This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
perldiag.pod
[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).
11 (D) A deprecation (optional).
e476b1b5 12 (S) A severe warning (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
30Default warnings are always enabled unless they are explicitly disabled
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
6df41af2 53=item Allocation too large: %lx
a0d0e21e 54
6df41af2 55(X) You can't allocate more than 64K on an MS-DOS machine.
a0d0e21e 56
f61d411c 57=item '!' allowed only after types %s
ef54e1a4 58
f61d411c
JH
59(F) The '!' is allowed in pack() and unpack() only after certain types.
60See 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
c2e66d9e
GS
79=item Ambiguous range in transliteration operator
80
81(F) You wrote something like C<tr/a-z-0//> which doesn't mean anything at
82all. To include a C<-> character in a transliteration, put it either
83first or last. (In the past, C<tr/a-z-0//> was synonymous with
84C<tr/a-y//>, which was probably not what you would have expected.)
85
6df41af2 86=item Ambiguous use of %s resolved as %s
43192e07 87
6df41af2
GS
88(W ambiguous)(S) You said something that may not be interpreted the way
89you thought. Normally it's pretty easy to disambiguate it by supplying
90a missing quote, operator, parenthesis pair or declaration.
a0d0e21e 91
6df41af2 92=item '|' and '<' may not both be specified on command line
a0d0e21e 93
be771a83
GS
94(F) An error peculiar to VMS. Perl does its own command line
95redirection, and found that STDIN was a pipe, and that you also tried to
96redirect STDIN using '<'. Only one STDIN stream to a customer, please.
c9f97d15 97
6df41af2 98=item '|' and '>' may not both be specified on command line
1028017a 99
be771a83
GS
100(F) An error peculiar to VMS. Perl does its own command line
101redirection, and thinks you tried to redirect stdout both to a file and
102into a pipe to another command. You need to choose one or the other,
103though nothing's stopping you from piping into a program or Perl script
104which 'splits' output into two streams, such as
1028017a 105
6df41af2
GS
106 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
107 while (<STDIN>) {
108 print;
109 print OUT;
110 }
111 close OUT;
c9f97d15 112
6df41af2 113=item Applying %s to %s will act on scalar(%s)
eb6e2d6f 114
496a33f5
SC
115(W misc) The pattern match (C<//>), substitution (C<s///>), and
116transliteration (C<tr///>) operators work on scalar values. If you apply
be771a83
GS
117one of them to an array or a hash, it will convert the array or hash to
118a scalar value -- the length of an array, or the population info of a
119hash -- and then work on that scalar value. This is probably not what
120you meant to do. See L<perlfunc/grep> and L<perlfunc/map> for
121alternatives.
eb6e2d6f 122
6df41af2 123=item Args must match #! line
a0d0e21e 124
6df41af2
GS
125(F) The setuid emulator requires that the arguments Perl was invoked
126with match the arguments specified on the #! line. Since some systems
127impose a one-argument limit on the #! line, try combining switches;
128for example, turn C<-w -U> into C<-wU>.
a0d0e21e 129
6df41af2 130=item Arg too short for msgsnd
76cd736e 131
6df41af2 132(F) msgsnd() requires a string at least as long as sizeof(long).
76cd736e 133
8ea97a1e 134=item %s argument is not a HASH or ARRAY element
a0d0e21e 135
8ea97a1e 136(F) The argument to exists() must be a hash or array element, such as:
a0d0e21e
LW
137
138 $foo{$bar}
cb4f522a 139 $ref->{"susie"}[12]
a0d0e21e 140
8ea97a1e 141=item %s argument is not a HASH or ARRAY element or slice
5f05dabc 142
be771a83
GS
143(F) The argument to delete() must be either a hash or array element,
144such as:
5f05dabc
PP
145
146 $foo{$bar}
cb4f522a 147 $ref->{"susie"}[12]
5f05dabc 148
8ea97a1e 149or a hash or array slice, such as:
5f05dabc 150
6df41af2
GS
151 @foo[$bar, $baz, $xyzzy]
152 @{$ref->[12]}{"susie", "queue"}
5315574d 153
6df41af2 154=item %s argument is not a subroutine name
a0d0e21e 155
6df41af2 156(F) The argument to exists() for C<exists &sub> must be a subroutine
be771a83
GS
157name, and not a subroutine call. C<exists &sub()> will generate this
158error.
a0d0e21e 159
f86702cc 160=item Argument "%s" isn't numeric%s
a0d0e21e 161
be771a83
GS
162(W numeric) The indicated string was fed as an argument to an operator
163that expected a numeric value instead. If you're fortunate the message
164will identify which operator was so unfortunate.
a0d0e21e
LW
165
166=item Array @%s missing the @ in argument %d of %s()
167
75b44862
GS
168(D deprecated) Really old Perl let you omit the @ on array names in some
169spots. This is now heavily deprecated.
a0d0e21e
LW
170
171=item assertion botched: %s
172
173(P) The malloc package that comes with Perl had an internal failure.
174
175=item Assertion failed: file "%s"
176
177(P) A general assertion failed. The file in question must be examined.
178
179=item Assignment to both a list and a scalar
180
181(F) If you assign to a conditional operator, the 2nd and 3rd arguments
182must either both be scalars or both be lists. Otherwise Perl won't
183know which context to supply to the right side.
184
5243b939 185=item Negative offset to vec in lvalue context
fe58ced6 186
496a33f5 187(F) When C<vec> is called in an lvalue context, the second argument must be
5243b939 188greater than or equal to zero.
fe58ced6 189
81689caa
HS
190=item Attempt to bless into a reference
191
192(F) The CLASSNAME argument to the bless() operator is expected to be
193the name of the package to bless the resulting object into. You've
194supplied instead a reference to something: perhaps you wrote
195
196 bless $self, $proto;
197
198when you intended
199
200 bless $self, ref($proto) || $proto;
201
202If you actually want to bless into the stringified version
203of the reference supplied, you need to stringify it yourself, for
204example by:
205
206 bless $self, "$proto";
207
a0d0e21e
LW
208=item Attempt to free non-arena SV: 0x%lx
209
be771a83
GS
210(P internal) All SV objects are supposed to be allocated from arenas
211that will be garbage collected on exit. An SV was discovered to be
212outside any of those arenas.
a0d0e21e 213
54310121 214=item Attempt to free nonexistent shared string
bbce6d69 215
be771a83
GS
216(P internal) Perl maintains a reference counted internal table of
217strings to optimize the storage and access of hash keys and other
218strings. This indicates someone tried to decrement the reference count
219of a string that can no longer be found in the table.
bbce6d69 220
a0d0e21e
LW
221=item Attempt to free temp prematurely
222
be771a83
GS
223(W debugging) Mortalized values are supposed to be freed by the
224free_tmps() routine. This indicates that something else is freeing the
225SV before the free_tmps() routine gets a chance, which means that the
226free_tmps() routine will be freeing an unreferenced scalar when it does
227try to free it.
a0d0e21e
LW
228
229=item Attempt to free unreferenced glob pointers
230
e476b1b5 231(P internal) The reference counts got screwed up on symbol aliases.
a0d0e21e
LW
232
233=item Attempt to free unreferenced scalar
234
be771a83
GS
235(W internal) Perl went to decrement the reference count of a scalar to
236see if it would go to 0, and discovered that it had already gone to 0
237earlier, and should have been freed, and in fact, probably was freed.
238This could indicate that SvREFCNT_dec() was called too many times, or
239that SvREFCNT_inc() was called too few times, or that the SV was
240mortalized when it shouldn't have been, or that memory has been
241corrupted.
a0d0e21e 242
dcdda58d
GS
243=item Attempt to join self
244
245(F) You tried to join a thread from within itself, which is an
be771a83
GS
246impossible task. You may be joining the wrong thread, or you may need
247to move the join() to some other thread.
dcdda58d 248
84902520
TB
249=item Attempt to pack pointer to temporary value
250
be771a83
GS
251(W pack) You tried to pass a temporary value (like the result of a
252function, or a computed expression) to the "p" pack() template. This
253means the result contains a pointer to a location that could become
254invalid anytime, even before the end of the current statement. Use
255literals or global values as arguments to the "p" pack() template to
256avoid this warning.
84902520 257
b7a902f4
PP
258=item Attempt to use reference as lvalue in substr
259
be771a83
GS
260(W substr) You supplied a reference as the first argument to substr()
261used as an lvalue, which is pretty strange. Perhaps you forgot to
262dereference it first. See L<perlfunc/substr>.
b7a902f4 263
dc26df50 264=item Bad arg length for %s, is %d, should be %s
a0d0e21e 265
be771a83
GS
266(F) You passed a buffer of the wrong size to one of msgctl(), semctl()
267or shmctl(). In C parlance, the correct sizes are, respectively,
5f05dabc 268S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and
a0d0e21e
LW
269S<sizeof(struct shmid_ds *)>.
270
7a95317d
GS
271=item Bad evalled substitution pattern
272
496a33f5 273(F) You've used the C</e> switch to evaluate the replacement for a
7a95317d
GS
274substitution, but perl found a syntax error in the code to evaluate,
275most likely an unexpected right brace '}'.
276
a0d0e21e
LW
277=item Bad filehandle: %s
278
be771a83
GS
279(F) A symbol was passed to something wanting a filehandle, but the
280symbol has no filehandle associated with it. Perhaps you didn't do an
281open(), or did it in another package.
a0d0e21e
LW
282
283=item Bad free() ignored
284
be771a83
GS
285(S malloc) An internal routine called free() on something that had never
286been malloc()ed in the first place. Mandatory, but can be disabled by
9ea8bc6d 287setting environment variable C<PERL_BADFREE> to 0.
33c8a3fe 288
9ea8bc6d 289This message can be seen quite often with DB_File on systems with "hard"
be771a83
GS
290dynamic linking, like C<AIX> and C<OS/2>. It is a bug of C<Berkeley DB>
291which is left unnoticed if C<DB> uses I<forgiving> system malloc().
a0d0e21e 292
aa689395
PP
293=item Bad hash
294
295(P) One of the internal hash routines was passed a null HV pointer.
296
f1192cee
GA
297=item Bad index while coercing array into hash
298
6f54a448
GS
299(F) The index looked up in the hash found as the 0'th element of a
300pseudo-hash is not legal. Index values must be at 1 or greater.
301See L<perlref>.
57079c46 302
6df41af2
GS
303=item Badly placed ()'s
304
305(A) You've accidentally run your script through B<csh> instead
306of Perl. Check the #! line, or manually feed your script into
307Perl yourself.
308
a0d0e21e
LW
309=item Bad name after %s::
310
be771a83
GS
311(F) You started to name a symbol by using a package prefix, and then
312didn't finish the symbol. In particular, you can't interpolate outside
313of quotes, so
a0d0e21e
LW
314
315 $var = 'myvar';
316 $sym = mypack::$var;
317
318is not the same as
319
320 $var = 'myvar';
321 $sym = "mypack::$var";
322
4ad56ec9
IZ
323=item Bad realloc() ignored
324
be771a83
GS
325(S malloc) An internal routine called realloc() on something that had
326never been malloc()ed in the first place. Mandatory, but can be disabled
327by setting environment variable C<PERL_BADFREE> to 1.
4ad56ec9 328
a0d0e21e
LW
329=item Bad symbol for array
330
331(P) An internal request asked to add an array entry to something that
332wasn't a symbol table entry.
333
334=item Bad symbol for filehandle
335
be771a83
GS
336(P) An internal request asked to add a filehandle entry to something
337that wasn't a symbol table entry.
a0d0e21e
LW
338
339=item Bad symbol for hash
340
341(P) An internal request asked to add a hash entry to something that
342wasn't a symbol table entry.
343
34d09196
GS
344=item Bareword found in conditional
345
be771a83
GS
346(W bareword) The compiler found a bareword where it expected a
347conditional, which often indicates that an || or && was parsed as part
348of the last argument of the previous construct, for example:
34d09196
GS
349
350 open FOO || die;
351
be771a83
GS
352It may also indicate a misspelled constant that has been interpreted as
353a bareword:
34d09196
GS
354
355 use constant TYPO => 1;
356 if (TYOP) { print "foo" }
357
358The C<strict> pragma is useful in avoiding such errors.
359
6df41af2
GS
360=item Bareword "%s" not allowed while "strict subs" in use
361
362(F) With "strict subs" in use, a bareword is only allowed as a
be771a83
GS
363subroutine identifier, in curly brackets or to the left of the "=>"
364symbol. Perhaps you need to predeclare a subroutine?
6df41af2
GS
365
366=item Bareword "%s" refers to nonexistent package
367
be771a83
GS
368(W bareword) You used a qualified bareword of the form C<Foo::>, but the
369compiler saw no other uses of that namespace before that point. Perhaps
370you need to predeclare a package?
6df41af2 371
a0d0e21e
LW
372=item BEGIN failed--compilation aborted
373
be771a83
GS
374(F) An untrapped exception was raised while executing a BEGIN
375subroutine. Compilation stops immediately and the interpreter is
376exited.
a0d0e21e 377
68dc0745
PP
378=item BEGIN not safe after errors--compilation aborted
379
380(F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which
be771a83
GS
381implies a C<BEGIN {}>) after one or more compilation errors had already
382occurred. Since the intended environment for the C<BEGIN {}> could not
383be guaranteed (due to the errors), and since subsequent code likely
384depends on its correct operation, Perl just gave up.
68dc0745 385
6df41af2
GS
386=item \1 better written as $1
387
be771a83
GS
388(W syntax) Outside of patterns, backreferences live on as variables.
389The use of backslashes is grandfathered on the right-hand side of a
390substitution, but stylistically it's better to use the variable form
391because other Perl programmers will expect it, and it works better if
392there are more than 9 backreferences.
6df41af2 393
252aa082
JH
394=item Binary number > 0b11111111111111111111111111111111 non-portable
395
e476b1b5 396(W portable) The binary number you specified is larger than 2**32-1
9e24b6e2
JH
397(4294967295) and therefore non-portable between systems. See
398L<perlport> for more on portability concerns.
252aa082 399
69282e91 400=item bind() on closed socket %s
a0d0e21e 401
be771a83
GS
402(W closed) You tried to do a bind on a closed socket. Did you forget to
403check the return value of your socket() call? See L<perlfunc/bind>.
a0d0e21e 404
c289d2f7
JH
405=item binmode() on closed filehandle %s
406
407(W unopened) You tried binmode() on a filehandle that was never opened.
408Check you control flow and number of arguments.
409
c5a0f51a
JH
410=item Bit vector size > 32 non-portable
411
e476b1b5 412(W portable) Using bit vector sizes larger than 32 is non-portable.
c5a0f51a 413
4633a7c4
LW
414=item Bizarre copy of %s in %s
415
be771a83 416(P) Perl detected an attempt to copy an internal value that is not
b45f050a 417copyable.
4633a7c4 418
6df41af2
GS
419=item B<-P> not allowed for setuid/setgid script
420
421(F) The script would have to be opened by the C preprocessor by name,
422which provides a race condition that breaks security.
423
f675dbe5
CB
424=item Buffer overflow in prime_env_iter: %s
425
be771a83
GS
426(W internal) A warning peculiar to VMS. While Perl was preparing to
427iterate over %ENV, it encountered a logical name or symbol definition
428which was too long, so it was truncated to the string shown.
f675dbe5 429
a0d0e21e
LW
430=item Callback called exit
431
4929bf7b 432(F) A subroutine invoked from an external package via call_sv()
a0d0e21e
LW
433exited by calling exit.
434
6df41af2 435=item %s() called too early to check prototype
f675dbe5 436
be771a83
GS
437(W prototype) You've called a function that has a prototype before the
438parser saw a definition or declaration for it, and Perl could not check
439that the call conforms to the prototype. You need to either add an
440early prototype declaration for the subroutine in question, or move the
441subroutine definition ahead of the call to get proper prototype
442checking. Alternatively, if you are certain that you're calling the
443function correctly, you may put an ampersand before the name to avoid
444the warning. See L<perlsub>.
f675dbe5 445
6df41af2 446=item / cannot take a count
a0d0e21e 447
be771a83
GS
448(F) You had an unpack template indicating a counted-length string, but
449you have also specified an explicit size for the string. See
450L<perlfunc/pack>.
a0d0e21e
LW
451
452=item Can't bless non-reference value
453
454(F) Only hard references may be blessed. This is how Perl "enforces"
455encapsulation of objects. See L<perlobj>.
456
a0d0e21e
LW
457=item Can't call method "%s" in empty package "%s"
458
459(F) You called a method correctly, and it correctly indicated a package
460functioning as a class, but that package doesn't have ANYTHING defined
461in it, let alone methods. See L<perlobj>.
462
6df41af2
GS
463=item Can't call method "%s" on an undefined value
464
465(F) You used the syntax of a method call, but the slot filled by the
be771a83
GS
466object reference or package name contains an undefined value. Something
467like this will reproduce the error:
6df41af2
GS
468
469 $BADREF = undef;
470 process $BADREF 1,2,3;
471 $BADREF->process(1,2,3);
472
a0d0e21e
LW
473=item Can't call method "%s" on unblessed reference
474
54310121 475(F) A method call must know in what package it's supposed to run. It
be771a83
GS
476ordinarily finds this out from the object reference you supply, but you
477didn't supply an object reference in this case. A reference isn't an
478object reference until it has been blessed. See L<perlobj>.
a0d0e21e
LW
479
480=item Can't call method "%s" without a package or object reference
481
482(F) You used the syntax of a method call, but the slot filled by the
be771a83
GS
483object reference or package name contains an expression that returns a
484defined value which is neither an object reference nor a package name.
72b5445b
GS
485Something like this will reproduce the error:
486
487 $BADREF = 42;
488 process $BADREF 1,2,3;
489 $BADREF->process(1,2,3);
490
a0d0e21e
LW
491=item Can't chdir to %s
492
493(F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
494that you can chdir to, possibly because it doesn't exist.
