. Also, if the braces
2672form a valid quantifier such as C<\N{3}> or C<\N{5,}>, Perl assumes that this
2673means to match the given quantity of non-newlines (in these examples,
26743; and 5 or more, respectively). In all other case, where there is a
2675C<\N{> and a matching C<}>, Perl assumes that a character name is desired.
2676
2677However, if there is no matching C<}>, Perl doesn't know if it was
2678mistakenly omitted, or if C<[^\n]{> was desired, and raises this error.
2679If you meant the former, add the right brace; if you meant the latter,
2680escape the brace with a backslash, like so: C<\N\{>
ab13f0c7 2681
d98d5fff 2682=item Missing right curly or square bracket
a0d0e21e 2683
be771a83
GS
2684(F) The lexer counted more opening curly or square brackets than closing
2685ones. As a general rule, you'll find it's missing near the place you
2686were last editing.
a0d0e21e 2687
6df41af2
GS
2688=item (Missing semicolon on previous line?)
2689
56da5a46
RGS
2690(S syntax) This is an educated guess made in conjunction with the message
2691"%s found where operator expected". Don't automatically put a semicolon on
6df41af2
GS
2692the previous line just because you saw this message.
2693
a0d0e21e
LW
2694=item Modification of a read-only value attempted
2695
2696(F) You tried, directly or indirectly, to change the value of a
5f05dabc 2697constant. You didn't, of course, try "2 = 1", because the compiler
a0d0e21e
LW
2698catches that. But an easy way to do the same thing is:
2699
2700 sub mod { $_[0] = 1 }
2701 mod(2);
2702
2703Another way is to assign to a substr() that's off the end of the string.
2704
c5674021
PDF
2705Yet another way is to assign to a C<foreach> loop I<VAR> when I<VAR>
2706is aliased to a constant in the look I<LIST>:
2707
2708 $x = 1;
2709 foreach my $n ($x, 2) {
2710 $n *= 2; # modifies the $x, but fails on attempt to modify the 2
64977eb6 2711 }
c5674021 2712
7a4340ed 2713=item Modification of non-creatable array value attempted, %s
a0d0e21e
LW
2714
2715(F) You tried to make an array value spring into existence, and the
2716subscript was probably negative, even counting from end of the array
2717backwards.
2718
7a4340ed 2719=item Modification of non-creatable hash value attempted, %s
a0d0e21e 2720
be771a83
GS
2721(P) You tried to make a hash value spring into existence, and it
2722couldn't be created for some peculiar reason.
a0d0e21e
LW
2723
2724=item Module name must be constant
2725
2726(F) Only a bare module name is allowed as the first argument to a "use".
2727
be98fb35 2728=item Module name required with -%c option
6df41af2 2729
be98fb35
GS
2730(F) The C<-M> or C<-m> options say that Perl should load some module, but
2731you omitted the name of the module. Consult L<perlrun> for full details
2732about C<-M> and C<-m>.
6df41af2 2733
fe13d51d 2734=item More than one argument to '%s' open
ed9aa3b7
SG
2735
2736(F) The C<open> function has been asked to open multiple files. This
2737can happen if you are trying to open a pipe to a command that takes a
2738list of arguments, but have forgotten to specify a piped open mode.
2739See L<perlfunc/open> for details.
2740
a0d0e21e
LW
2741=item msg%s not implemented
2742
2743(F) You don't have System V message IPC on your system.
2744
2745=item Multidimensional syntax %s not supported
2746
75b44862
GS
2747(W syntax) Multidimensional arrays aren't written like C<$foo[1,2,3]>.
2748They're written like C<$foo[1][2][3]>, as in C.
8b1a09fc 2749
49704364 2750=item '/' must follow a numeric type in unpack
6df41af2 2751
49704364
LW
2752(F) You had an unpack template that contained a '/', but this did not
2753follow some unpack specification producing a numeric value.
2754See L<perlfunc/pack>.
