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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).
12 (S) A severe warning (mandatory).
13 (F) A fatal error (trappable).
14 (P) An internal error you should never see (trappable).
15 (X) A very fatal error (non-trappable).
cb1a09d0 16 (A) An alien error message (not generated by Perl).
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18Optional warnings are enabled by using the B<-w> switch. Warnings may
19be captured by setting C<$^Q> to a reference to a routine that will be
20called on each warning instead of printing it. See L<perlvar>.
21Trappable errors may be trapped using the eval operator. See
22L<perlfunc/eval>.
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23
24Some of these messages are generic. Spots that vary are denoted with a %s,
2ba9eb46 25just as in a printf format. Note that some messages start with a %s!
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26The symbols C<"%-?@> sort before the letters, while C<[> and C<\> sort after.
27
28=over 4
29
30=item "my" variable %s can't be in a package
31
32(F) Lexically scoped variables aren't in a package, so it doesn't make sense
33to try to declare one with a package qualifier on the front. Use local()
34if you want to localize a package variable.
35
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36=item "my" variable %s masks earlier declaration in same scope
37
38(S) A lexical variable has been redeclared in the same scope, effectively
39eliminating all access to the previous instance. This is almost always
40a typographical error. Note that the earlier variable will still exist
41until the end of the scope or until all closure referents to it are
42destroyed.
43
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44=item "no" not allowed in expression
45
46(F) The "no" keyword is recognized and executed at compile time, and returns
47no useful value. See L<perlmod>.
48
49=item "use" not allowed in expression
50
51(F) The "use" keyword is recognized and executed at compile time, and returns
52no useful value. See L<perlmod>.
53
54=item % may only be used in unpack
55
56(F) You can't pack a string by supplying a checksum, since the
57checksumming process loses information, and you can't go the other
58way. See L<perlfunc/unpack>.
59
60=item %s (...) interpreted as function
61
62(W) You've run afoul of the rule that says that any list operator followed
63by parentheses turns into a function, with all the list operators arguments
64found inside the parens. See L<perlop/Terms and List Operators (Leftward)>.
65
66=item %s argument is not a HASH element
67
68(F) The argument to delete() or exists() must be a hash element, such as
69
70 $foo{$bar}
71 $ref->[12]->{"susie"}
72
73=item %s did not return a true value
74
75(F) A required (or used) file must return a true value to indicate that
76it compiled correctly and ran its initialization code correctly. It's
77traditional to end such a file with a "1;", though any true value would
78do. See L<perlfunc/require>.
79
80=item %s found where operator expected
81
82(S) The Perl lexer knows whether to expect a term or an operator. If it
83sees what it knows to be a term when it was expecting to see an operator,
84it gives you this warning. Usually it indicates that an operator or
85delimiter was omitted, such as a semicolon.
86
87=item %s had compilation errors.
88
89(F) The final summary message when a C<perl -c> fails.
90
91=item %s has too many errors.
92
93(F) The parser has given up trying to parse the program after 10 errors.
94Further error messages would likely be uninformative.
95
96=item %s matches null string many times
97
98(W) The pattern you've specified would be an infinite loop if the
99regular expression engine didn't specifically check for that. See L<perlre>.
100
101=item %s never introduced
102
103(S) The symbol in question was declared but somehow went out of scope
104before it could possibly have been used.
105
106=item %s syntax OK
107
108(F) The final summary message when a C<perl -c> succeeds.
109
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110=item %s: Command not found.
111
112(A) You've accidentally run your script through B<csh> instead
113of Perl. Check the <#!> line, or manually feed your script
114into Perl yourself.
115
116=item %s: Expression syntax.
117
118(A) You've accidentally run your script through B<csh> instead
119of Perl. Check the <#!> line, or manually feed your script
120into Perl yourself.
121
122=item %s: Undefined variable.
123
124(A) You've accidentally run your script through B<csh> instead
125of Perl. Check the <#!> line, or manually feed your script
126into Perl yourself.
127
128=item %s: not found
129
130(A) You've accidentally run your script through the Bourne shell
131instead of Perl. Check the <#!> line, or manually feed your script
132into Perl yourself.
133
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134=item B<-P> not allowed for setuid/setgid script
135
136(F) The script would have to be opened by the C preprocessor by name,
137which provides a race condition that breaks security.
138
139=item C<-T> and C<-B> not implemented on filehandles
140
141(F) Perl can't peek at the stdio buffer of filehandles when it doesn't
142know about your kind of stdio. You'll have to use a filename instead.