495
0545a864 496=item Can't check filesystem of script "%s" for nosuid
104d25b7 497
be771a83
GS
498(P) For some reason you can't check the filesystem of the script for
499nosuid.
104d25b7 500
6df41af2
GS
501=item Can't coerce array into hash
502
503(F) You used an array where a hash was expected, but the array has no
504information on how to map from keys to array indices. You can do that
505only with arrays that have a hash reference at index 0.
506
a0d0e21e
LW
507=item Can't coerce %s to integer in %s
508
509(F) Certain types of SVs, in particular real symbol table entries
55497cff 510(typeglobs), can't be forced to stop being what they are. So you can't
a0d0e21e
LW
511say things like:
512
513 *foo += 1;
514
515You CAN say
516
517 $foo = *foo;
518 $foo += 1;
519
520but then $foo no longer contains a glob.
521
522=item Can't coerce %s to number in %s
523
524(F) Certain types of SVs, in particular real symbol table entries
55497cff 525(typeglobs), can't be forced to stop being what they are.
a0d0e21e
LW
526
527=item Can't coerce %s to string in %s
528
529(F) Certain types of SVs, in particular real symbol table entries
55497cff 530(typeglobs), can't be forced to stop being what they are.
a0d0e21e
LW
531
532=item Can't create pipe mailbox
533
be771a83
GS
534(P) An error peculiar to VMS. The process is suffering from exhausted
535quotas or other plumbing problems.
a0d0e21e 536
eb64745e 537=item Can't declare class for non-scalar %s in "%s"
a0d0e21e 538
eb64745e
GS
539(S) Currently, only scalar variables can declared with a specific class
540qualifier in a "my" or "our" declaration. The semantics may be extended
541for other types of variables in future.
542
543=item Can't declare %s in "%s"
544
545(F) Only scalar, array, and hash variables may be declared as "my" or
546"our" variables. They must have ordinary identifiers as names.
a0d0e21e 547
6df41af2
GS
548=item Can't do inplace edit: %s is not a regular file
549
be771a83
GS
550(S inplace) You tried to use the B<-i> switch on a special file, such as
551a file in /dev, or a FIFO. The file was ignored.
6df41af2 552
a0d0e21e
LW
553=item Can't do inplace edit on %s: %s
554
be771a83
GS
555(S inplace) The creation of the new file failed for the indicated
556reason.
a0d0e21e 557
54310121 558=item Can't do inplace edit without backup
a0d0e21e 559
be771a83
GS
560(F) You're on a system such as MS-DOS that gets confused if you try
561reading from a deleted (but still opened) file. You have to say
562C<-i.bak>, or some such.
a0d0e21e 563
10f9c03d 564=item Can't do inplace edit: %s would not be unique
a0d0e21e 565
e476b1b5 566(S inplace) Your filesystem does not support filenames longer than 14
10f9c03d
CK
567characters and Perl was unable to create a unique filename during
568inplace editing with the B<-i> switch. The file was ignored.
a0d0e21e 569
7253e4e3 570=item Can't do {n,m} with n > m in regex; marked by <-- HERE in m/%s/
a0d0e21e 571
b45f050a 572(F) Minima must be less than or equal to maxima. If you really want your
7253e4e3 573regexp to match something 0 times, just put {0}. The <-- HERE shows in the
b45f050a 574regular expression about where the problem was discovered. See L<perlre>.
a0d0e21e
LW
575
576=item Can't do setegid!
577
be771a83
GS
578(P) The setegid() call failed for some reason in the setuid emulator of
579suidperl.
a0d0e21e
LW
580
581=item Can't do seteuid!
582
583(P) The setuid emulator of suidperl failed for some reason.
584
585=item Can't do setuid
586
be771a83
GS
587(F) This typically means that ordinary perl tried to exec suidperl to do
588setuid emulation, but couldn't exec it. It looks for a name of the form
589sperl5.000 in the same directory that the perl executable resides under
590the name perl5.000, typically /usr/local/bin on Unix machines. If the
591file is there, check the execute permissions. If it isn't, ask your
592sysadmin why he and/or she removed it.
a0d0e21e
LW
593
594=item Can't do waitpid with flags
595
be771a83
GS
596(F) This machine doesn't have either waitpid() or wait4(), so only
597waitpid() without flags is emulated.
a0d0e21e 598
a0d0e21e
LW
599=item Can't emulate -%s on #! line
600
be771a83
GS
601(F) The #! line specifies a switch that doesn't make sense at this
602point. For example, it'd be kind of silly to put a B<-x> on the #!
603line.
a0d0e21e
LW
604
605=item Can't exec "%s": %s
606
be771a83
GS
607(W exec) An system(), exec(), or piped open call could not execute the
608named program for the indicated reason. Typical reasons include: the
609permissions were wrong on the file, the file wasn't found in
610C<$ENV{PATH}>, the executable in question was compiled for another
611architecture, or the #! line in a script points to an interpreter that
612can't be run for similar reasons. (Or maybe your system doesn't support
613#! at all.)
a0d0e21e
LW
614
615=item Can't exec %s
616
be771a83
GS
617(F) Perl was trying to execute the indicated program for you because
618that's what the #! line said. If that's not what you wanted, you may
619need to mention "perl" on the #! line somewhere.
a0d0e21e
LW
620
621=item Can't execute %s
622
be771a83
GS
623(F) You used the B<-S> switch, but the copies of the script to execute
624found in the PATH did not have correct permissions.
2a92aaa0 625
6df41af2 626=item Can't find an opnumber for "%s"
2a92aaa0 627
be771a83
GS
628(F) A string of a form C<CORE::word> was given to prototype(), but there
629is no builtin with the name C<word>.
6df41af2 630
56ca2fc0
JH
631=item Can't find %s character property "%s"
632
633(F) You used C<\p{}> or C<\P{}> but the character property by that name
89d60977 634could not be found. Maybe you misspelled the name of the property
56ca2fc0
JH
635(remember that the names of character properties consist only of
636alphanumeric characters), or maybe you forgot the C<Is> or C<In> prefix?
637
6df41af2
GS
638=item Can't find label %s
639
be771a83
GS
640(F) You said to goto a label that isn't mentioned anywhere that it's
641possible for us to go to. See L<perlfunc/goto>.
2a92aaa0
GS
642
643=item Can't find %s on PATH
644
be771a83
GS
645(F) You used the B<-S> switch, but the script to execute could not be
646found in the PATH.
a0d0e21e 647
6df41af2 648=item Can't find %s on PATH, '.' not in PATH
a0d0e21e 649
be771a83
GS
650(F) You used the B<-S> switch, but the script to execute could not be
651found in the PATH, or at least not with the correct permissions. The
652script exists in the current directory, but PATH prohibits running it.
a0d0e21e
LW
653
654=item Can't find string terminator %s anywhere before EOF
655
be771a83
GS
656(F) Perl strings can stretch over multiple lines. This message means
657that the closing delimiter was omitted. Because bracketed quotes count
658nesting levels, the following is missing its final parenthesis:
a0d0e21e 659
fb73857a
PP
660 print q(The character '(' starts a side comment.);
661
be771a83
GS
662If you're getting this error from a here-document, you may have included
663unseen whitespace before or after your closing tag. A good programmer's
664editor will have a way to help you find these characters.
a0d0e21e 665
64977eb6 666=item Can't find %s property definition %s
0103b764 667
f91328b7
JH
668(F) You may have tried to use C<\p> which means a Unicode property for
669example \p{Lu} is all uppercase letters. Escape the C<\p>, either
670C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
671possible C<\E>).
0103b764 672
a0d0e21e
LW
673=item Can't fork
674
be771a83
GS
675(F) A fatal error occurred while trying to fork while opening a
676pipeline.
a0d0e21e 677
748a9306
LW
678=item Can't get filespec - stale stat buffer?
679
be771a83
GS
680(S) A warning peculiar to VMS. This arises because of the difference
681between access checks under VMS and under the Unix model Perl assumes.
682Under VMS, access checks are done by filename, rather than by bits in
683the stat buffer, so that ACLs and other protections can be taken into
684account. Unfortunately, Perl assumes that the stat buffer contains all
685the necessary information, and passes it, instead of the filespec, to
686the access checking routine. It will try to retrieve the filespec using
687the device name and FID present in the stat buffer, but this works only
688if you haven't made a subsequent call to the CRTL stat() routine,
689because the device name is overwritten with each call. If this warning
690appears, the name lookup failed, and the access checking routine gave up
691and returned FALSE, just to be conservative. (Note: The access checking
692routine knows about the Perl C<stat> operator and file tests, so you
693shouldn't ever see this warning in response to a Perl command; it arises
694only if some internal code takes stat buffers lightly.)
748a9306 695
a0d0e21e
LW
696=item Can't get pipe mailbox device name
697
be771a83
GS
698(P) An error peculiar to VMS. After creating a mailbox to act as a
699pipe, Perl can't retrieve its name for later use.
a0d0e21e
LW
700
701=item Can't get SYSGEN parameter value for MAXBUF
702
748a9306
LW
703(P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
704mailbox buffers to be, and didn't get an answer.
a0d0e21e 705
6df41af2 706=item Can't "goto" into the middle of a foreach loop
a0d0e21e 707
be771a83
GS
708(F) A "goto" statement was executed to jump into the middle of a foreach
709loop. You can't get there from here. See L<perlfunc/goto>.
6df41af2
GS
710
711=item Can't "goto" out of a pseudo block
712
be771a83
GS
713(F) A "goto" statement was executed to jump out of what might look like
714a block, except that it isn't a proper block. This usually occurs if
715you tried to jump out of a sort() block or subroutine, which is a no-no.
716See L<perlfunc/goto>.
a0d0e21e 717
b150fb22
RH
718=item Can't goto subroutine from an eval-string
719
be771a83
GS
720(F) The "goto subroutine" call can't be used to jump out of an eval
721"string". (You can use it to jump out of an eval {BLOCK}, but you
722probably don't want to.)
b150fb22 723
6df41af2
GS
724=item Can't goto subroutine outside a subroutine
725
be771a83
GS
726(F) The deeply magical "goto subroutine" call can only replace one
727subroutine call for another. It can't manufacture one out of whole
728cloth. In general you should be calling it out of only an AUTOLOAD
729routine anyway. See L<perlfunc/goto>.
6df41af2 730
0b5b802d
GS
731=item Can't ignore signal CHLD, forcing to default
732
be771a83
GS
733(W signal) Perl has detected that it is being run with the SIGCHLD
734signal (sometimes known as SIGCLD) disabled. Since disabling this
735signal will interfere with proper determination of exit status of child
736processes, Perl has reset the signal to its default value. This
737situation typically indicates that the parent program under which Perl
738may be running (e.g. cron) is being very careless.
0b5b802d 739
6df41af2 740=item Can't "last" outside a loop block
4633a7c4 741
6df41af2 742(F) A "last" statement was executed to break out of the current block,
be771a83
GS
743except that there's this itty bitty problem called there isn't a current
744block. Note that an "if" or "else" block doesn't count as a "loopish"
745block, as doesn't a block given to sort(), map() or grep(). You can
746usually double the curlies to get the same effect though, because the
747inner curlies will be considered a block that loops once. See
748L<perlfunc/last>.
4633a7c4 749
748a9306
LW
750=item Can't localize lexical variable %s
751
2ba9eb46 752(F) You used local on a variable name that was previously declared as a
748a9306
LW
753lexical variable using "my". This is not allowed. If you want to
754localize a package variable of the same name, qualify it with the
755package name.
756
0ebe0038
SM
757=item Can't localize pseudo-hash element
758
be771a83
GS
759(F) You said something like C<< local $ar->{'key'} >>, where $ar is a
760reference to a pseudo-hash. That hasn't been implemented yet, but you
761can get a similar effect by localizing the corresponding array element
762directly -- C<< local $ar->[$ar->[0]{'key'}] >>.
0ebe0038 763
6df41af2 764=item Can't localize through a reference
4727527e 765
6df41af2
GS
766(F) You said something like C<local $$ref>, which Perl can't currently
767handle, because when it goes to restore the old value of whatever $ref
be771a83 768pointed to after the scope of the local() is finished, it can't be sure
64977eb6 769that $ref will still be a reference.
4727527e 770
ec889f3a
GS
771=item Can't locate %s
772
773(F) You said to C<do> (or C<require>, or C<use>) a file that couldn't be
774found. Perl looks for the file in all the locations mentioned in @INC,
be771a83
GS
775unless the file name included the full path to the file. Perhaps you
776need to set the PERL5LIB or PERL5OPT environment variable to say where
777the extra library is, or maybe the script needs to add the library name
778to @INC. Or maybe you just misspelled the name of the file. See
779L<perlfunc/require> and L<lib>.
a0d0e21e 780
6df41af2
GS
781=item Can't locate auto/%s.al in @INC
782
be771a83
GS
783(F) A function (or method) was called in a package which allows
784autoload, but there is no function to autoload. Most probable causes
785are a misprint in a function/method name or a failure to C<AutoSplit>
786the file, say, by doing C<make install>.
6df41af2 787
a0d0e21e
LW
788=item Can't locate object method "%s" via package "%s"
789
790(F) You called a method correctly, and it correctly indicated a package
791functioning as a class, but that package doesn't define that particular
2ba9eb46 792method, nor does any of its base classes. See L<perlobj>.
a0d0e21e 793
c1899e02
GS
794=item (perhaps you forgot to load "%s"?)
795
796(F) This is an educated guess made in conjunction with the message
797"Can't locate object method \"%s\" via package \"%s\"". It often means
798that a method requires a package that has not been loaded.
799
a0d0e21e
LW
800=item Can't locate package %s for @%s::ISA
801
be771a83
GS
802(W syntax) The @ISA array contained the name of another package that
803doesn't seem to exist.
a0d0e21e 804
3e3baf6d
TB
805=item Can't make list assignment to \%ENV on this system
806
be771a83
GS
807(F) List assignment to %ENV is not supported on some systems, notably
808VMS.
3e3baf6d 809
a0d0e21e
LW
810=item Can't modify %s in %s
811
be771a83
GS
812(F) You aren't allowed to assign to the item indicated, or otherwise try
813to change it, such as with an auto-increment.
a0d0e21e 814
54310121 815=item Can't modify nonexistent substring
a0d0e21e
LW
816
817(P) The internal routine that does assignment to a substr() was handed
818a NULL.
819
6df41af2
GS
820=item Can't modify non-lvalue subroutine call
821
822(F) Subroutines meant to be used in lvalue context should be declared as
823such, see L<perlsub/"Lvalue subroutines">.
824
5f05dabc 825=item Can't msgrcv to read-only var
a0d0e21e 826
5f05dabc 827(F) The target of a msgrcv must be modifiable to be used as a receive
a0d0e21e
LW
828buffer.
829
6df41af2
GS
830=item Can't "next" outside a loop block
831
832(F) A "next" statement was executed to reiterate the current block, but
833there isn't a current block. Note that an "if" or "else" block doesn't
be771a83
GS
834count as a "loopish" block, as doesn't a block given to sort(), map() or
835grep(). You can usually double the curlies to get the same effect
836though, because the inner curlies will be considered a block that loops
837once. See L<perlfunc/next>.
6df41af2 838
a0d0e21e
LW
839=item Can't open %s: %s
840
c47ff5f1 841(S inplace) The implicit opening of a file through use of the C<< <> >>
08e9d68e
DD
842filehandle, either implicitly under the C<-n> or C<-p> command-line
843switches, or explicitly, failed for the indicated reason. Usually this
be771a83
GS
844is because you don't have read permission for a file which you named on
845the command line.
a0d0e21e
LW
846
847=item Can't open bidirectional pipe
848
be771a83
GS
849(W pipe) You tried to say C<open(CMD, "|cmd|")>, which is not supported.
850You can try any of several modules in the Perl library to do this, such
851as IPC::Open2. Alternately, direct the pipe's output to a file using
852">", and then read it in under a different file handle.
a0d0e21e 853
748a9306
LW
854=item Can't open error file %s as stderr
855
be771a83
GS
856(F) An error peculiar to VMS. Perl does its own command line
857redirection, and couldn't open the file specified after '2>' or '2>>' on
858the command line for writing.
748a9306
LW
859
860=item Can't open input file %s as stdin
861
be771a83
GS
862(F) An error peculiar to VMS. Perl does its own command line
863redirection, and couldn't open the file specified after '<' on the
864command line for reading.
748a9306
LW
865
866=item Can't open output file %s as stdout
867
be771a83
GS
868(F) An error peculiar to VMS. Perl does its own command line
869redirection, and couldn't open the file specified after '>' or '>>' on
870the command line for writing.
748a9306
LW
871
872=item Can't open output pipe (name: %s)
873
be771a83
GS
874(P) An error peculiar to VMS. Perl does its own command line
875redirection, and couldn't open the pipe into which to send data destined
876for stdout.
748a9306 877
584d69ec 878=item Can't open perl script%s: %s
a0d0e21e
LW
879
880(F) The script you specified can't be opened for the indicated reason.
881
6df41af2
GS
882=item Can't read CRTL environ
883
884(S) A warning peculiar to VMS. Perl tried to read an element of %ENV
885from the CRTL's internal environment array and discovered the array was
886missing. You need to figure out where your CRTL misplaced its environ
be771a83
GS
887or define F<PERL_ENV_TABLES> (see L<perlvms>) so that environ is not
888searched.
6df41af2 889
7bac28a0
PP
890=item Can't redefine active sort subroutine %s
891
892(F) Perl optimizes the internal handling of sort subroutines and keeps
be771a83
GS
893pointers into them. You tried to redefine one such sort subroutine when
894it was currently active, which is not allowed. If you really want to do
7bac28a0
PP
895this, you should write C<sort { &func } @x> instead of C<sort func @x>.