6df41af2
GS
2755
2756=item "my sub" not yet implemented
2757
be771a83
GS
2758(F) Lexically scoped subroutines are not yet implemented. Don't try
2759that yet.
6df41af2 2760
fd1b7234 2761=item "my" variable %s can't be in a package
6df41af2 2762
be771a83
GS
2763(F) Lexically scoped variables aren't in a package, so it doesn't make
2764sense to try to declare one with a package qualifier on the front. Use
2765local() if you want to localize a package variable.
09bef843 2766
8149aa9f
FC
2767=item Name "%s::%s" used only once: possible typo
2768
2769(W once) Typographical errors often show up as unique variable names.
2770If you had a good reason for having a unique name, then just mention it
2771again somehow to suppress the message. The C<our> declaration is
2772provided for this purpose.
2773
2774NOTE: This warning detects symbols that have been used only once so $c, @c,
2775%c, *c, &c, sub c{}, c(), and c (the filehandle or format) are considered
2776the same; if a program uses $c only once but also uses any of the others it
2777will not trigger this warning.
2778
4a68bf9d 2779=item \N in a character class must be a named character: \N{...}
ff3f963a 2780
c3c41406 2781(F) The new (5.12) meaning of C<\N> as C<[^\n]> is not valid in a bracketed
f4e361c7
FC
2782character class, for the same reason that C<.> in a character class loses
2783its specialness: it matches almost everything, which is probably not
2784what you want.
c3c41406 2785
4a68bf9d 2786=item \N{NAME} must be resolved by the lexer
c3c41406 2787
f4e361c7
FC
2788(F) When compiling a regex pattern, an unresolved named character or
2789sequence was encountered. This can happen in any of several ways that
2790bypass the lexer, such as using single-quotish context, or an extra
7fae04b9 2791backslash in double-quotish:
c3c41406
KW
2792
2793 $re = '\N{SPACE}'; # Wrong!
b09c05e6 2794 $re = "\\N{SPACE}"; # Wrong!
c3c41406
KW
2795 /$re/;
2796
b09c05e6 2797Instead, use double-quotes with a single backslash:
c3c41406
KW
2798
2799 $re = "\N{SPACE}"; # ok
2800 /$re/;
2801
2802The lexer can be bypassed as well by creating the pattern from smaller
2803components:
2804
2805 $re = '\N';
2806 /${re}{SPACE}/; # Wrong!
2807
2808It's not a good idea to split a construct in the middle like this, and it
2809doesn't work here. Instead use the solution above.
2810
2811Finally, the message also can happen under the C</x> regex modifier when the
2812C<\N> is separated by spaces from the C<{>, in which case, remove the spaces.
2813
2814 /\N {SPACE}/x; # Wrong!
2815 /\N{SPACE}/x; # ok
ff3f963a 2816
49704364
LW
2817=item Negative '/' count in unpack
2818
2819(F) The length count obtained from a length/code unpack operation was
2820negative. See L<perlfunc/pack>.
2821
a0d0e21e
LW
2822=item Negative length
2823
be771a83
GS
2824(F) You tried to do a read/write/send/recv operation with a buffer
2825length that is less than 0. This is difficult to imagine.
a0d0e21e 2826
ed9aa3b7
SG
2827=item Negative offset to vec in lvalue context
2828
2829(F) When C<vec> is called in an lvalue context, the second argument must be
2830greater than or equal to zero.