143
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144=item 500 Server error
145
146See Server error.
147
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148=item ?+* follows nothing in regexp
149
150(F) You started a regular expression with a quantifier. Backslash it
151if you meant it literally. See L<perlre>.
152
153=item @ outside of string
154
2ba9eb46 155(F) You had a pack template that specified an absolute position outside
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156the string being unpacked. See L<perlfunc/pack>.
157
158=item accept() on closed fd
159
160(W) You tried to do an accept on a closed socket. Did you forget to check
161the return value of your socket() call? See L<perlfunc/accept>.
162
163=item Allocation too large: %lx
164
165(F) You can't allocate more than 64K on an MSDOS machine.
166
167=item Arg too short for msgsnd
168
169(F) msgsnd() requires a string at least as long as sizeof(long).
170
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171=item Ambiguous use of %s resolved as %s
172
173(W)(S) You said something that may not be interpreted the way
174you thought. Normally it's pretty easy to disambiguate it by supplying
175a missing quote, operator, paren pair or declaration.
176
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177=item Args must match #! line
178
179(F) The setuid emulator requires that the arguments Perl was invoked
180with match the arguments specified on the #! line.
181
182=item Argument "%s" isn't numeric
183
184(W) The indicated string was fed as an argument to an operator that
185expected a numeric value instead. If you're fortunate the message
186will identify which operator was so unfortunate.
187
188=item Array @%s missing the @ in argument %d of %s()
189
190(D) Really old Perl let you omit the @ on array names in some spots. This
191is now heavily deprecated.
192
193=item assertion botched: %s
194
195(P) The malloc package that comes with Perl had an internal failure.
196
197=item Assertion failed: file "%s"
198
199(P) A general assertion failed. The file in question must be examined.
200
201=item Assignment to both a list and a scalar
202
203(F) If you assign to a conditional operator, the 2nd and 3rd arguments
204must either both be scalars or both be lists. Otherwise Perl won't
205know which context to supply to the right side.
206
207=item Attempt to free non-arena SV: 0x%lx
208
209(P) All SV objects are supposed to be allocated from arenas that will
210be garbage collected on exit. An SV was discovered to be outside any
211of those arenas.
212
213=item Attempt to free temp prematurely
214
215(W) Mortalized values are supposed to be freed by the free_tmps()
216routine. This indicates that something else is freeing the SV before
217the free_tmps() routine gets a chance, which means that the free_tmps()
218routine will be freeing an unreferenced scalar when it does try to free
219it.
220
221=item Attempt to free unreferenced glob pointers
222
223(P) The reference counts got screwed up on symbol aliases.
224
225=item Attempt to free unreferenced scalar
226
227(W) Perl went to decrement the reference count of a scalar to see if it
228would go to 0, and discovered that it had already gone to 0 earlier,
229and should have been freed, and in fact, probably was freed. This
230could indicate that SvREFCNT_dec() was called too many times, or that
231SvREFCNT_inc() was called too few times, or that the SV was mortalized
232when it shouldn't have been, or that memory has been corrupted.
233
234=item Bad arg length for %s, is %d, should be %d
235
236(F) You passed a buffer of the wrong size to one of msgctl(), semctl() or
2ba9eb46 237shmctl(). In C parlance, the correct sizes are, respectively,
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238S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)> and
239S<sizeof(struct shmid_ds *)>.
240
241=item Bad associative array
242
243(P) One of the internal hash routines was passed a null HV pointer.
244
245=item Bad filehandle: %s
246
247(F) A symbol was passed to something wanting a filehandle, but the symbol
248has no filehandle associated with it. Perhaps you didn't do an open(), or
249did it in another package.
250
251=item Bad free() ignored
252
253(S) An internal routine called free() on something that had never been
254malloc()ed in the first place.
255
256=item Bad name after %s::
257
258(F) You started to name a symbol by using a package prefix, and then didn't
259finish the symbol. In particular, you can't interpolate outside of quotes,
260so
261
262 $var = 'myvar';
263 $sym = mypack::$var;
264
265is not the same as
266
267 $var = 'myvar';
268 $sym = "mypack::$var";
269
270=item Bad symbol for array
271
272(P) An internal request asked to add an array entry to something that
273wasn't a symbol table entry.
274
275=item Bad symbol for filehandle
276
277(P) An internal request asked to add a filehandle entry to something that
278wasn't a symbol table entry.