896
6df41af2
GS
897=item Can't "redo" outside a loop block
898
899(F) A "redo" statement was executed to restart the current block, but
900there isn't a current block. Note that an "if" or "else" block doesn't
901count as a "loopish" block, as doesn't a block given to sort(), map()
902or grep(). You can usually double the curlies to get the same effect
903though, because the inner curlies will be considered a block that
904loops once. See L<perlfunc/redo>.
905
64977eb6 906=item Can't remove %s: %s, skipping file
10f9c03d 907
be771a83
GS
908(S inplace) You requested an inplace edit without creating a backup
909file. Perl was unable to remove the original file to replace it with
910the modified file. The file was left unmodified.
10f9c03d 911
a0d0e21e
LW
912=item Can't rename %s to %s: %s, skipping file
913
e476b1b5 914(S inplace) The rename done by the B<-i> switch failed for some reason,
10f9c03d 915probably because you don't have write permission to the directory.
a0d0e21e 916
748a9306
LW
917=item Can't reopen input pipe (name: %s) in binary mode
918
be771a83
GS
919(P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried
920to reopen it to accept binary data. Alas, it failed.
748a9306 921
6df41af2
GS
922=item Can't resolve method `%s' overloading `%s' in package `%s'
923
be771a83
GS
924(F|P) Error resolving overloading specified by a method name (as opposed
925to a subroutine reference): no such method callable via the package. If
926method name is C<???>, this is an internal error.
6df41af2 927
a0d0e21e
LW
928=item Can't reswap uid and euid
929
be771a83
GS
930(P) The setreuid() call failed for some reason in the setuid emulator of
931suidperl.
a0d0e21e 932
cd06dffe
GS
933=item Can't return %s from lvalue subroutine
934
be771a83
GS
935(F) Perl detected an attempt to return illegal lvalues (such as
936temporary or readonly values) from a subroutine used as an lvalue. This
937is not allowed.
cd06dffe 938
78f9721b
SM
939=item Can't return %s to lvalue scalar context
940
941(F) You tried to return a complete array or hash from an lvalue subroutine,
942but you called the subroutine in a way that made Perl think you meant
943to return only one value. You probably meant to write parentheses around
944the call to the subroutine, which tell Perl that the call should be in
945list context.
946
6df41af2
GS
947=item Can't return outside a subroutine
948
949(F) The return statement was executed in mainline code, that is, where
950there was no subroutine call to return out of. See L<perlsub>.
951
a0d0e21e
LW
952=item Can't stat script "%s"
953
be771a83
GS
954(P) For some reason you can't fstat() the script even though you have it
955open already. Bizarre.
a0d0e21e
LW
956
957=item Can't swap uid and euid
958
be771a83
GS
959(P) The setreuid() call failed for some reason in the setuid emulator of
960suidperl.
a0d0e21e
LW
961
962=item Can't take log of %g
963
fb73857a
PP
964(F) For ordinary real numbers, you can't take the logarithm of a
965negative number or zero. There's a Math::Complex package that comes
be771a83
GS
966standard with Perl, though, if you really want to do that for the
967negative numbers.
a0d0e21e
LW
968
969=item Can't take sqrt of %g
970
971(F) For ordinary real numbers, you can't take the square root of a
fb73857a
PP
972negative number. There's a Math::Complex package that comes standard
973with Perl, though, if you really want to do that.
a0d0e21e
LW
974
975=item Can't undef active subroutine
976
977(F) You can't undefine a routine that's currently running. You can,
978however, redefine it while it's running, and you can even undef the
979redefined subroutine while the old routine is running. Go figure.
980
981=item Can't unshift
982
983(F) You tried to unshift an "unreal" array that can't be unshifted, such
984as the main Perl stack.
985
986=item Can't upgrade that kind of scalar
987
be771a83
GS
988(P) The internal sv_upgrade routine adds "members" to an SV, making it
989into a more specialized kind of SV. The top several SV types are so
990specialized, however, that they cannot be interconverted. This message
991indicates that such a conversion was attempted.
a0d0e21e
LW
992
993=item Can't upgrade to undef
994
be771a83
GS
995(P) The undefined SV is the bottom of the totem pole, in the scheme of
996upgradability. Upgrading to undef indicates an error in the code
997calling sv_upgrade.
a0d0e21e 998
6df41af2
GS
999=item Can't use an undefined value as %s reference
1000
1001(F) A value used as either a hard reference or a symbolic reference must
1002be a defined value. This helps to delurk some insidious errors.
1003
1db89ea5
BS
1004=item Can't use anonymous symbol table for method lookup
1005
1006(P) The internal routine that does method lookup was handed a symbol
1007table that doesn't have a name. Symbol tables can become anonymous
1008for example by undefining stashes: C<undef %Some::Package::>.
1009
6df41af2
GS
1010=item Can't use bareword ("%s") as %s ref while "strict refs" in use
1011
be771a83
GS
1012(F) Only hard references are allowed by "strict refs". Symbolic
1013references are disallowed. See L<perlref>.
6df41af2 1014
90b75b61 1015=item Can't use %! because Errno.pm is not available
1d2dff63
GS
1016
1017(F) The first time the %! hash is used, perl automatically loads the
1018Errno.pm module. The Errno module is expected to tie the %! hash to
1019provide symbolic names for C<$!> errno values.
1020
6df41af2
GS
1021=item Can't use %s for loop variable
1022
be771a83
GS
1023(F) Only a simple scalar variable may be used as a loop variable on a
1024foreach.
6df41af2
GS
1025
1026=item Can't use global %s in "my"
1027
be771a83
GS
1028(F) You tried to declare a magical variable as a lexical variable. This
1029is not allowed, because the magic can be tied to only one location
1030(namely the global variable) and it would be incredibly confusing to
1031have variables in your program that looked like magical variables but
6df41af2
GS
1032weren't.
1033
c07a80fd
PP
1034=item Can't use "my %s" in sort comparison
1035
1036(F) The global variables $a and $b are reserved for sort comparisons.
c47ff5f1 1037You mentioned $a or $b in the same line as the <=> or cmp operator,
c07a80fd
PP
1038and the variable had earlier been declared as a lexical variable.
1039Either qualify the sort variable with the package name, or rename the
1040lexical variable.
1041
a0d0e21e
LW
1042=item Can't use %s ref as %s ref
1043
1044(F) You've mixed up your reference types. You have to dereference a
1045reference of the type needed. You can use the ref() function to
1046test the type of the reference, if need be.
1047
748a9306 1048=item Can't use string ("%s") as %s ref while "strict refs" in use
a0d0e21e 1049
be771a83
GS
1050(F) Only hard references are allowed by "strict refs". Symbolic
1051references are disallowed. See L<perlref>.
a0d0e21e 1052
748a9306
LW
1053=item Can't use subscript on %s
1054
1055(F) The compiler tried to interpret a bracketed expression as a
1056subscript. But to the left of the brackets was an expression that
1057didn't look like an array reference, or anything else subscriptable.
1058
6df41af2
GS
1059=item Can't use \%c to mean $%c in expression
1060
75b44862
GS
1061(W syntax) In an ordinary expression, backslash is a unary operator that
1062creates a reference to its argument. The use of backslash to indicate a
1063backreference to a matched substring is valid only as part of a regular
be771a83
GS
1064expression pattern. Trying to do this in ordinary Perl code produces a
1065value that prints out looking like SCALAR(0xdecaf). Use the $1 form
1066instead.
6df41af2 1067
810b8aa5
GS
1068=item Can't weaken a nonreference
1069
1070(F) You attempted to weaken something that was not a reference. Only
1071references can be weakened.
1072
5f05dabc 1073=item Can't x= to read-only value
a0d0e21e 1074
be771a83
GS
1075(F) You tried to repeat a constant value (often the undefined value)
1076with an assignment operator, which implies modifying the value itself.
a0d0e21e
LW
1077Perhaps you need to copy the value to a temporary, and repeat that.
1078
ac7cd81a
SC
1079=item Character in "C" format wrapped
1080
1081(W pack) You said
1082
1083 pack("C", $x)
1084
1085where $x is either less than 0 or more than 255; the C<"C"> format is
1086only for encoding native operating system characters (ASCII, EBCDIC,
1087and so on) and not for Unicode characters, so Perl behaved as if you meant
1088
1089 pack("C", $x & 255)
1090
1091If you actually want to pack Unicode codepoints, use the C<"U"> format
1092instead.
1093
1094=item Character in "c" format wrapped
1095
1096(W pack) You said
1097
1098 pack("c", $x)
1099
1100where $x is either less than -128 or more than 127; the C<"c"> format
1101is only for encoding native operating system characters (ASCII, EBCDIC,
1102and so on) and not for Unicode characters, so Perl behaved as if you meant
1103
1104 pack("c", $x & 255);
1105
1106If you actually want to pack Unicode codepoints, use the C<"U"> format
1107instead.
1108
9ddeeac9 1109=item close() on unopened filehandle %s
a0d0e21e 1110
e476b1b5 1111(W unopened) You tried to close a filehandle that was never opened.
a0d0e21e 1112
6df41af2
GS
1113=item %s: Command not found
1114
be771a83
GS
1115(A) You've accidentally run your script through B<csh> instead of Perl.
1116Check the #! line, or manually feed your script into Perl yourself.
6df41af2 1117
7a2e2cd6
PP
1118=item Compilation failed in require
1119
1120(F) Perl could not compile a file specified in a C<require> statement.
be771a83
GS
1121Perl uses this generic message when none of the errors that it
1122encountered were severe enough to halt compilation immediately.
7a2e2cd6 1123
c3464db5
DD
1124=item Complex regular subexpression recursion limit (%d) exceeded
1125
be771a83
GS
1126(W regexp) The regular expression engine uses recursion in complex
1127situations where back-tracking is required. Recursion depth is limited
1128to 32766, or perhaps less in architectures where the stack cannot grow
1129arbitrarily. ("Simple" and "medium" situations are handled without
1130recursion and are not subject to a limit.) Try shortening the string
1131under examination; looping in Perl code (e.g. with C<while>) rather than
1132in the regular expression engine; or rewriting the regular expression so
c2e66d9e 1133that it is simpler or backtracks less. (See L<perlfaq2> for information
be771a83 1134on I<Mastering Regular Expressions>.)
c3464db5 1135
69282e91 1136=item connect() on closed socket %s
a0d0e21e 1137
be771a83
GS
1138(W closed) You tried to do a connect on a closed socket. Did you forget
1139to check the return value of your socket() call? See
1140L<perlfunc/connect>.
a0d0e21e 1141
41ab332f 1142=item Constant(%s)%s: %s
6df41af2 1143
be771a83
GS
1144(F) The parser found inconsistencies either while attempting to define
1145an overloaded constant, or when trying to find the character name
1146specified in the C<\N{...}> escape. Perhaps you forgot to load the
1147corresponding C<overload> or C<charnames> pragma? See L<charnames> and
1148L<overload>.
6df41af2 1149
779c5bc9
GS
1150=item Constant is not %s reference
1151
1152(F) A constant value (perhaps declared using the C<use constant> pragma)
be771a83
GS
1153is being dereferenced, but it amounts to the wrong type of reference.
1154The message indicates the type of reference that was expected. This
1155usually indicates a syntax error in dereferencing the constant value.
779c5bc9
GS
1156See L<perlsub/"Constant Functions"> and L<constant>.
1157
4cee8e80
CS
1158=item Constant subroutine %s redefined
1159
be771a83
GS
1160(S|W redefine) You redefined a subroutine which had previously been
1161eligible for inlining. See L<perlsub/"Constant Functions"> for
1162commentary and workarounds.
4cee8e80 1163
9607fc9c
PP
1164=item Constant subroutine %s undefined
1165
be771a83
GS
1166(W misc) You undefined a subroutine which had previously been eligible
1167for inlining. See L<perlsub/"Constant Functions"> for commentary and
1168workarounds.
9607fc9c 1169
e7ea3e70
IZ
1170=item Copy method did not return a reference
1171
64977eb6 1172(F) The method which overloads "=" is buggy. See
13a2d996 1173L<overload/Copy Constructor>.
e7ea3e70 1174
6798c92b
GS
1175=item CORE::%s is not a keyword
1176
1177(F) The CORE:: namespace is reserved for Perl keywords.
1178
a0d0e21e
LW
1179=item corrupted regexp pointers
1180
1181(P) The regular expression engine got confused by what the regular
1182expression compiler gave it.
1183
1184=item corrupted regexp program
1185
be771a83
GS
1186(P) The regular expression engine got passed a regexp program without a
1187valid magic number.
a0d0e21e 1188
6df41af2
GS
1189=item Corrupt malloc ptr 0x%lx at 0x%lx
1190
1191(P) The malloc package that comes with Perl had an internal failure.
1192
1193=item C<-p> destination: %s
1194
1195(F) An error occurred during the implicit output invoked by the C<-p>
1196command-line switch. (This output goes to STDOUT unless you've
1197redirected it with select().)
1198
1199=item C<-T> and C<-B> not implemented on filehandles
1200
1201(F) Perl can't peek at the stdio buffer of filehandles when it doesn't
1202know about your kind of stdio. You'll have to use a filename instead.
1203
a0d0e21e
LW
1204=item Deep recursion on subroutine "%s"
1205
be771a83
GS
1206(W recursion) This subroutine has called itself (directly or indirectly)
1207100 times more than it has returned. This probably indicates an
1208infinite recursion, unless you're writing strange benchmark programs, in
1209which case it indicates something else.
a0d0e21e 1210
f10b0346 1211=item defined(@array) is deprecated
69794302 1212
be771a83
GS
1213(D deprecated) defined() is not usually useful on arrays because it
1214checks for an undefined I<scalar> value. If you want to see if the
64977eb6 1215array is empty, just use C<if (@array) { # not empty }> for example.
69794302 1216
f10b0346 1217=item defined(%hash) is deprecated
69794302 1218
be771a83
GS
1219(D deprecated) defined() is not usually useful on hashes because it
1220checks for an undefined I<scalar> value. If you want to see if the hash
64977eb6 1221is empty, just use C<if (%hash) { # not empty }> for example.
69794302 1222
fc36a67e
PP
1223=item Delimiter for here document is too long
1224
be771a83
GS
1225(F) In a here document construct like C<<<FOO>, the label C<FOO> is too
1226long for Perl to handle. You have to be seriously twisted to write code
1227that triggers this error.
fc36a67e 1228
3cdd684c
TP
1229=item Did not produce a valid header
1230
1231See Server error.
1232
6df41af2
GS
1233=item %s did not return a true value
1234
1235(F) A required (or used) file must return a true value to indicate that
1236it compiled correctly and ran its initialization code correctly. It's
1237traditional to end such a file with a "1;", though any true value would
1238do. See L<perlfunc/require>.
1239
cc507455 1240=item (Did you mean &%s instead?)
4633a7c4 1241
be771a83
GS
1242(W) You probably referred to an imported subroutine &FOO as $FOO or some
1243such.
4633a7c4 1244
cc507455 1245=item (Did you mean "local" instead of "our"?)
33633739 1246
be771a83
GS
1247(W misc) Remember that "our" does not localize the declared global
1248variable. You have declared it again in the same lexical scope, which
1249seems superfluous.
33633739 1250
cc507455 1251=item (Did you mean $ or @ instead of %?)
a0d0e21e 1252
be771a83
GS
1253(W) You probably said %hash{$key} when you meant $hash{$key} or
1254@hash{@keys}. On the other hand, maybe you just meant %hash and got
1255carried away.
748a9306 1256
7e1af8bc 1257=item Died
5f05dabc
PP
1258
1259(F) You passed die() an empty string (the equivalent of C<die "">) or
1260you called it with no args and both C<$@> and C<$_> were empty.
1261
3cdd684c
TP
1262=item Document contains no data
1263
1264See Server error.
1265
a0d0e21e
LW
1266=item Don't know how to handle magic of type '%s'
1267
1268(P) The internal handling of magical variables has been cursed.
1269
1270=item do_study: out of memory
1271
1272(P) This should have been caught by safemalloc() instead.
1273
6df41af2
GS
1274=item (Do you need to predeclare %s?)
1275
1276(S) This is an educated guess made in conjunction with the message "%s
1277found where operator expected". It often means a subroutine or module
1278name is being referenced that hasn't been declared yet. This may be
1279because of ordering problems in your file, or because of a missing
be771a83
GS
1280"sub", "package", "require", or "use" statement. If you're referencing
1281something that isn't defined yet, you don't actually have to define the
1282subroutine or package before the current location. You can use an empty
1283"sub foo;" or "package FOO;" to enter a "forward" declaration.
6df41af2 1284
a0d0e21e
LW
1285=item Duplicate free() ignored
1286
be771a83
GS
1287(S malloc) An internal routine called free() on something that had
1288already been freed.
a0d0e21e 1289
4633a7c4
LW
1290=item elseif should be elsif
1291
be771a83
GS
1292(S) There is no keyword "elseif" in Perl because Larry thinks it's ugly.
1293Your code will be interpreted as an attempt to call a method named
1294"elseif" for the class returned by the following block. This is
4633a7c4
LW
1295unlikely to be what you want.
1296
85ab1d1d 1297=item entering effective %s failed
5ff3f7a4 1298
85ab1d1d 1299(F) While under the C<use filetest> pragma, switching the real and
5ff3f7a4
GS
1300effective uids or gids failed.
1301
748a9306
LW
1302=item Error converting file specification %s
1303
5f05dabc 1304(F) An error peculiar to VMS. Because Perl may have to deal with file
748a9306 1305specifications in either VMS or Unix syntax, it converts them to a
be771a83
GS
1306single form when it must operate on them directly. Either you've passed
1307an invalid file specification to Perl, or you've found a case the
1308conversion routines don't handle. Drat.