2831
7253e4e3 2832=item Nested quantifiers in regex; marked by <-- HERE in m/%s/
a0d0e21e 2833
b45f050a 2834(F) You can't quantify a quantifier without intervening parentheses. So
7253e4e3 2835things like ** or +* or ?* are illegal. The <-- HERE shows in the regular
b45f050a 2836expression about where the problem was discovered.
a0d0e21e 2837
7253e4e3 2838Note that the minimal matching quantifiers, C<*?>, C<+?>, and
be771a83 2839C<??> appear to be nested quantifiers, but aren't. See L<perlre>.
a0d0e21e 2840
6df41af2 2841=item %s never introduced
a0d0e21e 2842
be771a83
GS
2843(S internal) The symbol in question was declared but somehow went out of
2844scope before it could possibly have been used.
a0d0e21e 2845
2c7d6b9c
RGS
2846=item next::method/next::can/maybe::next::method cannot find enclosing method
2847
2848(F) C<next::method> needs to be called within the context of a
2849real method in a real package, and it could not find such a context.
2850See L<mro>.
2851
a0d0e21e
LW
2852=item No %s allowed while running setuid
2853
be771a83
GS
2854(F) Certain operations are deemed to be too insecure for a setuid or
2855setgid script to even be allowed to attempt. Generally speaking there
2856will be another way to do what you want that is, if not secure, at least
2857securable. See L<perlsec>.
a0d0e21e 2858
a0d0e21e
LW
2859=item No comma allowed after %s
2860
2861(F) A list operator that has a filehandle or "indirect object" is not
2862allowed to have a comma between that and the following arguments.
2863Otherwise it'd be just another one of the arguments.
2864
0a753a76
PP
2865One possible cause for this is that you expected to have imported a
2866constant to your name space with B<use> or B<import> while no such
2867importing took place, it may for example be that your operating system
2868does not support that particular constant. Hopefully you did use an
f7af5ce1 2869explicit import list for the constants you expect to see; please see
0a753a76
PP
2870L<perlfunc/use> and L<perlfunc/import>. While an explicit import list
2871would probably have caught this error earlier it naturally does not
2872remedy the fact that your operating system still does not support that
2873constant. Maybe you have a typo in the constants of the symbol import
2874list of B<use> or B<import> or in the constant name at the line where
2875this error was triggered?
2876
748a9306
LW
2877=item No command into which to pipe on command line
2878
be771a83
GS
2879(F) An error peculiar to VMS. Perl handles its own command line
2880redirection, and found a '|' at the end of the command line, so it
2881doesn't know where you want to pipe the output from this command.
748a9306 2882
a0d0e21e
LW
2883=item No DB::DB routine defined
2884
be771a83 2885(F) The currently executing code was compiled with the B<-d> switch, but
f7af5ce1 2886for some reason the current debugger (e.g. F<perl5db.pl> or a C<Devel::>
ccafdc96
RGS
2887module) didn't define a routine to be called at the beginning of each
2888statement.
a0d0e21e
LW
2889
2890=item No dbm on this machine
2891
2892(P) This is counted as an internal error, because every machine should
5f05dabc 2893supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>.
a0d0e21e 2894
ccafdc96 2895=item No DB::sub routine defined
a0d0e21e 2896
ccafdc96
RGS
2897(F) The currently executing code was compiled with the B<-d> switch, but
2898for some reason the current debugger (e.g. F<perl5db.pl> or a C<Devel::>
2899module) didn't define a C<DB::sub> routine to be called at the beginning
2900of each ordinary subroutine call.
a0d0e21e 2901
c47ff5f1 2902=item No error file after 2> or 2>> on command line
748a9306 2903
be771a83
GS
2904(F) An error peculiar to VMS. Perl handles its own command line
2905redirection, and found a '2>' or a '2>>' on the command line, but can't
2906find the name of the file to which to write data destined for stderr.
748a9306 2907
49704364
LW
2908=item No group ending character '%c' found in template
2909
2910(F) A pack or unpack template has an opening '(' or '[' without its
2911matching counterpart. See L<perlfunc/pack>.
2912
c47ff5f1 2913=item No input file after < on command line
748a9306 2914
be771a83
GS
2915(F) An error peculiar to VMS. Perl handles its own command line
2916redirection, and found a '<' on the command line, but can't find the
2917name of the file from which to read data for stdin.