279
280=item Bad symbol for hash
281
282(P) An internal request asked to add a hash entry to something that
283wasn't a symbol table entry.
284
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285=item Badly places ()'s
286
287(A) You've accidentally run your script through B<csh> instead
288of Perl. Check the <#!> line, or manually feed your script
289into Perl yourself.
290
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291=item BEGIN failed--compilation aborted
292
293(F) An untrapped exception was raised while executing a BEGIN subroutine.
294Compilation stops immediately and the interpreter is exited.
295
296=item bind() on closed fd
297
298(W) You tried to do a bind on a closed socket. Did you forget to check
299the return value of your socket() call? See L<perlfunc/bind>.
300
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301=item Bizarre copy of %s in %s
302
303(P) Perl detected an attempt to copy an internal value that is not copiable.
304
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305=item Callback called exit
306
307(F) A subroutine invoked from an external package via perl_call_sv()
308exited by calling exit.
309
310=item Can't "last" outside a block
311
312(F) A "last" statement was executed to break out of the current block,
313except that there's this itty bitty problem called there isn't a
314current block. Note that an "if" or "else" block doesn't count as a
315"loopish" block. You can usually double the curlies to get the same
316effect though, since the inner curlies will be considered a block
317that loops once. See L<perlfunc/last>.
318
319=item Can't "next" outside a block
320
321(F) A "next" statement was executed to reiterate the current block, but
322there isn't a current block. Note that an "if" or "else" block doesn't
323count as a "loopish" block. You can usually double the curlies to get
324the same effect though, since the inner curlies will be considered a block
325that loops once. See L<perlfunc/last>.
326
327=item Can't "redo" outside a block
328
329(F) A "redo" statement was executed to restart the current block, but
330there isn't a current block. Note that an "if" or "else" block doesn't
331count as a "loopish" block. You can usually double the curlies to get
332the same effect though, since the inner curlies will be considered a block
333that loops once. See L<perlfunc/last>.
334
335=item Can't bless non-reference value
336
337(F) Only hard references may be blessed. This is how Perl "enforces"
338encapsulation of objects. See L<perlobj>.
339
340=item Can't break at that line
341
342(S) A warning intended for while running within the debugger, indicating
343the line number specified wasn't the location of a statement that could
344be stopped at.
345
346=item Can't call method "%s" in empty package "%s"
347
348(F) You called a method correctly, and it correctly indicated a package
349functioning as a class, but that package doesn't have ANYTHING defined
350in it, let alone methods. See L<perlobj>.
351
352=item Can't call method "%s" on unblessed reference
353
354(F) A method call must know what package it's supposed to run in. It
355ordinarily finds this out from the object reference you supply, but
356you didn't supply an object reference in this case. A reference isn't
357an object reference until it has been blessed. See L<perlobj>.
358
359=item Can't call method "%s" without a package or object reference
360
361(F) You used the syntax of a method call, but the slot filled by the
362object reference or package name contains an expression that returns
363neither an object reference nor a package name. (Perhaps it's null?)
364Something like this will reproduce the error:
365
366 $BADREF = undef;
367 process $BADREF 1,2,3;
368 $BADREF->process(1,2,3);
369
370=item Can't chdir to %s
371
372(F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
373that you can chdir to, possibly because it doesn't exist.
374
375=item Can't coerce %s to integer in %s
376
377(F) Certain types of SVs, in particular real symbol table entries
378(type GLOB), can't be forced to stop being what they are. So you can't
379say things like:
380
381 *foo += 1;
382
383You CAN say
384
385 $foo = *foo;
386 $foo += 1;
387
388but then $foo no longer contains a glob.
389
390=item Can't coerce %s to number in %s
391
392(F) Certain types of SVs, in particular real symbol table entries
393(type GLOB), can't be forced to stop being what they are.
394
395=item Can't coerce %s to string in %s
396
397(F) Certain types of SVs, in particular real symbol table entries
398(type GLOB), can't be forced to stop being what they are.
399
400=item Can't create pipe mailbox
401
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402(P) An error peculiar to VMS. The process is suffering from exhausted quotas
403or other plumbing problems.
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404
405=item Can't declare %s in my
406
407(F) Only scalar, array and hash variables may be declared as lexical variables.
408They must have ordinary identifiers as names.
409
410=item Can't do inplace edit on %s: %s
411
412(S) The creation of the new file failed for the indicated reason.
413
414=item Can't do inplace edit without backup
415
416(F) You're on a system such as MSDOS that gets confused if you try reading
417from a deleted (but still opened) file. You have to say B<-i>C<.bak>, or some
418such.