748a9306 1309
e4d48cc9
GS
1310=item %s: Eval-group in insecure regular expression
1311
be771a83
GS
1312(F) Perl detected tainted data when trying to compile a regular
1313expression that contains the C<(?{ ... })> zero-width assertion, which
1314is unsafe. See L<perlre/(?{ code })>, and L<perlsec>.
e4d48cc9 1315
e4d48cc9
GS
1316=item %s: Eval-group not allowed at run time
1317
be771a83
GS
1318(F) Perl tried to compile a regular expression containing the
1319C<(?{ ... })> zero-width assertion at run time, as it would when the
1320pattern contains interpolated values. Since that is a security risk, it
1321is not allowed. If you insist, you may still do this by explicitly
1322building the pattern from an interpolated string at run time and using
1323that in an eval(). See L<perlre/(?{ code })>.
e4d48cc9 1324
6df41af2
GS
1325=item %s: Eval-group not allowed, use re 'eval'
1326
be771a83
GS
1327(F) A regular expression contained the C<(?{ ... })> zero-width
1328assertion, but that construct is only allowed when the C<use re 'eval'>
1329pragma is in effect. See L<perlre/(?{ code })>.
6df41af2 1330
fc36a67e
PP
1331=item Excessively long <> operator
1332
1333(F) The contents of a <> operator may not exceed the maximum size of a
1334Perl identifier. If you're just trying to glob a long list of
1335filenames, try using the glob() operator, or put the filenames into a
1336variable and glob that.
1337
f86702cc 1338=item Execution of %s aborted due to compilation errors
a0d0e21e
LW
1339
1340(F) The final summary message when a Perl compilation fails.
1341
1342=item Exiting eval via %s
1343
be771a83
GS
1344(W exiting) You are exiting an eval by unconventional means, such as a
1345goto, or a loop control statement.
e476b1b5
GS
1346
1347=item Exiting format via %s
1348
be771a83
GS
1349(W exiting) You are exiting an eval by unconventional means, such as a
1350goto, or a loop control statement.
a0d0e21e 1351
0a753a76
PP
1352=item Exiting pseudo-block via %s
1353
be771a83
GS
1354(W exiting) You are exiting a rather special block construct (like a
1355sort block or subroutine) by unconventional means, such as a goto, or a
1356loop control statement. See L<perlfunc/sort>.
0a753a76 1357
a0d0e21e
LW
1358=item Exiting subroutine via %s
1359
be771a83
GS
1360(W exiting) You are exiting a subroutine by unconventional means, such
1361as a goto, or a loop control statement.
a0d0e21e
LW
1362
1363=item Exiting substitution via %s
1364
be771a83
GS
1365(W exiting) You are exiting a substitution by unconventional means, such
1366as a return, a goto, or a loop control statement.
a0d0e21e 1367
7b8d334a
GS
1368=item Explicit blessing to '' (assuming package main)
1369
be771a83
GS
1370(W misc) You are blessing a reference to a zero length string. This has
1371the effect of blessing the reference into the package main. This is
1372usually not what you want. Consider providing a default target package,
1373e.g. bless($ref, $p || 'MyPackage');
7b8d334a 1374
6df41af2
GS
1375=item %s: Expression syntax
1376
be771a83
GS
1377(A) You've accidentally run your script through B<csh> instead of Perl.
1378Check the #! line, or manually feed your script into Perl yourself.
6df41af2
GS
1379
1380=item %s failed--call queue aborted
1381
1382(F) An untrapped exception was raised while executing a CHECK, INIT, or
1383END subroutine. Processing of the remainder of the queue of such
1384routines has been prematurely ended.
1385
7253e4e3 1386=item False [] range "%s" in regex; marked by <-- HERE in m/%s/
73b437c8 1387
be771a83 1388(W regexp) A character class range must start and end at a literal
7253e4e3
RK
1389character, not another character class like C<\d> or C<[:alpha:]>. The "-"
1390in your false range is interpreted as a literal "-". Consider quoting the
1391"-", "\-". The <-- HERE shows in the regular expression about where the
1392problem was discovered. See L<perlre>.
73b437c8 1393
748a9306 1394=item Fatal VMS error at %s, line %d
a0d0e21e 1395
be771a83
GS
1396(P) An error peculiar to VMS. Something untoward happened in a VMS
1397system service or RTL routine; Perl's exit status should provide more
1398details. The filename in "at %s" and the line number in "line %d" tell
1399you which section of the Perl source code is distressed.
a0d0e21e
LW
1400
1401=item fcntl is not implemented
1402
1403(F) Your machine apparently doesn't implement fcntl(). What is this, a
1404PDP-11 or something?
1405
af8c498a 1406=item Filehandle %s opened only for input
a0d0e21e 1407
be771a83
GS
1408(W io) You tried to write on a read-only filehandle. If you intended it
1409to be a read-write filehandle, you needed to open it with "+<" or "+>"
1410or "+>>" instead of with "<" or nothing. If you intended only to write
1411the file, use ">" or ">>". See L<perlfunc/open>.
a0d0e21e 1412
af8c498a 1413=item Filehandle %s opened only for output
a0d0e21e 1414
be771a83
GS
1415(W io) You tried to read from a filehandle opened only for writing. If
1416you intended it to be a read/write filehandle, you needed to open it
1417with "+<" or "+>" or "+>>" instead of with "<" or nothing. If you
1418intended only to read from the file, use "<". See L<perlfunc/open>.
a0d0e21e
LW
1419
1420=item Final $ should be \$ or $name
1421
1422(F) You must now decide whether the final $ in a string was meant to be
be771a83
GS
1423a literal dollar sign, or was meant to introduce a variable name that
1424happens to be missing. So you have to put either the backslash or the
1425name.
a0d0e21e
LW
1426
1427=item Final @ should be \@ or @name
1428
1429(F) You must now decide whether the final @ in a string was meant to be
be771a83
GS
1430a literal "at" sign, or was meant to introduce a variable name that
1431happens to be missing. So you have to put either the backslash or the
1432name.
a0d0e21e 1433
56e90b21
GS
1434=item flock() on closed filehandle %s
1435
be771a83 1436(W closed) The filehandle you're attempting to flock() got itself closed
c289d2f7 1437some time before now. Check your control flow. flock() operates on
be771a83
GS
1438filehandles. Are you attempting to call flock() on a dirhandle by the
1439same name?
56e90b21 1440
5cd5c422
RB
1441=item Quantifier follows nothing in regex;
1442
1443marked by <-- HERE in m/%s/
6df41af2 1444
b45f050a 1445(F) You started a regular expression with a quantifier. Backslash it if you
7253e4e3
RK
1446meant it literally. The <-- HERE shows in the regular expression about
1447where the problem was discovered. See L<perlre>.
6df41af2
GS
1448
1449=item Format not terminated
1450
1451(F) A format must be terminated by a line with a solitary dot. Perl got
1452to the end of your file without finding such a line.
1453
a0d0e21e
LW
1454=item Format %s redefined
1455
e476b1b5 1456(W redefine) You redefined a format. To suppress this warning, say
a0d0e21e
LW
1457
1458 {
4438c4b7 1459 no warnings;
a0d0e21e
LW
1460 eval "format NAME =...";
1461 }
1462
a0d0e21e
LW
1463=item Found = in conditional, should be ==
1464
e476b1b5 1465(W syntax) You said
a0d0e21e
LW
1466
1467 if ($foo = 123)
1468
1469when you meant
1470
1471 if ($foo == 123)
1472
1473(or something like that).
1474
6df41af2
GS
1475=item %s found where operator expected
1476
1477(S) The Perl lexer knows whether to expect a term or an operator. If it
be771a83
GS
1478sees what it knows to be a term when it was expecting to see an
1479operator, it gives you this warning. Usually it indicates that an
1480operator or delimiter was omitted, such as a semicolon.
6df41af2 1481
a0d0e21e
LW
1482=item gdbm store returned %d, errno %d, key "%s"
1483
1484(S) A warning from the GDBM_File extension that a store failed.
1485
1486=item gethostent not implemented
1487
1488(F) Your C library apparently doesn't implement gethostent(), probably
1489because if it did, it'd feel morally obligated to return every hostname
1490on the Internet.
1491
69282e91 1492=item get%sname() on closed socket %s
a0d0e21e 1493
be771a83
GS
1494(W closed) You tried to get a socket or peer socket name on a closed
1495socket. Did you forget to check the return value of your socket() call?
a0d0e21e 1496
748a9306
LW
1497=item getpwnam returned invalid UIC %#o for user "%s"
1498
1499(S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
1500C<getpwnam> operator returned an invalid UIC.
1501
6df41af2
GS
1502=item getsockopt() on closed socket %s
1503
be771a83
GS
1504(W closed) You tried to get a socket option on a closed socket. Did you
1505forget to check the return value of your socket() call? See
6df41af2
GS
1506L<perlfunc/getsockopt>.
1507
1508=item Global symbol "%s" requires explicit package name
1509
1510(F) You've said "use strict vars", which indicates that all variables
1511must either be lexically scoped (using "my"), declared beforehand using
1512"our", or explicitly qualified to say which package the global variable
1513is in (using "::").
1514
e476b1b5
GS
1515=item glob failed (%s)
1516
be771a83
GS
1517(W glob) Something went wrong with the external program(s) used for
1518C<glob> and C<< <*.c> >>. Usually, this means that you supplied a
1519C<glob> pattern that caused the external program to fail and exit with a
1520nonzero status. If the message indicates that the abnormal exit
1521resulted in a coredump, this may also mean that your csh (C shell) is
1522broken. If so, you should change all of the csh-related variables in
1523config.sh: If you have tcsh, make the variables refer to it as if it
1524were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all
1525empty (except that C<d_csh> should be C<'undef'>) so that Perl will
1526think csh is missing. In either case, after editing config.sh, run
75b44862 1527C<./Configure -S> and rebuild Perl.
e476b1b5 1528
a0d0e21e
LW
1529=item Glob not terminated
1530
1531(F) The lexer saw a left angle bracket in a place where it was expecting
be771a83
GS
1532a term, so it's looking for the corresponding right angle bracket, and
1533not finding it. Chances are you left some needed parentheses out
1534earlier in the line, and you really meant a "less than".
a0d0e21e 1535
6df41af2 1536=item Got an error from DosAllocMem
a0d0e21e 1537
6df41af2
GS
1538(P) An error peculiar to OS/2. Most probably you're using an obsolete
1539version of Perl, and this should not happen anyway.
a0d0e21e
LW
1540
1541=item goto must have label
1542
1543(F) Unlike with "next" or "last", you're not allowed to goto an
1544unspecified destination. See L<perlfunc/goto>.
1545
6df41af2
GS
1546=item %s had compilation errors
1547
1548(F) The final summary message when a C<perl -c> fails.
1549
a0d0e21e
LW
1550=item Had to create %s unexpectedly
1551
be771a83
GS
1552(S internal) A routine asked for a symbol from a symbol table that ought
1553to have existed already, but for some reason it didn't, and had to be
1554created on an emergency basis to prevent a core dump.
a0d0e21e
LW
1555
1556=item Hash %%s missing the % in argument %d of %s()
1557
be771a83
GS
1558(D deprecated) Really old Perl let you omit the % on hash names in some
1559spots. This is now heavily deprecated.
a0d0e21e 1560
6df41af2
GS
1561=item %s has too many errors
1562
1563(F) The parser has given up trying to parse the program after 10 errors.
1564Further error messages would likely be uninformative.
1565
252aa082
JH
1566=item Hexadecimal number > 0xffffffff non-portable
1567
e476b1b5 1568(W portable) The hexadecimal number you specified is larger than 2**32-1
9e24b6e2
JH
1569(4294967295) and therefore non-portable between systems. See
1570L<perlport> for more on portability concerns.
252aa082 1571
8903cb82
PP
1572=item Identifier too long
1573
1574(F) Perl limits identifiers (names for variables, functions, etc.) to
fc36a67e 1575about 250 characters for simple names, and somewhat more for compound
be771a83
GS
1576names (like C<$A::B>). You've exceeded Perl's limits. Future versions
1577of Perl are likely to eliminate these arbitrary limitations.
8903cb82 1578
6df41af2 1579=item Illegal binary digit %s
f675dbe5 1580
6df41af2 1581(F) You used a digit other than 0 or 1 in a binary number.
f675dbe5 1582
6df41af2 1583=item Illegal binary digit %s ignored
a0d0e21e 1584
be771a83
GS
1585(W digit) You may have tried to use a digit other than 0 or 1 in a
1586binary number. Interpretation of the binary number stopped before the
1587offending digit.
a0d0e21e 1588
4fdae800
PP
1589=item Illegal character %s (carriage return)
1590
d5898338 1591(F) Perl normally treats carriage returns in the program text as it
be771a83
GS
1592would any other whitespace, which means you should never see this error
1593when Perl was built using standard options. For some reason, your
1594version of Perl appears to have been built without this support. Talk
1595to your Perl administrator.
4fdae800 1596
a0d0e21e
LW
1597=item Illegal division by zero
1598
be771a83
GS
1599(F) You tried to divide a number by 0. Either something was wrong in
1600your logic, or you need to put a conditional in to guard against
1601meaningless input.
a0d0e21e 1602
6df41af2
GS
1603=item Illegal hexadecimal digit %s ignored
1604
be771a83
GS
1605(W digit) You may have tried to use a character other than 0 - 9 or
1606A - F, a - f in a hexadecimal number. Interpretation of the hexadecimal
1607number stopped before the illegal character.
6df41af2 1608
a0d0e21e
LW
1609=item Illegal modulus zero
1610
be771a83
GS
1611(F) You tried to divide a number by 0 to get the remainder. Most
1612numbers don't take to this kindly.
a0d0e21e 1613
6df41af2 1614=item Illegal number of bits in vec
399388f4 1615
6df41af2
GS
1616(F) The number of bits in vec() (the third argument) must be a power of
1617two from 1 to 32 (or 64, if your platform supports that).
399388f4
GS
1618
1619=item Illegal octal digit %s
a0d0e21e
LW
1620
1621(F) You used an 8 or 9 in a octal number.
1622
399388f4 1623=item Illegal octal digit %s ignored
748a9306 1624
75b44862
GS
1625(W digit) You may have tried to use an 8 or 9 in a octal number.
1626Interpretation of the octal number stopped before the 8 or 9.
748a9306 1627
6df41af2 1628=item Illegal switch in PERL5OPT: %s
6ff81951 1629
6df41af2
GS
1630(X) The PERL5OPT environment variable may only be used to set the
1631following switches: B<-[DIMUdmw]>.
6ff81951 1632
6df41af2 1633=item Ill-formed CRTL environ value "%s"
81e118e0 1634
75b44862 1635(W internal) A warning peculiar to VMS. Perl tried to read the CRTL's
be771a83
GS
1636internal environ array, and encountered an element without the C<=>
1637delimiter used to separate keys from values. The element is ignored.
09bef843 1638
6df41af2 1639=item Ill-formed message in prime_env_iter: |%s|
54310121 1640
be771a83
GS
1641(W internal) A warning peculiar to VMS. Perl tried to read a logical
1642name or CLI symbol definition when preparing to iterate over %ENV, and
1643didn't see the expected delimiter between key and value, so the line was
1644ignored.
54310121 1645
6df41af2 1646=item (in cleanup) %s
9607fc9c 1647
be771a83
GS
1648(W misc) This prefix usually indicates that a DESTROY() method raised
1649the indicated exception. Since destructors are usually called by the
1650system at arbitrary points during execution, and often a vast number of
1651times, the warning is issued only once for any number of failures that
1652would otherwise result in the same message being repeated.
6df41af2 1653
be771a83
GS
1654Failure of user callbacks dispatched using the C<G_KEEPERR> flag could
1655also result in this warning. See L<perlcall/G_KEEPERR>.
9607fc9c 1656
a0d0e21e
LW
1657=item Insecure dependency in %s
1658
8b1a09fc 1659(F) You tried to do something that the tainting mechanism didn't like.
be771a83
GS
1660The tainting mechanism is turned on when you're running setuid or
1661setgid, or when you specify B<-T> to turn it on explicitly. The
1662tainting mechanism labels all data that's derived directly or indirectly
1663from the user, who is considered to be unworthy of your trust. If any
1664such data is used in a "dangerous" operation, you get this error. See
1665L<perlsec> for more information.
a0d0e21e
LW
1666
1667=item Insecure directory in %s
1668
be771a83
GS
1669(F) You can't use system(), exec(), or a piped open in a setuid or
1670setgid script if C<$ENV{PATH}> contains a directory that is writable by
1671the world. See L<perlsec>.
a0d0e21e 1672
62f468fc 1673=item Insecure $ENV{%s} while running %s
a0d0e21e
LW
1674
1675(F) You can't use system(), exec(), or a piped open in a setuid or
62f468fc
G
1676setgid script if any of C<$ENV{PATH}>, C<$ENV{IFS}>, C<$ENV{CDPATH}>,
1677C<$ENV{ENV}> or C<$ENV{BASH_ENV}> are derived from data supplied (or
a0d0e21e
LW
1678potentially supplied) by the user. The script must set the path to a
1679known value, using trustworthy data. See L<perlsec>.
1680
a7ae9550
GS
1681=item Integer overflow in %s number
1682
75b44862 1683(W overflow) The hexadecimal, octal or binary number you have specified
be771a83
GS
1684either as a literal or as an argument to hex() or oct() is too big for
1685your architecture, and has been converted to a floating point number.
1686On a 32-bit architecture the largest hexadecimal, octal or binary number
9e24b6e2
JH
1687representable without overflow is 0xFFFFFFFF, 037777777777, or
16880b11111111111111111111111111111111 respectively. Note that Perl
1689transparently promotes all numbers to a floating point representation
1690internally--subject to loss of precision errors in subsequent
1691operations.
bbce6d69 1692
7253e4e3 1693=item Internal disaster in regex; marked by <-- HERE in m/%s/
6df41af2
GS
1694
1695(P) Something went badly wrong in the regular expression parser.