748a9306 2918
2c7d6b9c
RGS
2919=item No next::method '%s' found for %s
2920
2921(F) C<next::method> found no further instances of this method name
2922in the remaining packages of the MRO of this class. If you don't want
2923it throwing an exception, use C<maybe::next::method>
2924or C<next::can>. See L<mro>.
2925
6df41af2
GS
2926=item "no" not allowed in expression
2927
be771a83
GS
2928(F) The "no" keyword is recognized and executed at compile time, and
2929returns no useful value. See L<perlmod>.
6df41af2 2930
c47ff5f1 2931=item No output file after > on command line
748a9306 2932
be771a83
GS
2933(F) An error peculiar to VMS. Perl handles its own command line
2934redirection, and found a lone '>' at the end of the command line, so it
2935doesn't know where you wanted to redirect stdout.
748a9306 2936
c47ff5f1 2937=item No output file after > or >> on command line
748a9306 2938
be771a83
GS
2939(F) An error peculiar to VMS. Perl handles its own command line
2940redirection, and found a '>' or a '>>' on the command line, but can't
2941find the name of the file to which to write data destined for stdout.
748a9306 2942
1ec3e8de
GS
2943=item No package name allowed for variable %s in "our"
2944
be771a83
GS
2945(F) Fully qualified variable names are not allowed in "our"
2946declarations, because that doesn't make much sense under existing
2947semantics. Such syntax is reserved for future extensions.
1ec3e8de 2948
a0d0e21e
LW
2949=item No Perl script found in input
2950
2951(F) You called C<perl -x>, but no line was found in the file beginning
2952with #! and containing the word "perl".
2953
2954=item No setregid available
2955
2956(F) Configure didn't find anything resembling the setregid() call for
2957your system.
2958
2959=item No setreuid available
2960
2961(F) Configure didn't find anything resembling the setreuid() call for
2962your system.
2963
6df41af2
GS
2964=item No %s specified for -%c
2965
2966(F) The indicated command line switch needs a mandatory argument, but
2967you haven't specified one.
f7af5ce1 2968
e75d1f10
RD
2969=item No such class field "%s" in variable %s of type %s
2970
2971(F) You tried to access a key from a hash through the indicated typed variable
2972but that key is not allowed by the package of the same type. The indicated
2973package has restricted the set of allowed keys using the L<fields> pragma.
2974
2c692339
RGS
2975=item No such class %s
2976
dc7e5945
FC
2977(F) You provided a class qualifier in a "my", "our" or "state"
2978declaration, but this class doesn't exist at this point in your program.
2c692339 2979
3c20a832
SP
2980=item No such hook: %s
2981
dc7e5945
FC
2982(F) You specified a signal hook that was not recognized by Perl.
2983Currently, Perl accepts C<__DIE__> and C<__WARN__> as valid signal hooks.
3c20a832 2984
6df41af2
GS
2985=item No such pipe open
2986
2987(P) An error peculiar to VMS. The internal routine my_pclose() tried to
be771a83
GS
2988close a pipe which hadn't been opened. This should have been caught
2989earlier as an attempt to close an unopened filehandle.
6df41af2 2990
a0d0e21e
LW
2991=item No such signal: SIG%s
2992
be771a83
GS
2993(W signal) You specified a signal name as a subscript to %SIG that was
2994not recognized. Say C<kill -l> in your shell to see the valid signal
2995names on your system.
a0d0e21e
LW
2996
2997=item Not a CODE reference
2998
2999(F) Perl was trying to evaluate a reference to a code value (that is, a
3000subroutine), but found a reference to something else instead. You can
be771a83
GS
3001use the ref() function to find out what kind of ref it really was. See
3002also L<perlref>.
a0d0e21e
LW
3003
3004=item Not a format reference
3005
3006(F) I'm not sure how you managed to generate a reference to an anonymous
3007format, but this indicates you did, and that it didn't exist.