419
420=item Can't do inplace edit: %s > 14 characters
421
422(S) There isn't enough room in the filename to make a backup name for the file.
423
424=item Can't do inplace edit: %s is not a regular file
425
426(S) You tried to use the B<-i> switch on a special file, such as a file in
427/dev, or a FIFO. The file was ignored.
428
429=item Can't do setegid!
430
431(P) The setegid() call failed for some reason in the setuid emulator
432of suidperl.
433
434=item Can't do seteuid!
435
436(P) The setuid emulator of suidperl failed for some reason.
437
438=item Can't do setuid
439
440(F) This typically means that ordinary perl tried to exec suidperl to
441do setuid emulation, but couldn't exec it. It looks for a name of the
442form sperl5.000 in the same directory that the perl executable resides
443under the name perl5.000, typically /usr/local/bin on Unix machines.
444If the file is there, check the execute permissions. If it isn't, ask
445your sysadmin why he and/or she removed it.
446
447=item Can't do waitpid with flags
448
449(F) This machine doesn't have either waitpid() or wait4(), so only waitpid()
450without flags is emulated.
451
452=item Can't do {n,m} with n > m
453
454(F) Minima must be less than or equal to maxima. If you really want
455your regexp to match something 0 times, just put {0}. See L<perlre>.
456
457=item Can't emulate -%s on #! line
458
459(F) The #! line specifies a switch that doesn't make sense at this point.
460For example, it'd be kind of silly to put a B<-x> on the #! line.
461
462=item Can't exec "%s": %s
463
464(W) An system(), exec() or piped open call could not execute the named
465program for the indicated reason. Typical reasons include: the permissions
466were wrong on the file, the file wasn't found in C<$ENV{PATH}>, the
467executable in question was compiled for another architecture, or the
468#! line in a script points to an interpreter that can't be run for
469similar reasons. (Or maybe your system doesn't support #! at all.)
470
471=item Can't exec %s
472
473(F) Perl was trying to execute the indicated program for you because that's
474what the #! line said. If that's not what you wanted, you may need to
475mention "perl" on the #! line somewhere.
476
477=item Can't execute %s
478
479(F) You used the B<-S> switch, but the script to execute could not be found
480in the PATH, or at least not with the correct permissions.
481
482=item Can't find label %s
483
484(F) You said to goto a label that isn't mentioned anywhere that it's possible
485for us to go to. See L<perlfunc/goto>.
486
487=item Can't find string terminator %s anywhere before EOF
488
489(F) Perl strings can stretch over multiple lines. This message means that
490the closing delimiter was omitted. Since bracketed quotes count nesting
491levels, the following is missing its final parenthesis:
492
493 print q(The character '(' starts a side comment.)
494
495=item Can't fork
496
497(F) A fatal error occurred while trying to fork while opening a pipeline.
498
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499=item Can't get filespec - stale stat buffer?
500
501(S) A warning peculiar to VMS. This arises because of the difference between
502access checks under VMS and under the Unix model Perl assumes. Under VMS,
503access checks are done by filename, rather than by bits in the stat buffer, so
504that ACLs and other protections can be taken into account. Unfortunately, Perl
505assumes that the stat buffer contains all the necessary information, and passes
506it, instead of the filespec, to the access checking routine. It will try to
507retrieve the filespec using the device name and FID present in the stat buffer,
508but this works only if you haven't made a subsequent call to the CRTL stat()
509routine, since the device name is overwritten with each call. If this warning
510appears, the name lookup failed, and the access checking routine gave up and
511returned FALSE, just to be conservative. (Note: The access checking routine
512knows about the Perl C<stat> operator and file tests, so you shouldn't ever
513see this warning in response to a Perl command; it arises only if some internal
514code takes stat buffers lightly.)
515
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516=item Can't get pipe mailbox device name
517
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518(P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl
519can't retrieve its name for later use.
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520
521=item Can't get SYSGEN parameter value for MAXBUF
522
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523(P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
524mailbox buffers to be, and didn't get an answer.
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525
526=item Can't goto subroutine outside a subroutine
527
528(F) The deeply magical "goto subroutine" call can only replace one subroutine
529call for another. It can't manufacture one out of whole cloth. In general
530you should only be calling it out of an AUTOLOAD routine anyway. See
531L<perlfunc/goto>.