7253e4e3 1696The <-- HERE shows in the regular expression about where the problem was
b45f050a
JF
1697discovered.
1698
748a9306
LW
1699=item Internal inconsistency in tracking vforks
1700
be771a83
GS
1701(S) A warning peculiar to VMS. Perl keeps track of the number of times
1702you've called C<fork> and C<exec>, to determine whether the current call
1703to C<exec> should affect the current script or a subprocess (see
1704L<perlvms/"exec LIST">). Somehow, this count has become scrambled, so
1705Perl is making a guess and treating this C<exec> as a request to
1706terminate the Perl script and execute the specified command.
748a9306 1707
7253e4e3 1708=item Internal urp in regex; marked by <-- HERE in m/%s/
b45f050a 1709
7253e4e3
RK
1710(P) Something went badly awry in the regular expression parser. The
1711<-- HERE shows in the regular expression about where the problem was
1712discovered.
a0d0e21e 1713
6df41af2
GS
1714=item %s (...) interpreted as function
1715
75b44862 1716(W syntax) You've run afoul of the rule that says that any list operator
be771a83 1717followed by parentheses turns into a function, with all the list
64977eb6 1718operators arguments found inside the parentheses. See
13a2d996 1719L<perlop/Terms and List Operators (Leftward)>.
6df41af2 1720
09bef843
SB
1721=item Invalid %s attribute: %s
1722
1723The indicated attribute for a subroutine or variable was not recognized
1724by Perl or by a user-supplied handler. See L<attributes>.
1725
1726=item Invalid %s attributes: %s
1727
be771a83
GS
1728The indicated attributes for a subroutine or variable were not
1729recognized by Perl or by a user-supplied handler. See L<attributes>.
09bef843 1730
c635e13b
PP
1731=item Invalid conversion in %s: "%s"
1732
be771a83
GS
1733(W printf) Perl does not understand the given format conversion. See
1734L<perlfunc/sprintf>.
c635e13b 1735
7253e4e3 1736=item Invalid [] range "%s" in regex; marked by <-- HERE in m/%s/
6df41af2
GS
1737
1738(F) The range specified in a character class had a minimum character
7253e4e3
RK
1739greater than the maximum character. One possibility is that you forgot the
1740C<{}> from your ending C<\x{}> - C<\x> without the curly braces can go only
1741up to C<ff>. The <-- HERE shows in the regular expression about where the
1742problem was discovered. See L<perlre>.
6df41af2 1743
7253e4e3 1744=item Invalid [] range "%s" in transliteration operator
c2e66d9e
GS
1745
1746(F) The range specified in the tr/// or y/// operator had a minimum
1747character greater than the maximum character. See L<perlop>.
1748
09bef843
SB
1749=item Invalid separator character %s in attribute list
1750
0120eecf 1751(F) Something other than a colon or whitespace was seen between the
be771a83
GS
1752elements of an attribute list. If the previous attribute had a
1753parenthesised parameter list, perhaps that list was terminated too soon.
1754See L<attributes>.
09bef843 1755
96e4d5b1
PP
1756=item Invalid type in pack: '%s'
1757
8903cb82 1758(F) The given character is not a valid pack type. See L<perlfunc/pack>.
be771a83
GS
1759(W pack) The given character is not a valid pack type but used to be
1760silently ignored.
96e4d5b1
PP
1761
1762=item Invalid type in unpack: '%s'
1763
be771a83
GS
1764(F) The given character is not a valid unpack type. See
1765L<perlfunc/unpack>.
75b44862
GS
1766(W unpack) The given character is not a valid unpack type but used to be
1767silently ignored.
96e4d5b1 1768
a0d0e21e
LW
1769=item ioctl is not implemented
1770
1771(F) Your machine apparently doesn't implement ioctl(), which is pretty
1772strange for a machine that supports C.
1773
c289d2f7
JH
1774=item ioctl() on unopened %s
1775
1776(W unopened) You tried ioctl() on a filehandle that was never opened.
1777Check you control flow and number of arguments.
1778
80cbd5ad
JH
1779=item IO::Socket::atmark not implemented on this architecture
1780
1781(F) Your machine doesn't implement the sockatmark() functionality,
1782neither as a system call or an ioctl call (SIOCATMARK).
1783
6ad11d81
JH
1784=item `%s' is not a code reference
1785
1786(W) The second (fourth, sixth, ...) argument of overload::constant needs
1787to be a code reference. Either an anonymous subroutine, or a reference
1788to a subroutine.
1789
1790=item `%s' is not an overloadable type
1791
1792(W) You tried to overload a constant type the overload package is unaware of.
1793
a0d0e21e
LW
1794=item junk on end of regexp
1795
1796(P) The regular expression parser is confused.
1797
1798=item Label not found for "last %s"
1799
be771a83
GS
1800(F) You named a loop to break out of, but you're not currently in a loop
1801of that name, not even if you count where you were called from. See
1802L<perlfunc/last>.
a0d0e21e
LW
1803
1804=item Label not found for "next %s"
1805
1806(F) You named a loop to continue, but you're not currently in a loop of
1807that name, not even if you count where you were called from. See
1808L<perlfunc/last>.
1809
1810=item Label not found for "redo %s"
1811
1812(F) You named a loop to restart, but you're not currently in a loop of
1813that name, not even if you count where you were called from. See
1814L<perlfunc/last>.
1815
85ab1d1d 1816=item leaving effective %s failed
5ff3f7a4 1817
85ab1d1d 1818(F) While under the C<use filetest> pragma, switching the real and
5ff3f7a4
GS
1819effective uids or gids failed.
1820
69282e91 1821=item listen() on closed socket %s
a0d0e21e 1822
be771a83
GS
1823(W closed) You tried to do a listen on a closed socket. Did you forget
1824to check the return value of your socket() call? See
1825L<perlfunc/listen>.
a0d0e21e 1826
9d837945
TM
1827=item lstat() on filehandle %s
1828
1829(W io) You tried to do a lstat on a filehandle. What did you mean
1830by that? lstat() makes sense only on filenames. (Perl did a fstat()
1831instead on the filehandle.)
1832
cd06dffe
GS
1833=item Lvalue subs returning %s not implemented yet
1834
1835(F) Due to limitations in the current implementation, array and hash
be771a83
GS
1836values cannot be returned in subroutines used in lvalue context. See
1837L<perlsub/"Lvalue subroutines">.
cd06dffe 1838
5cd5c422
RB
1839=item Lookbehind longer than %d not implemented in regex;
1840
1841marked by <-- HERE in m/%s/
b45f050a
JF
1842
1843(F) There is currently a limit on the length of string which lookbehind can
7253e4e3
RK
1844handle. This restriction may be eased in a future release. The <-- HERE
1845shows in the regular expression about where the problem was discovered.
2e50fd82 1846
6df41af2
GS
1847=item Malformed PERLLIB_PREFIX
1848
1849(F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
1850
1851 prefix1;prefix2
1852
1853or
6df41af2
GS
1854 prefix1 prefix2
1855
be771a83
GS
1856with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
1857a builtin library search path, prefix2 is substituted. The error may
1858appear if components are not found, or are too long. See
fecfaeb8 1859"PERLLIB_PREFIX" in L<perlos2>.
6df41af2 1860
ba210ebe
JH
1861=item Malformed UTF-8 character (%s)
1862
1863Perl detected something that didn't comply with UTF-8 encoding rules.
1864
dea0fc0b
JH
1865=item Malformed UTF-16 surrogate
1866
1867Perl thought it was reading UTF-16 encoded character data but while
1868doing it Perl met a malformed Unicode surrogate.
1869
5cd5c422
RB
1870=item %s matches null string many times in regex;
1871
1872marked by <-- HERE in m/%s/
6df41af2
GS
1873
1874(W regexp) The pattern you've specified would be an infinite loop if the
7253e4e3
RK
1875regular expression engine didn't specifically check for that. The <-- HERE
1876shows in the regular expression about where the problem was discovered.
1877See L<perlre>.
6df41af2 1878
25f58aea
PN
1879=item "%s" may clash with future reserved word
1880
1881(W) This warning may be due to running a perl5 script through a perl4
1882interpreter, especially if the word that is being warned about is
1883"use" or "my".
1884
6df41af2
GS
1885=item % may only be used in unpack
1886
1887(F) You can't pack a string by supplying a checksum, because the
be771a83
GS
1888checksumming process loses information, and you can't go the other way.
1889See L<perlfunc/unpack>.
6df41af2 1890
a0d0e21e
LW
1891=item Method for operation %s not found in package %s during blessing
1892
1893(F) An attempt was made to specify an entry in an overloading table that
e7ea3e70 1894doesn't resolve to a valid subroutine. See L<overload>.
a0d0e21e 1895
3cdd684c
TP
1896=item Method %s not permitted
1897
1898See Server error.
1899
a0d0e21e
LW
1900=item Might be a runaway multi-line %s string starting on line %d
1901
1902(S) An advisory indicating that the previous error may have been caused
1903by a missing delimiter on a string or pattern, because it eventually
1904ended earlier on the current line.
1905
1906=item Misplaced _ in number
1907
d4ced10d
JH
1908(W syntax) An underscore (underbar) in a numeric constant did not
1909separate two digits.
a0d0e21e 1910
4a2d328f 1911=item Missing %sbrace%s on \N{}
423cee85 1912
4a2d328f 1913(F) Wrong syntax of character name literal C<\N{charname}> within
423cee85
JH
1914double-quotish context.
1915
a0d0e21e
LW
1916=item Missing comma after first argument to %s function
1917
1918(F) While certain functions allow you to specify a filehandle or an
1919"indirect object" before the argument list, this ain't one of them.
1920
06eaf0bc
GS
1921=item Missing command in piped open
1922
be771a83
GS
1923(W pipe) You used the C<open(FH, "| command")> or
1924C<open(FH, "command |")> construction, but the command was missing or
1925blank.
06eaf0bc 1926
6df41af2
GS
1927=item Missing name in "my sub"
1928
be771a83
GS
1929(F) The reserved syntax for lexically scoped subroutines requires that
1930they have a name with which they can be found.
6df41af2
GS
1931
1932=item Missing $ on loop variable
1933
be771a83
GS
1934(F) Apparently you've been programming in B<csh> too much. Variables
1935are always mentioned with the $ in Perl, unlike in the shells, where it
1936can vary from one line to the next.
6df41af2 1937
cc507455 1938=item (Missing operator before %s?)
748a9306
LW
1939
1940(S) This is an educated guess made in conjunction with the message "%s
1941found where operator expected". Often the missing operator is a comma.
1942
d98d5fff 1943=item Missing right curly or square bracket
a0d0e21e 1944
be771a83
GS
1945(F) The lexer counted more opening curly or square brackets than closing
1946ones. As a general rule, you'll find it's missing near the place you
1947were last editing.
a0d0e21e 1948
6df41af2
GS
1949=item (Missing semicolon on previous line?)
1950
1951(S) This is an educated guess made in conjunction with the message "%s
1952found where operator expected". Don't automatically put a semicolon on
1953the previous line just because you saw this message.
1954
a0d0e21e
LW
1955=item Modification of a read-only value attempted
1956
1957(F) You tried, directly or indirectly, to change the value of a
5f05dabc 1958constant. You didn't, of course, try "2 = 1", because the compiler
a0d0e21e
LW
1959catches that. But an easy way to do the same thing is:
1960
1961 sub mod { $_[0] = 1 }
1962 mod(2);
1963
1964Another way is to assign to a substr() that's off the end of the string.
1965
c5674021
PDF
1966Yet another way is to assign to a C<foreach> loop I<VAR> when I<VAR>
1967is aliased to a constant in the look I<LIST>:
1968
1969 $x = 1;
1970 foreach my $n ($x, 2) {
1971 $n *= 2; # modifies the $x, but fails on attempt to modify the 2
64977eb6 1972 }
c5674021 1973
7a4340ed 1974=item Modification of non-creatable array value attempted, %s
a0d0e21e
LW
1975
1976(F) You tried to make an array value spring into existence, and the
1977subscript was probably negative, even counting from end of the array
1978backwards.
1979
7a4340ed 1980=item Modification of non-creatable hash value attempted, %s
a0d0e21e 1981
be771a83
GS
1982(P) You tried to make a hash value spring into existence, and it
1983couldn't be created for some peculiar reason.
a0d0e21e
LW
1984
1985=item Module name must be constant
1986
1987(F) Only a bare module name is allowed as the first argument to a "use".
1988
be98fb35 1989=item Module name required with -%c option
6df41af2 1990
be98fb35
GS
1991(F) The C<-M> or C<-m> options say that Perl should load some module, but
1992you omitted the name of the module. Consult L<perlrun> for full details
1993about C<-M> and C<-m>.
6df41af2 1994
a0d0e21e
LW
1995=item msg%s not implemented
1996
1997(F) You don't have System V message IPC on your system.
1998
1999=item Multidimensional syntax %s not supported
2000
75b44862
GS
2001(W syntax) Multidimensional arrays aren't written like C<$foo[1,2,3]>.
2002They're written like C<$foo[1][2][3]>, as in C.
8b1a09fc 2003
6df41af2 2004=item / must be followed by a*, A* or Z*
09bef843 2005
6df41af2 2006(F) You had a pack template indicating a counted-length string,
be771a83
GS
2007Currently the only things that can have their length counted are a*, A*
2008or Z*. See L<perlfunc/pack>.
6df41af2
GS
2009
2010=item / must be followed by a, A or Z
2011
be771a83
GS
2012(F) You had an unpack template indicating a counted-length string, which
2013must be followed by one of the letters a, A or Z to indicate what sort
2014of string is to be unpacked. See L<perlfunc/pack>.
6df41af2
GS
2015
2016=item / must follow a numeric type
2017
be771a83
GS
2018(F) You had an unpack template that contained a '#', but this did not
2019follow some numeric unpack specification. See L<perlfunc/pack>.
6df41af2
GS
2020
2021=item "my sub" not yet implemented
2022
be771a83
GS
2023(F) Lexically scoped subroutines are not yet implemented. Don't try
2024that yet.
6df41af2
GS
2025
2026=item "my" variable %s can't be in a package
2027
be771a83
GS
2028(F) Lexically scoped variables aren't in a package, so it doesn't make
2029sense to try to declare one with a package qualifier on the front. Use
2030local() if you want to localize a package variable.
09bef843 2031
8b1a09fc
PP
2032=item Name "%s::%s" used only once: possible typo
2033
e476b1b5 2034(W once) Typographical errors often show up as unique variable names.
be771a83
GS
2035If you had a good reason for having a unique name, then just mention it
2036again somehow to suppress the message. The C<our> declaration is
77ca0c92 2037provided for this purpose.
a0d0e21e
LW
2038
2039=item Negative length
2040
be771a83
GS
2041(F) You tried to do a read/write/send/recv operation with a buffer
2042length that is less than 0. This is difficult to imagine.
a0d0e21e 2043
7253e4e3 2044=item Nested quantifiers in regex; marked by <-- HERE in m/%s/
a0d0e21e 2045
b45f050a 2046(F) You can't quantify a quantifier without intervening parentheses. So
7253e4e3 2047things like ** or +* or ?* are illegal. The <-- HERE shows in the regular
b45f050a 2048expression about where the problem was discovered.
a0d0e21e 2049
7253e4e3 2050Note that the minimal matching quantifiers, C<*?>, C<+?>, and
be771a83 2051C<??> appear to be nested quantifiers, but aren't. See L<perlre>.
a0d0e21e 2052
6df41af2 2053=item %s never introduced
a0d0e21e 2054
be771a83
GS
2055(S internal) The symbol in question was declared but somehow went out of
2056scope before it could possibly have been used.
a0d0e21e
LW
2057
2058=item No %s allowed while running setuid
2059
be771a83
GS
2060(F) Certain operations are deemed to be too insecure for a setuid or
2061setgid script to even be allowed to attempt. Generally speaking there
2062will be another way to do what you want that is, if not secure, at least
2063securable. See L<perlsec>.
a0d0e21e
LW
2064
2065=item No B<-e> allowed in setuid scripts
2066
2067(F) A setuid script can't be specified by the user.
2068
2069=item No comma allowed after %s
2070
2071(F) A list operator that has a filehandle or "indirect object" is not
2072allowed to have a comma between that and the following arguments.
2073Otherwise it'd be just another one of the arguments.
2074
0a753a76
PP
2075One possible cause for this is that you expected to have imported a
2076constant to your name space with B<use> or B<import> while no such
2077importing took place, it may for example be that your operating system
2078does not support that particular constant. Hopefully you did use an
2079explicit import list for the constants you expect to see, please see
2080L<perlfunc/use> and L<perlfunc/import>. While an explicit import list
2081would probably have caught this error earlier it naturally does not
2082remedy the fact that your operating system still does not support that
2083constant. Maybe you have a typo in the constants of the symbol import
2084list of B<use> or B<import> or in the constant name at the line where
2085this error was triggered?
2086
748a9306
LW
2087=item No command into which to pipe on command line
2088
be771a83
GS
2089(F) An error peculiar to VMS. Perl handles its own command line
2090redirection, and found a '|' at the end of the command line, so it
2091doesn't know where you want to pipe the output from this command.
748a9306 2092
a0d0e21e
LW
2093=item No DB::DB routine defined
2094
be771a83
GS
2095(F) The currently executing code was compiled with the B<-d> switch, but
2096for some reason the perl5db.pl file (or some facsimile thereof) didn't
2097define a routine to be called at the beginning of each statement. Which
2098is odd, because the file should have been required automatically, and
2099should have blown up the require if it didn't parse right.
a0d0e21e
LW
2100
2101=item No dbm on this machine
2102
2103(P) This is counted as an internal error, because every machine should
5f05dabc 2104supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>.
a0d0e21e
LW
2105
2106=item No DBsub routine
2107
2108(F) The currently executing code was compiled with the B<-d> switch,
2109but for some reason the perl5db.pl file (or some facsimile thereof)
2110didn't define a DB::sub routine to be called at the beginning of each
2111ordinary subroutine call.