3008
3009=item Not a GLOB reference
3010
be771a83
GS
3011(F) Perl was trying to evaluate a reference to a "typeglob" (that is, a
3012symbol table entry that looks like C<*foo>), but found a reference to
3013something else instead. You can use the ref() function to find out what
3014kind of ref it really was. See L<perlref>.
a0d0e21e
LW
3015
3016=item Not a HASH reference
3017
be771a83
GS
3018(F) Perl was trying to evaluate a reference to a hash value, but found a
3019reference to something else instead. You can use the ref() function to
3020find out what kind of ref it really was. See L<perlref>.
a0d0e21e 3021
6df41af2
GS
3022=item Not an ARRAY reference
3023
be771a83
GS
3024(F) Perl was trying to evaluate a reference to an array value, but found
3025a reference to something else instead. You can use the ref() function
3026to find out what kind of ref it really was. See L<perlref>.
6df41af2 3027
a0d0e21e
LW
3028=item Not a SCALAR reference
3029
be771a83
GS
3030(F) Perl was trying to evaluate a reference to a scalar value, but found
3031a reference to something else instead. You can use the ref() function
3032to find out what kind of ref it really was. See L<perlref>.
a0d0e21e
LW
3033
3034=item Not a subroutine reference
3035
3036(F) Perl was trying to evaluate a reference to a code value (that is, a
3037subroutine), but found a reference to something else instead. You can
be771a83
GS
3038use the ref() function to find out what kind of ref it really was. See
3039also L<perlref>.
a0d0e21e 3040
e7ea3e70 3041=item Not a subroutine reference in overload table
a0d0e21e
LW
3042
3043(F) An attempt was made to specify an entry in an overloading table that
8b1a09fc 3044doesn't somehow point to a valid subroutine. See L<overload>.
a0d0e21e 3045
a0d0e21e
LW
3046=item Not enough arguments for %s
3047
3048(F) The function requires more arguments than you specified.
3049
6df41af2
GS
3050=item Not enough format arguments
3051
be771a83
GS
3052(W syntax) A format specified more picture fields than the next line
3053supplied. See L<perlform>.
6df41af2
GS
3054
3055=item %s: not found
3056
be771a83
GS
3057(A) You've accidentally run your script through the Bourne shell instead
3058of Perl. Check the #! line, or manually feed your script into Perl
3059yourself.
6df41af2
GS
3060
3061=item no UTC offset information; assuming local time is UTC
a0d0e21e 3062
6df41af2
GS
3063(S) A warning peculiar to VMS. Perl was unable to find the local
3064timezone offset, so it's assuming that local system time is equivalent
be771a83
GS
3065to UTC. If it's not, define the logical name
3066F<SYS$TIMEZONE_DIFFERENTIAL> to translate to the number of seconds which
3067need to be added to UTC to get local time.
a0d0e21e 3068
f0a2b745
KW
3069=item Non-octal character '%c'. Resolved as "%s"
3070
5493e060
FC
3071(W digit) In parsing an octal numeric constant, a character was
3072unexpectedly encountered that isn't octal. The resulting value is as
3073indicated.
f0a2b745 3074
4ef2275c
GA
3075=item Non-string passed as bitmask
3076
3077(W misc) A number has been passed as a bitmask argument to select().
3078Use the vec() function to construct the file descriptor bitmasks for
bc4b151d 3079select. See L<perlfunc/select>.
4ef2275c 3080
a0d0e21e
LW
3081=item Null filename used
3082
be771a83
GS
3083(F) You can't require the null filename, especially because on many
3084machines that means the current directory! See L<perlfunc/require>.
a0d0e21e 3085
6df41af2
GS
3086=item NULL OP IN RUN
3087
be771a83
GS
3088(P debugging) Some internal routine called run() with a null opcode
3089pointer.
6df41af2 3090
55497cff
PP
3091=item Null picture in formline
3092
3093(F) The first argument to formline must be a valid format picture
3094specification. It was found to be empty, which probably means you
3095supplied it an uninitialized value. See L<perlform>.