532
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533=item Can't localize a reference
534
535(F) You said something like C<local $$ref>, which is not allowed because
536the compiler can't determine whether $ref will end up pointing to anything
537with a symbol table entry, and a symbol table entry is necessary to
538do a local.
539
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540=item Can't localize lexical variable %s
541
2ba9eb46 542(F) You used local on a variable name that was previously declared as a
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543lexical variable using "my". This is not allowed. If you want to
544localize a package variable of the same name, qualify it with the
545package name.
546
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547=item Can't locate %s in @INC
548
549(F) You said to do (or require, or use) a file that couldn't be found
550in any of the libraries mentioned in @INC. Perhaps you need to set
551the PERL5LIB environment variable to say where the extra library is,
552or maybe the script needs to add the library name to @INC. Or maybe
553you just misspelled the name of the file. See L<perlfunc/require>.
554
555=item Can't locate object method "%s" via package "%s"
556
557(F) You called a method correctly, and it correctly indicated a package
558functioning as a class, but that package doesn't define that particular
2ba9eb46 559method, nor does any of its base classes. See L<perlobj>.
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560
561=item Can't locate package %s for @%s::ISA
562
563(W) The @ISA array contained the name of another package that doesn't seem
564to exist.
565
566=item Can't mktemp()
567
568(F) The mktemp() routine failed for some reason while trying to process
569a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
570
571=item Can't modify %s in %s
572
573(F) You aren't allowed to assign to the item indicated, or otherwise try to
574change it, such as with an autoincrement.
575
576=item Can't modify non-existent substring
577
578(P) The internal routine that does assignment to a substr() was handed
579a NULL.
580
581=item Can't msgrcv to readonly var
582
583(F) The target of a msgrcv must be modifiable in order to be used as a receive
584buffer.
585
586=item Can't open %s: %s
587
588(S) An inplace edit couldn't open the original file for the indicated reason.
589Usually this is because you don't have read permission for the file.
590
591=item Can't open bidirectional pipe
592
593(W) You tried to say C<open(CMD, "|cmd|")>, which is not supported. You can
594try any of several modules in the Perl library to do this, such as
595"open2.pl". Alternately, direct the pipe's output to a file using ">",
596and then read it in under a different file handle.
597
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598=item Can't open error file %s as stderr
599
600(F) An error peculiar to VMS. Perl does its own command line redirection, and
601couldn't open the file specified after '2>' or '2>>' on the command line for
602writing.
603
604=item Can't open input file %s as stdin
605
606(F) An error peculiar to VMS. Perl does its own command line redirection, and
607couldn't open the file specified after '<' on the command line for reading.
608
609=item Can't open output file %s as stdout
610
611(F) An error peculiar to VMS. Perl does its own command line redirection, and
612couldn't open the file specified after '>' or '>>' on the command line for
613writing.
614
615=item Can't open output pipe (name: %s)
616
617(P) An error peculiar to VMS. Perl does its own command line redirection, and
618couldn't open the pipe into which to send data destined for stdout.
619
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620=item Can't open perl script "%s": %s
621
622(F) The script you specified can't be opened for the indicated reason.
623
624=item Can't rename %s to %s: %s, skipping file
625
626(S) The rename done by the B<-i> switch failed for some reason, probably because
627you don't have write permission to the directory.
628
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629=item Can't reopen input pipe (name: %s) in binary mode
630
631(P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to
632reopen it to accept binary data. Alas, it failed.
633
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634=item Can't reswap uid and euid
635
636(P) The setreuid() call failed for some reason in the setuid emulator
637of suidperl.
638
639=item Can't return outside a subroutine
640
641(F) The return statement was executed in mainline code, that is, where
642there was no subroutine call to return out of. See L<perlsub>.
643
644=item Can't stat script "%s"
645
646(P) For some reason you can't fstat() the script even though you have
647it open already. Bizarre.
648
649=item Can't swap uid and euid
650
651(P) The setreuid() call failed for some reason in the setuid emulator
652of suidperl.
653
654=item Can't take log of %g
655
656(F) Logarithms are only defined on positive real numbers.
657
658=item Can't take sqrt of %g
659
660(F) For ordinary real numbers, you can't take the square root of a
661negative number. There's a Complex package available for Perl, though,
662if you really want to do that.
663
664=item Can't undef active subroutine
665
666(F) You can't undefine a routine that's currently running. You can,
667however, redefine it while it's running, and you can even undef the
668redefined subroutine while the old routine is running. Go figure.