2112
c47ff5f1 2113=item No error file after 2> or 2>> on command line
748a9306 2114
be771a83
GS
2115(F) An error peculiar to VMS. Perl handles its own command line
2116redirection, and found a '2>' or a '2>>' on the command line, but can't
2117find the name of the file to which to write data destined for stderr.
748a9306 2118
c47ff5f1 2119=item No input file after < on command line
748a9306 2120
be771a83
GS
2121(F) An error peculiar to VMS. Perl handles its own command line
2122redirection, and found a '<' on the command line, but can't find the
2123name of the file from which to read data for stdin.
748a9306 2124
6df41af2
GS
2125=item No #! line
2126
2127(F) The setuid emulator requires that scripts have a well-formed #! line
2128even on machines that don't support the #! construct.
2129
2130=item "no" not allowed in expression
2131
be771a83
GS
2132(F) The "no" keyword is recognized and executed at compile time, and
2133returns no useful value. See L<perlmod>.
6df41af2 2134
c47ff5f1 2135=item No output file after > on command line
748a9306 2136
be771a83
GS
2137(F) An error peculiar to VMS. Perl handles its own command line
2138redirection, and found a lone '>' at the end of the command line, so it
2139doesn't know where you wanted to redirect stdout.
748a9306 2140
c47ff5f1 2141=item No output file after > or >> on command line
748a9306 2142
be771a83
GS
2143(F) An error peculiar to VMS. Perl handles its own command line
2144redirection, and found a '>' or a '>>' on the command line, but can't
2145find the name of the file to which to write data destined for stdout.
748a9306 2146
1ec3e8de
GS
2147=item No package name allowed for variable %s in "our"
2148
be771a83
GS
2149(F) Fully qualified variable names are not allowed in "our"
2150declarations, because that doesn't make much sense under existing
2151semantics. Such syntax is reserved for future extensions.
1ec3e8de 2152
a0d0e21e
LW
2153=item No Perl script found in input
2154
2155(F) You called C<perl -x>, but no line was found in the file beginning
2156with #! and containing the word "perl".
2157
2158=item No setregid available
2159
2160(F) Configure didn't find anything resembling the setregid() call for
2161your system.
2162
2163=item No setreuid available
2164
2165(F) Configure didn't find anything resembling the setreuid() call for
2166your system.
2167
a67e862a 2168=item No space allowed after -%c
a0d0e21e 2169
be771a83
GS
2170(F) The argument to the indicated command line switch must follow
2171immediately after the switch, without intervening spaces.
a0d0e21e 2172
6df41af2
GS
2173=item No %s specified for -%c
2174
2175(F) The indicated command line switch needs a mandatory argument, but
2176you haven't specified one.
2177
2178=item No such pipe open
2179
2180(P) An error peculiar to VMS. The internal routine my_pclose() tried to
be771a83
GS
2181close a pipe which hadn't been opened. This should have been caught
2182earlier as an attempt to close an unopened filehandle.
6df41af2 2183
88e9b055 2184=item No such pseudo-hash field "%s"
57079c46 2185
88e9b055 2186(F) You tried to access an array as a hash, but the field name used is
57079c46
GA
2187not defined. The hash at index 0 should map all valid field names to
2188array indices for that to work.
2189
88e9b055 2190=item No such pseudo-hash field "%s" in variable %s of type %s
f1192cee 2191
be771a83
GS
2192(F) You tried to access a field of a typed variable where the type does
2193not know about the field name. The field names are looked up in the
2194%FIELDS hash in the type package at compile time. The %FIELDS hash is
2195%usually set up with the 'fields' pragma.
f1192cee 2196
a0d0e21e
LW
2197=item No such signal: SIG%s
2198
be771a83
GS
2199(W signal) You specified a signal name as a subscript to %SIG that was
2200not recognized. Say C<kill -l> in your shell to see the valid signal
2201names on your system.
a0d0e21e
LW
2202
2203=item Not a CODE reference
2204
2205(F) Perl was trying to evaluate a reference to a code value (that is, a
2206subroutine), but found a reference to something else instead. You can
be771a83
GS
2207use the ref() function to find out what kind of ref it really was. See
2208also L<perlref>.
a0d0e21e
LW
2209
2210=item Not a format reference
2211
2212(F) I'm not sure how you managed to generate a reference to an anonymous
2213format, but this indicates you did, and that it didn't exist.
2214
2215=item Not a GLOB reference
2216
be771a83
GS
2217(F) Perl was trying to evaluate a reference to a "typeglob" (that is, a
2218symbol table entry that looks like C<*foo>), but found a reference to
2219something else instead. You can use the ref() function to find out what
2220kind of ref it really was. See L<perlref>.
a0d0e21e
LW
2221
2222=item Not a HASH reference
2223
be771a83
GS
2224(F) Perl was trying to evaluate a reference to a hash value, but found a
2225reference to something else instead. You can use the ref() function to
2226find out what kind of ref it really was. See L<perlref>.
a0d0e21e 2227
6df41af2
GS
2228=item Not an ARRAY reference
2229
be771a83
GS
2230(F) Perl was trying to evaluate a reference to an array value, but found
2231a reference to something else instead. You can use the ref() function
2232to find out what kind of ref it really was. See L<perlref>.
6df41af2 2233
a0d0e21e
LW
2234=item Not a perl script
2235
2236(F) The setuid emulator requires that scripts have a well-formed #! line
2237even on machines that don't support the #! construct. The line must
2238mention perl.
2239
2240=item Not a SCALAR reference
2241
be771a83
GS
2242(F) Perl was trying to evaluate a reference to a scalar value, but found
2243a reference to something else instead. You can use the ref() function
2244to find out what kind of ref it really was. See L<perlref>.
a0d0e21e
LW
2245
2246=item Not a subroutine reference
2247
2248(F) Perl was trying to evaluate a reference to a code value (that is, a
2249subroutine), but found a reference to something else instead. You can
be771a83
GS
2250use the ref() function to find out what kind of ref it really was. See
2251also L<perlref>.
a0d0e21e 2252
e7ea3e70 2253=item Not a subroutine reference in overload table
a0d0e21e
LW
2254
2255(F) An attempt was made to specify an entry in an overloading table that
8b1a09fc 2256doesn't somehow point to a valid subroutine. See L<overload>.
a0d0e21e 2257
a0d0e21e
LW
2258=item Not enough arguments for %s
2259
2260(F) The function requires more arguments than you specified.
2261
6df41af2
GS
2262=item Not enough format arguments
2263
be771a83
GS
2264(W syntax) A format specified more picture fields than the next line
2265supplied. See L<perlform>.
6df41af2
GS
2266
2267=item %s: not found
2268
be771a83
GS
2269(A) You've accidentally run your script through the Bourne shell instead
2270of Perl. Check the #! line, or manually feed your script into Perl
2271yourself.
6df41af2
GS
2272
2273=item no UTC offset information; assuming local time is UTC
a0d0e21e 2274
6df41af2
GS
2275(S) A warning peculiar to VMS. Perl was unable to find the local
2276timezone offset, so it's assuming that local system time is equivalent
be771a83
GS
2277to UTC. If it's not, define the logical name
2278F<SYS$TIMEZONE_DIFFERENTIAL> to translate to the number of seconds which
2279need to be added to UTC to get local time.
a0d0e21e
LW
2280
2281=item Null filename used
2282
be771a83
GS
2283(F) You can't require the null filename, especially because on many
2284machines that means the current directory! See L<perlfunc/require>.
a0d0e21e 2285
6df41af2
GS
2286=item NULL OP IN RUN
2287
be771a83
GS
2288(P debugging) Some internal routine called run() with a null opcode
2289pointer.
6df41af2 2290
55497cff
PP
2291=item Null picture in formline
2292
2293(F) The first argument to formline must be a valid format picture
2294specification. It was found to be empty, which probably means you
2295supplied it an uninitialized value. See L<perlform>.
2296
a0d0e21e
LW
2297=item Null realloc
2298
2299(P) An attempt was made to realloc NULL.
2300
2301=item NULL regexp argument
2302
5f05dabc 2303(P) The internal pattern matching routines blew it big time.
a0d0e21e
LW
2304
2305=item NULL regexp parameter
2306
2307(P) The internal pattern matching routines are out of their gourd.
2308
fc36a67e
PP
2309=item Number too long
2310
be771a83
GS
2311(F) Perl limits the representation of decimal numbers in programs to
2312about about 250 characters. You've exceeded that length. Future
2313versions of Perl are likely to eliminate this arbitrary limitation. In
2314the meantime, try using scientific notation (e.g. "1e6" instead of
2315"1_000_000").
fc36a67e 2316
6df41af2
GS
2317=item Octal number in vector unsupported
2318
be771a83
GS
2319(F) Numbers with a leading C<0> are not currently allowed in vectors.
2320The octal number interpretation of such numbers may be supported in a
2321future version.
6df41af2 2322
252aa082
JH
2323=item Octal number > 037777777777 non-portable
2324
75b44862 2325(W portable) The octal number you specified is larger than 2**32-1
be771a83
GS
2326(4294967295) and therefore non-portable between systems. See
2327L<perlport> for more on portability concerns.
252aa082
JH
2328
2329See also L<perlport> for writing portable code.
2330
6ad11d81
JH
2331=item Odd number of arguments for overload::constant
2332
2333(W) The call to overload::constant contained an odd number of arguments.
2334The arguments should come in pairs.
2335
1930e939 2336=item Odd number of elements in hash assignment
a0d0e21e 2337
be771a83
GS
2338(W misc) You specified an odd number of elements to initialize a hash,
2339which is odd, because hashes come in key/value pairs.
a0d0e21e 2340
bbce6d69
PP
2341=item Offset outside string
2342
2343(F) You tried to do a read/write/send/recv operation with an offset
be771a83
GS
2344pointing outside the buffer. This is difficult to imagine. The sole
2345exception to this is that C<sysread()>ing past the buffer will extend
2346the buffer and zero pad the new area.
bbce6d69 2347
9ddeeac9
JH
2348=item -%s on unopened filehandle %s
2349
2350(W unopened) You tried to invoke a file test operator on a filehandle
c289d2f7 2351that isn't open. Check your control flow. See also L<perlfunc/-X>.
9ddeeac9 2352
c289d2f7 2353=item %s() on unopened %s
2dd78f96
JH
2354
2355(W unopened) An I/O operation was attempted on a filehandle that was
2356never initialized. You need to do an open(), a sysopen(), or a socket()
2357call, or call a constructor from the FileHandle package.
2358
a0d0e21e
LW
2359=item oops: oopsAV
2360
e476b1b5 2361(S internal) An internal warning that the grammar is screwed up.
a0d0e21e
LW
2362
2363=item oops: oopsHV
2364
e476b1b5 2365(S internal) An internal warning that the grammar is screwed up.
a0d0e21e 2366
56f7f34b 2367=item Operation `%s': no method found, %s
44a8e56a 2368
be771a83
GS
2369(F) An attempt was made to perform an overloaded operation for which no
2370handler was defined. While some handlers can be autogenerated in terms
2371of other handlers, there is no default handler for any operation, unless
2372C<fallback> overloading key is specified to be true. See L<overload>.
44a8e56a 2373
748a9306
LW
2374=item Operator or semicolon missing before %s
2375
be771a83
GS
2376(S ambiguous) You used a variable or subroutine call where the parser
2377was expecting an operator. The parser has assumed you really meant to
2378use an operator, but this is highly likely to be incorrect. For
2379example, if you say "*foo *foo" it will be interpreted as if you said
2380"*foo * 'foo'".
748a9306 2381
6df41af2
GS
2382=item "our" variable %s redeclared
2383
be771a83
GS
2384(W misc) You seem to have already declared the same global once before
2385in the current lexical scope.
6df41af2 2386
a80b8354
GS
2387=item Out of memory!
2388
2389(X) The malloc() function returned 0, indicating there was insufficient
be771a83
GS
2390remaining memory (or virtual memory) to satisfy the request. Perl has
2391no option but to exit immediately.
a80b8354 2392
6df41af2 2393=item Out of memory during "large" request for %s
a0d0e21e 2394
6df41af2
GS
2395(F) The malloc() function returned 0, indicating there was insufficient
2396remaining memory (or virtual memory) to satisfy the request. However,
be771a83
GS
2397the request was judged large enough (compile-time default is 64K), so a
2398possibility to shut down by trapping this error is granted.
a0d0e21e 2399
1b979e0a 2400=item Out of memory during request for %s
a0d0e21e 2401
be771a83
GS
2402(X|F) The malloc() function returned 0, indicating there was
2403insufficient remaining memory (or virtual memory) to satisfy the
2404request.
eff9c6e2
CS
2405
2406The request was judged to be small, so the possibility to trap it
2407depends on the way perl was compiled. By default it is not trappable.
be771a83
GS
2408However, if compiled for this, Perl may use the contents of C<$^M> as an
2409emergency pool after die()ing with this message. In this case the error
b022d2d2
IZ
2410is trappable I<once>, and the error message will include the line and file
2411where the failed request happened.
55497cff 2412
1b979e0a
IZ
2413=item Out of memory during ridiculously large request
2414
2415(F) You can't allocate more than 2^31+"small amount" bytes. This error
be771a83
GS
2416is most likely to be caused by a typo in the Perl program. e.g.,
2417C<$arr[time]> instead of C<$arr[$time]>.
1b979e0a 2418
6df41af2
GS
2419=item Out of memory for yacc stack
2420
be771a83
GS
2421(F) The yacc parser wanted to grow its stack so it could continue
2422parsing, but realloc() wouldn't give it more memory, virtual or
2423otherwise.
6df41af2
GS
2424
2425=item @ outside of string
2426
2427(F) You had a pack template that specified an absolute position outside
2428the string being unpacked. See L<perlfunc/pack>.
2429
2430=item %s package attribute may clash with future reserved word: %s
2431
be771a83
GS
2432(W reserved) A lowercase attribute name was used that had a
2433package-specific handler. That name might have a meaning to Perl itself
2434some day, even though it doesn't yet. Perhaps you should use a
2435mixed-case attribute name, instead. See L<attributes>.
6df41af2 2436
5b027e89
RGS
2437=item Package '%s' not found (did you use the incorrect case?)
2438
2439(W misc) You included a package file via C<use>, but the package name
5b7c7e90 2440did not match the file name. It's possible that you misspelled the
5b027e89
RGS
2441package name.
2442
a0d0e21e
LW
2443=item page overflow
2444
be771a83
GS
2445(W io) A single call to write() produced more lines than can fit on a
2446page. See L<perlform>.
a0d0e21e 2447
6df41af2
GS
2448=item panic: %s
2449
2450(P) An internal error.
2451
a0d0e21e
LW
2452=item panic: ck_grep
2453
2454(P) Failed an internal consistency check trying to compile a grep.
2455
2456=item panic: ck_split
2457
2458(P) Failed an internal consistency check trying to compile a split.
2459
2460=item panic: corrupt saved stack index
2461
be771a83
GS
2462(P) The savestack was requested to restore more localized values than
2463there are in the savestack.
a0d0e21e 2464
810b8aa5
GS
2465=item panic: del_backref
2466
2467(P) Failed an internal consistency check while trying to reset a weak
2468reference.
2469
a0d0e21e
LW
2470=item panic: die %s
2471
2472(P) We popped the context stack to an eval context, and then discovered
2473it wasn't an eval context.
2474
2269b42e 2475=item panic: pp_match
a0d0e21e 2476
be771a83
GS
2477(P) The internal pp_match() routine was called with invalid operational
2478data.
a0d0e21e 2479
a0d0e21e
LW
2480=item panic: do_subst
2481
be771a83
GS
2482(P) The internal pp_subst() routine was called with invalid operational
2483data.
a0d0e21e 2484
2269b42e 2485=item panic: do_trans_%s
a0d0e21e 2486
2269b42e 2487(P) The internal do_trans routines were called with invalid operational
be771a83 2488data.
a0d0e21e 2489
c635e13b
PP
2490=item panic: frexp
2491
2492(P) The library function frexp() failed, making printf("%f") impossible.
2493
a0d0e21e
LW
2494=item panic: goto
2495
2496(P) We popped the context stack to a context with the specified label,
2497and then discovered it wasn't a context we know how to do a goto in.
2498
2499=item panic: INTERPCASEMOD
2500
2501(P) The lexer got into a bad state at a case modifier.
2502
2503=item panic: INTERPCONCAT
2504
2505(P) The lexer got into a bad state parsing a string with brackets.
2506
e446cec8
IZ
2507=item panic: kid popen errno read
2508
2509(F) forked child returned an incomprehensible message about its errno.
2510
a0d0e21e
LW
2511=item panic: last
2512
2513(P) We popped the context stack to a block context, and then discovered
2514it wasn't a block context.
2515
2516=item panic: leave_scope clearsv
2517
be771a83
GS
2518(P) A writable lexical variable became read-only somehow within the
2519scope.
a0d0e21e
LW
2520
2521=item panic: leave_scope inconsistency
2522
2523(P) The savestack probably got out of sync. At least, there was an
2524invalid enum on the top of it.
2525
810b8aa5
GS
2526=item panic: magic_killbackrefs
2527
2528(P) Failed an internal consistency check while trying to reset all weak
2529references to an object.
2530
6df41af2
GS
2531=item panic: malloc
2532
2533(P) Something requested a negative number of bytes of malloc.
2534
a0d0e21e
LW
2535=item panic: mapstart
2536
2537(P) The compiler is screwed up with respect to the map() function.