3096
a0d0e21e
LW
3097=item Null realloc
3098
3099(P) An attempt was made to realloc NULL.
3100
3101=item NULL regexp argument
3102
5f05dabc 3103(P) The internal pattern matching routines blew it big time.
a0d0e21e
LW
3104
3105=item NULL regexp parameter
3106
3107(P) The internal pattern matching routines are out of their gourd.
3108
fc36a67e
PP
3109=item Number too long
3110
be771a83 3111(F) Perl limits the representation of decimal numbers in programs to
da75cd15 3112about 250 characters. You've exceeded that length. Future
be771a83
GS
3113versions of Perl are likely to eliminate this arbitrary limitation. In
3114the meantime, try using scientific notation (e.g. "1e6" instead of
3115"1_000_000").
fc36a67e 3116
f0a2b745
KW
3117=item Number with no digits
3118
1043934d
FC
3119(F) Perl was looking for a number but found nothing that looked like
3120a number. This happens, for example with C<\o{}>, with no number between
3121the braces.
f0a2b745 3122
6df41af2
GS
3123=item Octal number in vector unsupported
3124
be771a83
GS
3125(F) Numbers with a leading C<0> are not currently allowed in vectors.
3126The octal number interpretation of such numbers may be supported in a
3127future version.
6df41af2 3128
252aa082
JH
3129=item Octal number > 037777777777 non-portable
3130
75b44862 3131(W portable) The octal number you specified is larger than 2**32-1
be771a83
GS
3132(4294967295) and therefore non-portable between systems. See
3133L<perlport> for more on portability concerns.
252aa082 3134
6ad11d81
JH
3135=item Odd number of arguments for overload::constant
3136
04a80ee0
RGS
3137(W overload) The call to overload::constant contained an odd number of
3138arguments. The arguments should come in pairs.
6ad11d81 3139
b21befc1
MG
3140=item Odd number of elements in anonymous hash
3141
3142(W misc) You specified an odd number of elements to initialize a hash,
3143which is odd, because hashes come in key/value pairs.
3144
1930e939 3145=item Odd number of elements in hash assignment
a0d0e21e 3146
be771a83
GS
3147(W misc) You specified an odd number of elements to initialize a hash,
3148which is odd, because hashes come in key/value pairs.
a0d0e21e 3149
bbce6d69
PP
3150=item Offset outside string
3151
a4a4c9e2 3152(F|W layer) You tried to do a read/write/send/recv/seek operation
42bc49da 3153with an offset pointing outside the buffer. This is difficult to
f5a7294f
JH
3154imagine. The sole exceptions to this are that zero padding will
3155take place when going past the end of the string when either
3156C<sysread()>ing a file, or when seeking past the end of a scalar opened
1a7a2554
MB
3157for I/O (in anticipation of future reads and to imitate the behaviour
3158with real files).
bbce6d69 3159
c289d2f7 3160=item %s() on unopened %s
2dd78f96
JH
3161
3162(W unopened) An I/O operation was attempted on a filehandle that was
3163never initialized. You need to do an open(), a sysopen(), or a socket()
3164call, or call a constructor from the FileHandle package.
3165
96ebfdd7
RK
3166=item -%s on unopened filehandle %s
3167
3168(W unopened) You tried to invoke a file test operator on a filehandle
3169that isn't open. Check your control flow. See also L<perlfunc/-X>.
3170
a0d0e21e
LW
3171=item oops: oopsAV
3172
e476b1b5 3173(S internal) An internal warning that the grammar is screwed up.
a0d0e21e
LW
3174
3175=item oops: oopsHV
3176
e476b1b5 3177(S internal) An internal warning that the grammar is screwed up.
a0d0e21e 3178
abc718f2
RGS
3179=item Opening dirhandle %s also as a file
3180
a4a4c9e2 3181(W io, deprecated) You used open() to associate a filehandle to
abc718f2
RGS
3182a symbol (glob or scalar) that already holds a dirhandle.