669
670=item Can't unshift
671
672(F) You tried to unshift an "unreal" array that can't be unshifted, such
673as the main Perl stack.
674
2ba9eb46
PP
675=item Can't untie: %d inner references still exist
676
677(F) With "use strict untie" in effect, a copy of the object returned
678from C<tie> (or C<tied>) was still valid when C<untie> was called.
679
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LW
680=item Can't upgrade that kind of scalar
681
682(P) The internal sv_upgrade routine adds "members" to an SV, making
683it into a more specialized kind of SV. The top several SV types are
684so specialized, however, that they cannot be interconverted. This
685message indicates that such a conversion was attempted.
686
687=item Can't upgrade to undef
688
689(P) The undefined SV is the bottom of the totem pole, in the scheme
690of upgradability. Upgrading to undef indicates an error in the
691code calling sv_upgrade.
692
c07a80fd
PP
693=item Can't use "my %s" in sort comparison
694
695(F) The global variables $a and $b are reserved for sort comparisons.
696You mentioned $a or $b in the same line as the <=> or cmp operator,
697and the variable had earlier been declared as a lexical variable.
698Either qualify the sort variable with the package name, or rename the
699lexical variable.
700
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LW
701=item Can't use %s for loop variable
702
703(F) Only a simple scalar variable may be used as a loop variable on a foreach.
704
705=item Can't use %s ref as %s ref
706
707(F) You've mixed up your reference types. You have to dereference a
708reference of the type needed. You can use the ref() function to
709test the type of the reference, if need be.
710
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711=item Can't use \1 to mean $1 in expression
712
713(W) In an ordinary expression, backslash is a unary operator that creates
714a reference to its argument. The use of backslash to indicate a backreference
715to a matched substring is only valid as part of a regular expression pattern.
716Trying to do this in ordinary Perl code produces a value that prints
717out looking like SCALAR(0xdecaf). Use the $1 form instead.
718
719=item Can't use string ("%s") as %s ref while "strict refs" in use
a0d0e21e
LW
720
721(F) Only hard references are allowed by "strict refs". Symbolic references
722are disallowed. See L<perlref>.
723
724=item Can't use an undefined value as %s reference
725
726(F) A value used as either a hard reference or a symbolic reference must
727be a defined value. This helps to de-lurk some insidious errors.
728
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LW
729=item Can't use global %s in "my"
730
731(F) You tried to declare a magical variable as a lexical variable. This is
732not allowed, because the magic can only be tied to one location (namely
733the global variable) and it would be incredibly confusing to have
734variables in your program that looked like magical variables but
735weren't.
736
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737=item Can't use subscript on %s
738
739(F) The compiler tried to interpret a bracketed expression as a
740subscript. But to the left of the brackets was an expression that
741didn't look like an array reference, or anything else subscriptable.
742
a0d0e21e
LW
743=item Can't write to temp file for B<-e>: %s
744
745(F) The write routine failed for some reason while trying to process
746a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
747
748=item Can't x= to readonly value
749
750(F) You tried to repeat a constant value (often the undefined value) with
751an assignment operator, which implies modifying the value itself.
752Perhaps you need to copy the value to a temporary, and repeat that.
753
754=item Cannot open temporary file
755
756(F) The create routine failed for some reaon while trying to process
757a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
758
759=item chmod: mode argument is missing initial 0
760
761(W) A novice will sometimes say
762
763 chmod 777, $filename
764
765not realizing that 777 will be interpreted as a decimal number, equivalent
766to 01411. Octal constants are introduced with a leading 0 in Perl, as in C.
767
768=item Close on unopened file <%s>
769
770(W) You tried to close a filehandle that was never opened.
771
772=item connect() on closed fd
773
774(W) You tried to do a connect on a closed socket. Did you forget to check
775the return value of your socket() call? See L<perlfunc/connect>.
776
777=item Corrupt malloc ptr 0x%lx at 0x%lx
778
779(P) The malloc package that comes with Perl had an internal failure.
780
781=item corrupted regexp pointers
782
783(P) The regular expression engine got confused by what the regular
784expression compiler gave it.
785
786=item corrupted regexp program
787
788(P) The regular expression engine got passed a regexp program without
789a valid magic number.
790
791=item Deep recursion on subroutine "%s"
792
793(W) This subroutine has called itself (directly or indirectly) 100
794times than it has returned. This probably indicates an infinite
795recursion, unless you're writing strange benchmark programs, in which
796case it indicates something else.
797
4633a7c4
LW
798=item Did you mean &%s instead?