2538
2539=item panic: null array
2540
2541(P) One of the internal array routines was passed a null AV pointer.
2542
2543=item panic: pad_alloc
2544
2545(P) The compiler got confused about which scratch pad it was allocating
2546and freeing temporaries and lexicals from.
2547
2548=item panic: pad_free curpad
2549
2550(P) The compiler got confused about which scratch pad it was allocating
2551and freeing temporaries and lexicals from.
2552
2553=item panic: pad_free po
2554
2555(P) An invalid scratch pad offset was detected internally.
2556
2557=item panic: pad_reset curpad
2558
2559(P) The compiler got confused about which scratch pad it was allocating
2560and freeing temporaries and lexicals from.
2561
2562=item panic: pad_sv po
2563
2564(P) An invalid scratch pad offset was detected internally.
2565
2566=item panic: pad_swipe curpad
2567
2568(P) The compiler got confused about which scratch pad it was allocating
2569and freeing temporaries and lexicals from.
2570
2571=item panic: pad_swipe po
2572
2573(P) An invalid scratch pad offset was detected internally.
2574
2575=item panic: pp_iter
2576
2577(P) The foreach iterator got called in a non-loop context frame.
2578
2269b42e
JH
2579=item panic: pp_split
2580
2581(P) Something terrible went wrong in setting up for the split.
2582
a0d0e21e
LW
2583=item panic: realloc
2584
2585(P) Something requested a negative number of bytes of realloc.
2586
2587=item panic: restartop
2588
2589(P) Some internal routine requested a goto (or something like it), and
2590didn't supply the destination.
2591
2592=item panic: return
2593
2594(P) We popped the context stack to a subroutine or eval context, and
2595then discovered it wasn't a subroutine or eval context.
2596
2597=item panic: scan_num
2598
2599(P) scan_num() got called on something that wasn't a number.
2600
2601=item panic: sv_insert
2602
2603(P) The sv_insert() routine was told to remove more string than there
2604was string.
2605
2606=item panic: top_env
2607
6224f72b 2608(P) The compiler attempted to do a goto, or something weird like that.
a0d0e21e
LW
2609
2610=item panic: yylex
2611
2612(P) The lexer got into a bad state while processing a case modifier.
2613
dea0fc0b
JH
2614=item panic: utf16_to_utf8: odd bytelen
2615
2616(P) Something tried to call utf16_to_utf8 with an odd (as opposed
64977eb6 2617to even) byte length.
dea0fc0b 2618
7b8d334a 2619=item Parentheses missing around "%s" list
a0d0e21e 2620
e476b1b5 2621(W parenthesis) You said something like
a0d0e21e
LW
2622
2623 my $foo, $bar = @_;
2624
2625when you meant
2626
2627 my ($foo, $bar) = @_;
2628
54884818 2629Remember that "my", "our", and "local" bind tighter than comma.
a0d0e21e 2630
75b44862 2631=item Perl %s required--this is only version %s, stopped
a0d0e21e 2632
be771a83
GS
2633(F) The module in question uses features of a version of Perl more
2634recent than the currently running version. How long has it been since
2635you upgraded, anyway? See L<perlfunc/require>.
a0d0e21e 2636
6df41af2
GS
2637=item PERL_SH_DIR too long
2638
2639(F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
fecfaeb8 2640C<sh>-shell in. See "PERL_SH_DIR" in L<perlos2>.
6df41af2
GS
2641
2642=item perl: warning: Setting locale failed.
2643
2644(S) The whole warning message will look something like:
2645
2646 perl: warning: Setting locale failed.
2647 perl: warning: Please check that your locale settings:
2648 LC_ALL = "En_US",
2649 LANG = (unset)
2650 are supported and installed on your system.
2651 perl: warning: Falling back to the standard locale ("C").
2652
2653Exactly what were the failed locale settings varies. In the above the
2654settings were that the LC_ALL was "En_US" and the LANG had no value.
0ea6b70f
JH
2655This error means that Perl detected that you and/or your operating
2656system supplier and/or system administrator have set up the so-called
2657locale system but Perl could not use those settings. This was not
2658dead serious, fortunately: there is a "default locale" called "C" that
2659Perl can and will use, the script will be run. Before you really fix
2660the problem, however, you will get the same error message each time
2661you run Perl. How to really fix the problem can be found in
2662L<perllocale> section B<LOCALE PROBLEMS>.
6df41af2 2663
bccbfa77
NC
2664=item perlio: argument list not closed for layer "%s"
2665
64977eb6 2666(S) When pushing a layer with arguments onto the Perl I/O system you forgot
bccbfa77 2667the ) that closes the argument list. (Layers take care of transforming
64977eb6
NC
2668data between external and internal representations.) Perl stopped parsing
2669the layer list at this point and did not attempt to push this layer.
2670If your program didn't explicitly request the failing operation, it may be
2671the result of the value of the environment variable PERLIO.
2672
2673=item perlio: invalid separator character %s in attribute list
2674
2675(S) When pushing layers onto the Perl I/O system, something other than a
2676colon or whitespace was seen between the elements of an layer list.
2677If the previous attribute had a parenthesised parameter list, perhaps that
2678list was terminated too soon.
bccbfa77 2679
ef0f9817
DD
2680=item perlio: unknown layer "%s"
2681
2682(S) An attempt was made to push an unknown layer onto the Perl I/O
2683system. (Layers take care of transforming data between external and
2684internal representations.) Note that some layers, such as C<mmap>,
2685are not supported in all environments. If your program didn't
2686explicitly request the failing operation, it may be the result of the
2687value of the environment variable PERLIO.
2688
a0d0e21e
LW
2689=item Permission denied
2690
2691(F) The setuid emulator in suidperl decided you were up to no good.
2692
bd3fa61c 2693=item pid %x not a child
748a9306 2694
be771a83
GS
2695(W exec) A warning peculiar to VMS. Waitpid() was asked to wait for a
2696process which isn't a subprocess of the current process. While this is
2697fine from VMS' perspective, it's probably not what you intended.
748a9306 2698
5cd5c422
RB
2699=item POSIX syntax [%s] belongs inside character classes in regex;
2700
2701marked by <-- HERE in m/%s/
b45f050a
JF
2702
2703(W unsafe) The character class constructs [: :], [= =], and [. .] go
7253e4e3
RK
2704I<inside> character classes, the [] are part of the construct, for example:
2705/[012[:alpha:]345]/. Note that [= =] and [. .] are not currently
2706implemented; they are simply placeholders for future extensions and will
2707cause fatal errors. The <-- HERE shows in the regular expression about
2708where the problem was discovered. See L<perlre>.
b45f050a 2709
5cd5c422
RB
2710=item POSIX syntax [. .] is reserved for future extensions in regex;
2711
2712marked by <-- HERE in m/%s/
b45f050a
JF
2713
2714(F regexp) Within regular expression character classes ([]) the syntax
7253e4e3
RK
2715beginning with "[." and ending with ".]" is reserved for future extensions.
2716If you need to represent those character sequences inside a regular
2717expression character class, just quote the square brackets with the
2718backslash: "\[." and ".\]". The <-- HERE shows in the regular expression
2719about where the problem was discovered. See L<perlre>.
b45f050a 2720
5cd5c422
RB
2721=item POSIX syntax [= =] is reserved for future extensions in regex;
2722
2723marked by <-- HERE in m/%s/
b45f050a 2724
7253e4e3
RK
2725(F) Within regular expression character classes ([]) the syntax beginning
2726with "[=" and ending with "=]" is reserved for future extensions. If you
2727need to represent those character sequences inside a regular expression
2728character class, just quote the square brackets with the backslash: "\[="
2729and "=\]". The <-- HERE shows in the regular expression about where the
2730problem was discovered. See L<perlre>.
b45f050a 2731
5cd5c422
RB
2732=item POSIX class [:%s:] unknown in regex;
2733
2734marked by <-- HERE in m/%s/
b45f050a 2735
7253e4e3
RK
2736(F) The class in the character class [: :] syntax is unknown. The <-- HERE
2737shows in the regular expression about where the problem was discovered.
2738See L<perlre>.
b45f050a 2739
a0d0e21e
LW
2740=item POSIX getpgrp can't take an argument
2741
81777298 2742(F) Your system has POSIX getpgrp(), which takes no argument, unlike
a0d0e21e
LW
2743the BSD version, which takes a pid.
2744
bbce6d69
PP
2745=item Possible attempt to put comments in qw() list
2746
e476b1b5 2747(W qw) qw() lists contain items separated by whitespace; as with literal
75b44862 2748strings, comment characters are not ignored, but are instead treated as
be771a83
GS
2749literal data. (You may have used different delimiters than the
2750parentheses shown here; braces are also frequently used.)
bbce6d69 2751
774d564b
PP
2752You probably wrote something like this:
2753
54310121 2754 @list = qw(
774d564b 2755 a # a comment
bbce6d69 2756 b # another comment
774d564b 2757 );
bbce6d69
PP
2758
2759when you should have written this:
2760
774d564b 2761 @list = qw(
54310121
PP
2762 a
2763 b
774d564b
PP
2764 );
2765
2766If you really want comments, build your list the
2767old-fashioned way, with quotes and commas:
2768
2769 @list = (
2770 'a', # a comment
2771 'b', # another comment
2772 );
bbce6d69
PP
2773
2774=item Possible attempt to separate words with commas
2775
be771a83
GS
2776(W qw) qw() lists contain items separated by whitespace; therefore
2777commas aren't needed to separate the items. (You may have used
2778different delimiters than the parentheses shown here; braces are also
2779frequently used.)
bbce6d69 2780
54310121 2781You probably wrote something like this:
bbce6d69 2782
774d564b
PP
2783 qw! a, b, c !;
2784
2785which puts literal commas into some of the list items. Write it without
2786commas if you don't want them to appear in your data:
bbce6d69 2787
774d564b 2788 qw! a b c !;
bbce6d69 2789
a0d0e21e
LW
2790=item Possible memory corruption: %s overflowed 3rd argument
2791
2792(F) An ioctl() or fcntl() returned more than Perl was bargaining for.
2793Perl guesses a reasonable buffer size, but puts a sentinel byte at the
2794end of the buffer just in case. This sentinel byte got clobbered, and
2795Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
2796
18623440
PS
2797=item Possible unintended interpolation of %s in string
2798
2799(W ambiguous) You said something like `@foo' in a double-quoted string
2800but there was no array C<@foo> in scope at the time. If you wanted
2801literally to say `@foo' then backslash it: `\@foo'; otherwise find out
2802what happened to the array you apparently lost track of.
2803
6df41af2
GS
2804=item Possible Y2K bug: %s
2805
2806(W y2k) You are concatenating the number 19 with another number, which
2807could be a potential Year 2000 problem.
2808
8cd79558
GS
2809=item pragma "attrs" is deprecated, use "sub NAME : ATTRS" instead
2810
a1063b2d 2811(D deprecated) You have written something like this:
8cd79558
GS
2812
2813 sub doit
2814 {
2815 use attrs qw(locked);
2816 }
2817
2818You should use the new declaration syntax instead.
2819
2820 sub doit : locked
2821 {
2822 ...
2823
2824The C<use attrs> pragma is now obsolete, and is only provided for
2825backward-compatibility. See L<perlsub/"Subroutine Attributes">.
2826
a0d0e21e
LW
2827=item Precedence problem: open %s should be open(%s)
2828
e476b1b5 2829(S precedence) The old irregular construct
cb1a09d0 2830
a0d0e21e
LW
2831 open FOO || die;
2832
2833is now misinterpreted as
2834
2835 open(FOO || die);
2836
be771a83
GS
2837because of the strict regularization of Perl 5's grammar into unary and
2838list operators. (The old open was a little of both.) You must put
2839parentheses around the filehandle, or use the new "or" operator instead
2840of "||".
a0d0e21e 2841
3cdd684c
TP
2842=item Premature end of script headers
2843
2844See Server error.
2845
6df41af2
GS
2846=item printf() on closed filehandle %s
2847
be771a83 2848(W closed) The filehandle you're writing to got itself closed sometime
c289d2f7 2849before now. Check your control flow.
6df41af2 2850
9a7dcd9c 2851=item print() on closed filehandle %s
a0d0e21e 2852
be771a83 2853(W closed) The filehandle you're printing on got itself closed sometime
c289d2f7 2854before now. Check your control flow.
a0d0e21e 2855
6df41af2 2856=item Process terminated by SIG%s
a0d0e21e 2857
6df41af2
GS
2858(W) This is a standard message issued by OS/2 applications, while *nix
2859applications die in silence. It is considered a feature of the OS/2
2860port. One can easily disable this by appropriate sighandlers, see
2861L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"
fecfaeb8 2862in L<perlos2>.
a0d0e21e 2863
3fe9a6f1 2864=item Prototype mismatch: %s vs %s
4633a7c4 2865
be771a83
GS
2866(S unsafe) The subroutine being declared or defined had previously been
2867declared or defined with a different function prototype.
4633a7c4 2868
5cd5c422
RB
2869=item Quantifier in {,} bigger than %d in regex;
2870
2871marked by <-- HERE in m/%s/
9baa0206 2872
b45f050a 2873(F) There is currently a limit to the size of the min and max values of the
7253e4e3 2874{min,max} construct. The <-- HERE shows in the regular expression about where
b45f050a 2875the problem was discovered. See L<perlre>.
9baa0206 2876
5cd5c422
RB
2877=item Quantifier unexpected on zero-length expression;
2878
2879marked by <-- HERE in m/%s/
9baa0206 2880
b45f050a
JF
2881(W regexp) You applied a regular expression quantifier in a place where
2882it makes no sense, such as on a zero-width assertion. Try putting the
2883quantifier inside the assertion instead. For example, the way to match
2884"abc" provided that it is followed by three repetitions of "xyz" is
2885C</abc(?=(?:xyz){3})/>, not C</abc(?=xyz){3}/>.
9baa0206 2886
7253e4e3
RK
2887The <-- HERE shows in the regular expression about where the problem was
2888discovered.
2889
89ea2908
GA
2890=item Range iterator outside integer range
2891
2892(F) One (or both) of the numeric arguments to the range operator ".."
2893are outside the range which can be represented by integers internally.
be771a83
GS
2894One possible workaround is to force Perl to use magical string increment
2895by prepending "0" to your numbers.
89ea2908 2896
9a7dcd9c 2897=item readline() on closed filehandle %s
a0d0e21e 2898
75b44862 2899(W closed) The filehandle you're reading from got itself closed sometime
c289d2f7 2900before now. Check your control flow.
a0d0e21e 2901
6df41af2
GS
2902=item Reallocation too large: %lx
2903
2904(F) You can't allocate more than 64K on an MS-DOS machine.
2905
4ad56ec9
IZ
2906=item realloc() of freed memory ignored
2907
be771a83
GS
2908(S malloc) An internal routine called realloc() on something that had
2909already been freed.
4ad56ec9 2910
a0d0e21e
LW
2911=item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
2912
be771a83
GS
2913(F debugging) You can't use the B<-D> option unless the code to produce
2914the desired output is compiled into Perl, which entails some overhead,
a0d0e21e
LW
2915which is why it's currently left out of your copy.
2916
3e0ccd42 2917=item Recursive inheritance detected in package '%s'
a0d0e21e
LW
2918
2919(F) More than 100 levels of inheritance were used. Probably indicates
2920an unintended loop in your inheritance hierarchy.
2921
7a4340ed 2922=item Recursive inheritance detected while looking for method %s
3e0ccd42 2923
be771a83
GS
2924(F) More than 100 levels of inheritance were encountered while invoking
2925a method. Probably indicates an unintended loop in your inheritance
2926hierarchy.
3e0ccd42 2927
1930e939
TP
2928=item Reference found where even-sized list expected
2929
be771a83
GS
2930(W misc) You gave a single reference where Perl was expecting a list
2931with an even number of elements (for assignment to a hash). This usually
2932means that you used the anon hash constructor when you meant to use
2933parens. In any case, a hash requires key/value B<pairs>.
7b8d334a
GS
2934
2935 %hash = { one => 1, two => 2, }; # WRONG
2936 %hash = [ qw/ an anon array / ]; # WRONG
2937 %hash = ( one => 1, two => 2, ); # right
2938 %hash = qw( one 1 two 2 ); # also fine
2939
810b8aa5
GS
2940=item Reference is already weak
2941
e476b1b5 2942(W misc) You have attempted to weaken a reference that is already weak.
810b8aa5
GS
2943Doing so has no effect.
2944
a0d0e21e
LW
2945=item Reference miscount in sv_replace()
2946
be771a83
GS
2947(W internal) The internal sv_replace() function was handed a new SV with
2948a reference count of other than 1.
a0d0e21e 2949
5cd5c422
RB
2950=item Reference to nonexistent group in regex;
2951
2952marked by <-- HERE in m/%s/
b45f050a
JF
2953
2954(F) You used something like C<\7> in your regular expression, but there are
2955not at least seven sets of capturing parentheses in the expression. If you
2956wanted to have the character with value 7 inserted into the regular expression,
2957prepend a zero to make the number at least two digits: C<\07>
9baa0206 2958
7253e4e3 2959The <-- HERE shows in the regular expression about where the problem was
b45f050a 2960discovered.
9baa0206 2961
a0d0e21e
LW
2962=item regexp memory corruption
2963
2964(P) The regular expression engine got confused by what the regular
2965expression compiler gave it.
2966
b45f050a 2967=item Regexp out of space
a0d0e21e 2968
be771a83
GS
2969(P) A "can't happen" error, because safemalloc() should have caught it
2970earlier.
a0d0e21e 2971
7a95317d
GS
2972=item Repeat count in pack overflows
2973
be771a83
GS
2974(F) You can't specify a repeat count so large that it overflows your
2975signed integers. See L<perlfunc/pack>.