3183Although legal, this idiom might render your code confusing
3184and is deprecated.
3185
3186=item Opening filehandle %s also as a directory
3187
a4a4c9e2 3188(W io, deprecated) You used opendir() to associate a dirhandle to
abc718f2
RGS
3189a symbol (glob or scalar) that already holds a filehandle.
3190Although legal, this idiom might render your code confusing
3191and is deprecated.
3192
a0288114 3193=item Operation "%s": no method found, %s
44a8e56a 3194
be771a83
GS
3195(F) An attempt was made to perform an overloaded operation for which no
3196handler was defined. While some handlers can be autogenerated in terms
3197of other handlers, there is no default handler for any operation, unless
e4aad80d 3198the C<fallback> overloading key is specified to be true. See L<overload>.
44a8e56a 3199
5ff1373f 3200=item Operation "%s" returns its argument for non-Unicode code point 0x%X
9ae3ac1a 3201
5ff1373f
FC
3202(W) You performed an operation requiring Unicode semantics on a code
3203point that is not in Unicode, so what it should do is not defined. Perl
3204has chosen to have it do nothing, and warn you.
9ae3ac1a
KW
3205
3206If the operation shown is "ToFold", it means that case-insensitive
3207matching in a regular expression was done on the code point.
3208
3209If you know what you are doing you can turn off this warning by
3210C<no warnings 'utf8';>.
3211
5ff1373f 3212=item Operation "%s" returns its argument for UTF-16 surrogate U+%X
9ae3ac1a 3213
5ff1373f
FC
3214(W) You performed an operation requiring Unicode semantics on a Unicode
3215surrogate. Unicode frowns upon the use of surrogates for anything but
3216storing strings in UTF-16, but semantics are (reluctantly) defined for
3217the surrogates, and they are to do nothing for this operation. Because
3218the use of surrogates can be dangerous, Perl warns.
9ae3ac1a
KW
3219
3220If the operation shown is "ToFold", it means that case-insensitive
3221matching in a regular expression was done on the code point.
3222
3223If you know what you are doing you can turn off this warning by
3224C<no warnings 'utf8';>.
3225
748a9306
LW
3226=item Operator or semicolon missing before %s
3227
be771a83
GS
3228(S ambiguous) You used a variable or subroutine call where the parser
3229was expecting an operator. The parser has assumed you really meant to
3230use an operator, but this is highly likely to be incorrect. For
3231example, if you say "*foo *foo" it will be interpreted as if you said
3232"*foo * 'foo'".
748a9306 3233
6df41af2
GS
3234=item "our" variable %s redeclared
3235
be771a83
GS
3236(W misc) You seem to have already declared the same global once before
3237in the current lexical scope.
6df41af2 3238
a80b8354
GS
3239=item Out of memory!
3240
3241(X) The malloc() function returned 0, indicating there was insufficient
be771a83
GS
3242remaining memory (or virtual memory) to satisfy the request. Perl has
3243no option but to exit immediately.
a80b8354 3244
19a52907
JH
3245At least in Unix you may be able to get past this by increasing your
3246process datasize limits: in csh/tcsh use C<limit> and
3247C<limit datasize n> (where C<n> is the number of kilobytes) to check
3248the current limits and change them, and in ksh/bash/zsh use C<ulimit -a>
3249and C<ulimit -d n>, respectively.
3250
6d3b25aa
RGS
3251=item Out of memory during %s extend
3252
3253(X) An attempt was made to extend an array, a list, or a string beyond
3254the largest possible memory allocation.