799
800(W) You probably referred to an imported subroutine &FOO as $FOO or some such.
801
748a9306 802=item Did you mean $ or @ instead of %?
a0d0e21e 803
748a9306
LW
804(W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}.
805On the other hand, maybe you just meant %hash and got carried away.
806
807=item Do you need to predeclare %s?
808
809(S) This is an educated guess made in conjunction with the message "%s
810found where operator expected". It often means a subroutine or module
811name is being referenced that hasn't been declared yet. This may be
812because of ordering problems in your file, or because of a missing
813"sub", "package", "require", or "use" statement. If you're
814referencing something that isn't defined yet, you don't actually have
815to define the subroutine or package before the current location. You
816can use an empty "sub foo;" or "package FOO;" to enter a "forward"
817declaration.
a0d0e21e
LW
818
819=item Don't know how to handle magic of type '%s'
820
821(P) The internal handling of magical variables has been cursed.
822
823=item do_study: out of memory
824
825(P) This should have been caught by safemalloc() instead.
826
827=item Duplicate free() ignored
828
829(S) An internal routine called free() on something that had already
830been freed.
831
4633a7c4
LW
832=item elseif should be elsif
833
834(S) There is no keyword "elseif" in Perl because Larry thinks it's
835ugly. Your code will be interpreted as an attempt to call a method
836named "elseif" for the class returned by the following block. This is
837unlikely to be what you want.
838
a0d0e21e
LW
839=item END failed--cleanup aborted
840
841(F) An untrapped exception was raised while executing an END subroutine.
842The interpreter is immediately exited.
843
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LW
844=item Error converting file specification %s
845
846(F) An error peculiar to VMS. Since Perl may have to deal with file
847specifications in either VMS or Unix syntax, it converts them to a
848single form when it must operate on them directly. Either you've
849passed an invalid file specification to Perl, or you've found a
850case the conversion routines don't handle. Drat.
851
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LW
852=item Execution of %s aborted due to compilation errors.
853
854(F) The final summary message when a Perl compilation fails.
855
856=item Exiting eval via %s
857
858(W) You are exiting an eval by unconventional means, such as a
859a goto, or a loop control statement.
860
861=item Exiting subroutine via %s
862
863(W) You are exiting a subroutine by unconventional means, such as a
864a goto, or a loop control statement.
865
866=item Exiting substitution via %s
867
868(W) You are exiting a substitution by unconventional means, such as a
869a return, a goto, or a loop control statement.
870
748a9306 871=item Fatal VMS error at %s, line %d
a0d0e21e 872
748a9306
LW
873(P) An error peculiar to VMS. Something untoward happened in a VMS system
874service or RTL routine; Perl's exit status should provide more details. The
875filename in "at %s" and the line number in "line %d" tell you which section of
876the Perl source code is distressed.
a0d0e21e
LW
877
878=item fcntl is not implemented
879
880(F) Your machine apparently doesn't implement fcntl(). What is this, a
881PDP-11 or something?
882
883=item Filehandle %s never opened
884
885(W) An I/O operation was attempted on a filehandle that was never initialized.
886You need to do an open() or a socket() call, or call a constructor from
887the FileHandle package.
888
889=item Filehandle %s opened only for input
890
891(W) You tried to write on a read-only filehandle. If you
892intended it to be a read-write filehandle, you needed to open it with
893"+<" or "+>" or "+>>" instead of with "<" or nothing. If you only
894intended to write the file, use ">" or ">>". See L<perlfunc/open>.
895
896=item Filehandle only opened for input
897
898(W) You tried to write on a read-only filehandle. If you
899intended it to be a read-write filehandle, you needed to open it with
900"+<" or "+>" or "+>>" instead of with "<" or nothing. If you only
901intended to write the file, use ">" or ">>". See L<perlfunc/open>.
902
903=item Final $ should be \$ or $name
904
905(F) You must now decide whether the final $ in a string was meant to be
906a literal dollar sign, or was meant to introduce a variable name
907that happens to be missing. So you have to put either the backslash or
908the name.
909
910=item Final @ should be \@ or @name
911
912(F) You must now decide whether the final @ in a string was meant to be
913a literal "at" sign, or was meant to introduce a variable name
914that happens to be missing. So you have to put either the backslash or
915the name.
916
917=item Format %s redefined
918
919(W) You redefined a format. To suppress this warning, say
920
921 {
922 local $^W = 0;
923 eval "format NAME =...";
924 }
925
926=item Format not terminated
927
928(F) A format must be terminated by a line with a solitary dot. Perl got
929to the end of your file without finding such a line.