7a95317d
GS
2976
2977=item Repeat count in unpack overflows
2978
be771a83
GS
2979(F) You can't specify a repeat count so large that it overflows your
2980signed integers. See L<perlfunc/unpack>.
7a95317d 2981
a0d0e21e
LW
2982=item Reversed %s= operator
2983
be771a83
GS
2984(W syntax) You wrote your assignment operator backwards. The = must
2985always comes last, to avoid ambiguity with subsequent unary operators.
a0d0e21e
LW
2986
2987=item Runaway format
2988
2989(F) Your format contained the ~~ repeat-until-blank sequence, but it
2990produced 200 lines at once, and the 200th line looked exactly like the
2991199th line. Apparently you didn't arrange for the arguments to exhaust
2992themselves, either by using ^ instead of @ (for scalar variables), or by
2993shifting or popping (for array variables). See L<perlform>.
2994
2995=item Scalar value @%s[%s] better written as $%s[%s]
2996
be771a83
GS
2997(W syntax) You've used an array slice (indicated by @) to select a
2998single element of an array. Generally it's better to ask for a scalar
2999value (indicated by $). The difference is that C<$foo[&bar]> always
3000behaves like a scalar, both when assigning to it and when evaluating its
3001argument, while C<@foo[&bar]> behaves like a list when you assign to it,
3002and provides a list context to its subscript, which can do weird things
3003if you're expecting only one subscript.
a0d0e21e 3004
748a9306 3005On the other hand, if you were actually hoping to treat the array
5f05dabc 3006element as a list, you need to look into how references work, because
748a9306
LW
3007Perl will not magically convert between scalars and lists for you. See
3008L<perlref>.
3009
a6006777
PP
3010=item Scalar value @%s{%s} better written as $%s{%s}
3011
75b44862 3012(W syntax) You've used a hash slice (indicated by @) to select a single
be771a83
GS
3013element of a hash. Generally it's better to ask for a scalar value
3014(indicated by $). The difference is that C<$foo{&bar}> always behaves
3015like a scalar, both when assigning to it and when evaluating its
3016argument, while C<@foo{&bar}> behaves like a list when you assign to it,
3017and provides a list context to its subscript, which can do weird things
3018if you're expecting only one subscript.
3019
3020On the other hand, if you were actually hoping to treat the hash element
3021as a list, you need to look into how references work, because Perl will
3022not magically convert between scalars and lists for you. See
a6006777
PP
3023L<perlref>.
3024
3e2f796a
NIS
3025=item Scalars leaked: %d
3026
3027(P) Something went wrong in Perl's internal bookkeeping of scalars:
3028not all scalar variables were deallocated by the time Perl exited.
3029What this usually indicates is a memory leak, which is of course bad,
3030especially if the Perl program is intended to be long-running.
3031
a0d0e21e
LW
3032=item Script is not setuid/setgid in suidperl
3033
54310121
PP
3034(F) Oddly, the suidperl program was invoked on a script without a setuid
3035or setgid bit set. This doesn't make much sense.
a0d0e21e
LW
3036
3037=item Search pattern not terminated
3038
3039(F) The lexer couldn't find the final delimiter of a // or m{}
3040construct. Remember that bracketing delimiters count nesting level.
fb73857a 3041Missing the leading C<$> from a variable C<$m> may cause this error.
a0d0e21e 3042
9ddeeac9 3043=item %sseek() on unopened filehandle
a0d0e21e 3044
be771a83
GS
3045(W unopened) You tried to use the seek() or sysseek() function on a
3046filehandle that was either never opened or has since been closed.
a0d0e21e
LW
3047
3048=item select not implemented
3049
3050(F) This machine doesn't implement the select() system call.
3051
ae21d580 3052=item Self-ties of arrays and hashes are not supported
68a4a7e4 3053
ae21d580
JH
3054(F) Self-ties are of arrays and hashes are not supported in
3055the current implementation.
68a4a7e4 3056
6df41af2 3057=item Semicolon seems to be missing
a0d0e21e 3058
75b44862
GS
3059(W semicolon) A nearby syntax error was probably caused by a missing
3060semicolon, or possibly some other missing operator, such as a comma.
a0d0e21e
LW
3061
3062=item semi-panic: attempt to dup freed string
3063
be771a83
GS
3064(S internal) The internal newSVsv() routine was called to duplicate a
3065scalar that had previously been marked as free.
a0d0e21e 3066
6df41af2 3067=item sem%s not implemented
a0d0e21e 3068
6df41af2 3069(F) You don't have System V semaphore IPC on your system.
a0d0e21e 3070
69282e91 3071=item send() on closed socket %s
a0d0e21e 3072
be771a83 3073(W closed) The socket you're sending to got itself closed sometime
c289d2f7 3074before now. Check your control flow.
a0d0e21e 3075
7253e4e3 3076=item Sequence (? incomplete in regex; marked by <-- HERE in m/%s/
7b8d334a 3077
7253e4e3 3078(F) A regular expression ended with an incomplete extension (?. The <-- HERE
b45f050a 3079shows in the regular expression about where the problem was discovered. See
be771a83 3080L<perlre>.
1b1626e4 3081
5cd5c422
RB
3082=item Sequence (?{...}) not terminated or not {}-balanced in regex;
3083
3084marked by <-- HERE in m/%s/
b45f050a
JF
3085
3086(F) If the contents of a (?{...}) clause contains braces, they must balance
7253e4e3
RK
3087for Perl to properly detect the end of the clause. The <-- HERE shows in
3088the regular expression about where the problem was discovered. See
3089L<perlre>.
a0d0e21e 3090
5cd5c422
RB
3091=item Sequence (?%s...) not implemented in regex;
3092
3093marked by <-- HERE in m/%s/
a0d0e21e 3094
b45f050a 3095(F) A proposed regular expression extension has the character reserved but
7253e4e3 3096has not yet been written. The <-- HERE shows in the regular expression about
b45f050a
JF
3097where the problem was discovered. See L<perlre>.
3098
5cd5c422
RB
3099=item Sequence (?%s...) not recognized in regex;
3100
3101marked by <-- HERE in m/%s/
a0d0e21e 3102
7253e4e3
RK
3103(F) You used a regular expression extension that doesn't make sense. The
3104<-- HERE shows in the regular expression about where the problem was
3105discovered. See L<perlre>.
a0d0e21e 3106
5cd5c422
RB
3107=item Sequence (?#... not terminated in regex;
3108
3109marked by <-- HERE in m/%s/
6df41af2
GS
3110
3111(F) A regular expression comment must be terminated by a closing
7253e4e3
RK
3112parenthesis. Embedded parentheses aren't allowed. The <-- HERE shows in
3113the regular expression about where the problem was discovered. See
3114L<perlre>.
6df41af2
GS
3115
3116=item 500 Server error
3117
3118See Server error.
3119
a5f75d66
AD
3120=item Server error
3121
3cdd684c 3122This is the error message generally seen in a browser window when trying
be771a83
GS
3123to run a CGI program (including SSI) over the web. The actual error text
3124varies widely from server to server. The most frequently-seen variants
3125are "500 Server error", "Method (something) not permitted", "Document
3126contains no data", "Premature end of script headers", and "Did not
3127produce a valid header".
9607fc9c
PP
3128
3129B<This is a CGI error, not a Perl error>.
3130
be771a83
GS
3131You need to make sure your script is executable, is accessible by the
3132user CGI is running the script under (which is probably not the user
3133account you tested it under), does not rely on any environment variables
3134(like PATH) from the user it isn't running under, and isn't in a
3135location where the CGI server can't find it, basically, more or less.
3136Please see the following for more information:
9607fc9c 3137
be94a901
GS
3138 http://www.perl.com/CPAN/doc/FAQs/cgi/idiots-guide.html
3139 http://www.perl.com/CPAN/doc/FAQs/cgi/perl-cgi-faq.html
9607fc9c
PP
3140 ftp://rtfm.mit.edu/pub/usenet/news.answers/www/cgi-faq
3141 http://hoohoo.ncsa.uiuc.edu/cgi/interface.html
3142 http://www-genome.wi.mit.edu/WWW/faqs/www-security-faq.html
a5f75d66 3143
be94a901
GS
3144You should also look at L<perlfaq9>.
3145
a0d0e21e
LW
3146=item setegid() not implemented
3147
be771a83
GS
3148(F) You tried to assign to C<$)>, and your operating system doesn't
3149support the setegid() system call (or equivalent), or at least Configure
3150didn't think so.
a0d0e21e
LW
3151
3152=item seteuid() not implemented
3153
be771a83
GS
3154(F) You tried to assign to C<< $> >>, and your operating system doesn't
3155support the seteuid() system call (or equivalent), or at least Configure
3156didn't think so.
a0d0e21e 3157
81777298
GS
3158=item setpgrp can't take arguments
3159
be771a83
GS
3160(F) Your system has the setpgrp() from BSD 4.2, which takes no
3161arguments, unlike POSIX setpgid(), which takes a process ID and process
3162group ID.
81777298 3163
a0d0e21e
LW
3164=item setrgid() not implemented
3165
be771a83
GS
3166(F) You tried to assign to C<$(>, and your operating system doesn't
3167support the setrgid() system call (or equivalent), or at least Configure
3168didn't think so.
a0d0e21e
LW
3169
3170=item setruid() not implemented
3171
be771a83
GS
3172(F) You tried to assign to C<$<>, and your operating system doesn't
3173support the setruid() system call (or equivalent), or at least Configure
3174didn't think so.
a0d0e21e 3175
6df41af2
GS
3176=item setsockopt() on closed socket %s
3177
be771a83
GS
3178(W closed) You tried to set a socket option on a closed socket. Did you
3179forget to check the return value of your socket() call? See
6df41af2
GS
3180L<perlfunc/setsockopt>.
3181
a0d0e21e
LW
3182=item Setuid/gid script is writable by world
3183
be771a83
GS
3184(F) The setuid emulator won't run a script that is writable by the
3185world, because the world might have written on it already.
a0d0e21e
LW
3186
3187=item shm%s not implemented
3188
3189(F) You don't have System V shared memory IPC on your system.
3190
6df41af2
GS
3191=item <> should be quotes
3192
3193(F) You wrote C<< require <file> >> when you should have written
3194C<require 'file'>.
3195
3196=item /%s/ should probably be written as "%s"
3197
3198(W syntax) You have used a pattern where Perl expected to find a string,
be771a83
GS
3199as in the first argument to C<join>. Perl will treat the true or false
3200result of matching the pattern against $_ as the string, which is
3201probably not what you had in mind.
6df41af2 3202
69282e91 3203=item shutdown() on closed socket %s
a0d0e21e 3204
75b44862
GS
3205(W closed) You tried to do a shutdown on a closed socket. Seems a bit
3206superfluous.
a0d0e21e 3207
f86702cc 3208=item SIG%s handler "%s" not defined
a0d0e21e 3209
be771a83
GS
3210(W signal) The signal handler named in %SIG doesn't, in fact, exist.
3211Perhaps you put it into the wrong package?
a0d0e21e
LW
3212
3213=item sort is now a reserved word
3214
3215(F) An ancient error message that almost nobody ever runs into anymore.
3216But before sort was a keyword, people sometimes used it as a filehandle.
3217
3218=item Sort subroutine didn't return a numeric value
3219
3220(F) A sort comparison routine must return a number. You probably blew
c47ff5f1 3221it by not using C<< <=> >> or C<cmp>, or by not using them correctly.
a0d0e21e
LW
3222See L<perlfunc/sort>.
3223
3224=item Sort subroutine didn't return single value
3225
3226(F) A sort comparison subroutine may not return a list value with more
3227or less than one element. See L<perlfunc/sort>.
3228
3229=item Split loop
3230
be771a83
GS
3231(P) The split was looping infinitely. (Obviously, a split shouldn't
3232iterate more times than there are characters of input, which is what
3233happened.) See L<perlfunc/split>.
a0d0e21e 3234
a0d0e21e
LW
3235=item Statement unlikely to be reached
3236
be771a83
GS
3237(W exec) You did an exec() with some statement after it other than a
3238die(). This is almost always an error, because exec() never returns
3239unless there was a failure. You probably wanted to use system()
3240instead, which does return. To suppress this warning, put the exec() in
3241a block by itself.
a0d0e21e 3242
9ddeeac9 3243=item stat() on unopened filehandle %s
6df41af2 3244
355b1299
JH
3245(W unopened) You tried to use the stat() function on a filehandle that
3246was either never opened or has since been closed.
6df41af2 3247
7a4340ed 3248=item Stub found while resolving method `%s' overloading %s
e7ea3e70 3249
be771a83
GS
3250(P) Overloading resolution over @ISA tree may be broken by importation
3251stubs. Stubs should never be implicitly created, but explicit calls to
3252C<can> may break this.
e7ea3e70 3253
a0d0e21e
LW
3254=item Subroutine %s redefined
3255
e476b1b5 3256(W redefine) You redefined a subroutine. To suppress this warning, say
a0d0e21e
LW
3257
3258 {
4438c4b7 3259 no warnings;
a0d0e21e
LW
3260 eval "sub name { ... }";
3261 }
3262
3263=item Substitution loop
3264
be771a83
GS
3265(P) The substitution was looping infinitely. (Obviously, a substitution
3266shouldn't iterate more times than there are characters of input, which
3267is what happened.) See the discussion of substitution in
5f05dabc 3268L<perlop/"Quote and Quote-like Operators">.
a0d0e21e
LW
3269
3270=item Substitution pattern not terminated
3271
3272(F) The lexer couldn't find the interior delimiter of a s/// or s{}{}
3273construct. Remember that bracketing delimiters count nesting level.
fb73857a 3274Missing the leading C<$> from variable C<$s> may cause this error.
a0d0e21e
LW
3275
3276=item Substitution replacement not terminated
3277
3278(F) The lexer couldn't find the final delimiter of a s/// or s{}{}
3279construct. Remember that bracketing delimiters count nesting level.
fb73857a 3280Missing the leading C<$> from variable C<$s> may cause this error.
a0d0e21e
LW
3281
3282=item substr outside of string
3283
be771a83
GS
3284(W substr),(F) You tried to reference a substr() that pointed outside of
3285a string. That is, the absolute value of the offset was larger than the
3286length of the string. See L<perlfunc/substr>. This warning is fatal if
3287substr is used in an lvalue context (as the left hand side of an
3288assignment or as a subroutine argument for example).
a0d0e21e 3289
f86702cc 3290=item suidperl is no longer needed since %s
a0d0e21e 3291
be771a83
GS
3292(F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but
3293a version of the setuid emulator somehow got run anyway.
a0d0e21e 3294
5cd5c422
RB
3295=item Switch (?(condition)... contains too many branches in regex;
3296
3297marked by <-- HERE in m/%s/
b45f050a
JF
3298
3299(F) A (?(condition)if-clause|else-clause) construct can have at most two
3300branches (the if-clause and the else-clause). If you want one or both to
3301contain alternation, such as using C<this|that|other>, enclose it in
3302clustering parentheses:
3303
3304 (?(condition)(?:this|that|other)|else-clause)
3305
7253e4e3 3306The <-- HERE shows in the regular expression about where the problem was
b45f050a
JF
3307discovered. See L<perlre>.
3308
5cd5c422
RB
3309=item Switch condition not recognized in regex;
3310
3311marked by <-- HERE in m/%s/
b45f050a
JF
3312
3313(F) If the argument to the (?(...)if-clause|else-clause) construct is a
7253e4e3 3314number, it can be only a number. The <-- HERE shows in the regular expression
b45f050a
JF
3315about where the problem was discovered. See L<perlre>.
3316
85ab1d1d
JH
3317=item switching effective %s is not implemented
3318
be771a83
GS
3319(F) While under the C<use filetest> pragma, we cannot switch the real
3320and effective uids or gids.
85ab1d1d 3321
a0d0e21e
LW
3322=item syntax error
3323
3324(F) Probably means you had a syntax error. Common reasons include:
3325
3326 A keyword is misspelled.
3327 A semicolon is missing.
3328 A comma is missing.
3329 An opening or closing parenthesis is missing.
3330 An opening or closing brace is missing.
3331 A closing quote is missing.
3332
3333Often there will be another error message associated with the syntax
3334error giving more information. (Sometimes it helps to turn on B<-w>.)
3335The error message itself often tells you where it was in the line when
3336it decided to give up. Sometimes the actual error is several tokens
5f05dabc 3337before this, because Perl is good at understanding random input.
a0d0e21e
LW
3338Occasionally the line number may be misleading, and once in a blue moon
3339the only way to figure out what's triggering the error is to call
3340C<perl -c> repeatedly, chopping away half the program each time to see
be771a83
GS
3341if the error went away. Sort of the cybernetic version of S<20
3342questions>.
a0d0e21e 3343
cb1a09d0
AD
3344=item syntax error at line %d: `%s' unexpected
3345
be771a83
GS
3346(A) You've accidentally run your script through the Bourne shell instead
3347of Perl. Check the #! line, or manually feed your script into Perl
3348yourself.
cb1a09d0 3349
25f58aea
PN
3350=item syntax error in file %s at line %d, next 2 tokens "%s"
3351
3352(F) This error is likely to occur if you run a perl5 script through
3353a perl4 interpreter, especially if the next 2 tokens are "use strict"
3354or "my $var" or "our $var".
3355
6df41af2
GS
3356=item %s syntax OK
3357
3358(F) The final summary message when a C<perl -c> succeeds.
3359
6087ac44 3360=item System V %s is not implemented on this machine
a0d0e21e 3361
6087ac44
JH
3362(F) You tried to do something with a function beginning with "sem",
3363"shm", or "msg" but that System V IPC is not implemented in your
3364machine. In some machines the functionality can exist but be
3365unconfigured. Consult your system support.
a0d0e21e 3366
69282e91 3367=item syswrite() on closed filehandle %s
a0d0e21e