3255
6df41af2 3256=item Out of memory during "large" request for %s
a0d0e21e 3257
6df41af2
GS
3258(F) The malloc() function returned 0, indicating there was insufficient
3259remaining memory (or virtual memory) to satisfy the request. However,
be771a83
GS
3260the request was judged large enough (compile-time default is 64K), so a
3261possibility to shut down by trapping this error is granted.
a0d0e21e 3262
1b979e0a 3263=item Out of memory during request for %s
a0d0e21e 3264
be771a83
GS
3265(X|F) The malloc() function returned 0, indicating there was
3266insufficient remaining memory (or virtual memory) to satisfy the
3267request.
eff9c6e2
CS
3268
3269The request was judged to be small, so the possibility to trap it
3270depends on the way perl was compiled. By default it is not trappable.
be771a83
GS
3271However, if compiled for this, Perl may use the contents of C<$^M> as an
3272emergency pool after die()ing with this message. In this case the error
b022d2d2
IZ
3273is trappable I<once>, and the error message will include the line and file
3274where the failed request happened.
55497cff 3275
1b979e0a
IZ
3276=item Out of memory during ridiculously large request
3277
3278(F) You can't allocate more than 2^31+"small amount" bytes. This error
be771a83
GS
3279is most likely to be caused by a typo in the Perl program. e.g.,
3280C<$arr[time]> instead of C<$arr[$time]>.
1b979e0a 3281
6df41af2
GS
3282=item Out of memory for yacc stack
3283
be771a83
GS
3284(F) The yacc parser wanted to grow its stack so it could continue
3285parsing, but realloc() wouldn't give it more memory, virtual or
3286otherwise.
6df41af2 3287
28be1210
TH
3288=item '.' outside of string in pack
3289
3290(F) The argument to a '.' in your template tried to move the working
3291position to before the start of the packed string being built.
3292
49704364 3293=item '@' outside of string in unpack
6df41af2 3294
49704364 3295(F) You had a template that specified an absolute position outside
6df41af2
GS
3296the string being unpacked. See L<perlfunc/pack>.
3297
f337b084
TH
3298=item '@' outside of string with malformed UTF-8 in unpack
3299
3300(F) You had a template that specified an absolute position outside
3301the string being unpacked. The string being unpacked was also invalid
3302UTF-8. See L<perlfunc/pack>.
3303
7cb0cfe6
BM
3304=item Overloaded dereference did not return a reference
3305
3306(F) An object with an overloaded dereference operator was dereferenced,
3307but the overloaded operation did not return a reference. See
3308L<overload>.
3309
3310=item Overloaded qr did not return a REGEXP
3311
3312(F) An object with a C<qr> overload was used as part of a match, but the
3313overloaded operation didn't return a compiled regexp. See L<overload>.
3314
6df41af2
GS
3315=item %s package attribute may clash with future reserved word: %s
3316
be771a83
GS
3317(W reserved) A lowercase attribute name was used that had a
3318package-specific handler. That name might have a meaning to Perl itself
3319some day, even though it doesn't yet. Perhaps you should use a
3320mixed-case attribute name, instead. See L<attributes>.
6df41af2 3321
96ebfdd7
RK
3322=item pack/unpack repeat count overflow
3323
3324(F) You can't specify a repeat count so large that it overflows your
3325signed integers. See L<perlfunc/pack>.
3326
a0d0e21e
LW
3327=item page overflow
3328
be771a83
GS
3329(W io) A single call to write() produced more lines than can fit on a
3330page. See L<perlform>.
a0d0e21e 3331
6df41af2
GS
3332=item panic: %s
3333
3334(P) An internal error.
3335
c99a1475
NC
3336=item panic: attempt to call %s in %s
3337
3338(P) One of the file test operators entered a code branch that calls
3339an ACL related-function, but that function is not available on this
3340platform. Earlier checks mean that it should not be possible to
3341enter this branch on this platform.
3342
a0d0e21e
LW
3343=item panic: ck_grep
3344
3345(P) Failed an internal consistency check trying to compile a grep.
3346
3347=item panic: ck_split
3348
3349(P) Failed an internal consistency check trying to compile a split.
3350
3351=item panic: corrupt saved stack index
3352