930
931=item Found = in conditional, should be ==
932
933(W) You said
934
935 if ($foo = 123)
936
937when you meant
938
939 if ($foo == 123)
940
941(or something like that).
942
943=item gdbm store returned %d, errno %d, key "%s"
944
945(S) A warning from the GDBM_File extension that a store failed.
946
947=item gethostent not implemented
948
949(F) Your C library apparently doesn't implement gethostent(), probably
950because if it did, it'd feel morally obligated to return every hostname
951on the Internet.
952
953=item get{sock,peer}name() on closed fd
954
955(W) You tried to get a socket or peer socket name on a closed socket.
956Did you forget to check the return value of your socket() call?
957
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LW
958=item getpwnam returned invalid UIC %#o for user "%s"
959
960(S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
961C<getpwnam> operator returned an invalid UIC.
962
963
a0d0e21e
LW
964=item Glob not terminated
965
966(F) The lexer saw a left angle bracket in a place where it was expecting
967a term, so it's looking for the corresponding right angle bracket, and not
968finding it. Chances are you left some needed parentheses out earlier in
969the line, and you really meant a "less than".
970
971=item Global symbol "%s" requires explicit package name
972
973(F) You've said "use strict vars", which indicates that all variables must
974either be lexically scoped (using "my"), or explicitly qualified to
975say which package the global variable is in (using "::").
976
977=item goto must have label
978
979(F) Unlike with "next" or "last", you're not allowed to goto an
980unspecified destination. See L<perlfunc/goto>.
981
982=item Had to create %s unexpectedly
983
984(S) A routine asked for a symbol from a symbol table that ought to have
985existed already, but for some reason it didn't, and had to be created on
986an emergency basis to prevent a core dump.
987
988=item Hash %%s missing the % in argument %d of %s()
989
990(D) Really old Perl let you omit the % on hash names in some spots. This
991is now heavily deprecated.
992
2ba9eb46 993=item Name "%s::%s" used only once: possible typo
a0d0e21e 994
2ba9eb46
PP
995(W) Typographical errors often show up as unique variable names. If you
996had a good reason for having a unique name, then just mention it
997again somehow to suppress the message (the C<use vars> pragma is
998provided for just this purpose).
a0d0e21e
LW
999
1000=item Illegal division by zero
1001
1002(F) You tried to divide a number by 0. Either something was wrong in your
1003logic, or you need to put a conditional in to guard against meaningless input.
1004
1005=item Illegal modulus zero
1006
1007(F) You tried to divide a number by 0 to get the remainder. Most numbers
1008don't take to this kindly.
1009
1010=item Illegal octal digit
1011
1012(F) You used an 8 or 9 in a octal number.
1013
748a9306
LW
1014=item Illegal octal digit ignored
1015
1016(W) You may have tried to use an 8 or 9 in a octal number. Interpretation
1017of the octal number stopped before the 8 or 9.
1018
a0d0e21e
LW
1019=item Insecure dependency in %s
1020
1021(F) You tried to do something that the tainting mechanism didn't like.
1022The tainting mechanism is turned on when you're running setuid or setgid,
1023or when you specify B<-T> to turn it on explicitly. The tainting mechanism
1024labels all data that's derived directly or indirectly from the user,
1025who is considered to be unworthy of your trust. If any such data is
1026used in a "dangerous" operation, you get this error. See L<perlsec>
1027for more information.
1028
1029=item Insecure directory in %s
1030
1031(F) You can't use system(), exec(), or a piped open in a setuid or setgid
1032script if $ENV{PATH} contains a directory that is writable by the world.
1033See L<perlsec>.
1034
1035=item Insecure PATH
1036
1037(F) You can't use system(), exec(), or a piped open in a setuid or
1038setgid script if $ENV{PATH} is derived from data supplied (or
1039potentially supplied) by the user. The script must set the path to a
1040known value, using trustworthy data. See L<perlsec>.
1041
748a9306
LW
1042=item Internal inconsistency in tracking vforks
1043
1044(S) A warning peculiar to VMS. Perl keeps track of the number
1045of times you've called C<fork> and C<exec>, in order to determine
2ba9eb46 1046whether the current call to C<exec> should affect the current
748a9306
LW
1047script or a subprocess (see L<perlvms/exec>). Somehow, this count
1048has become scrambled, so Perl is making a guess and treating
1049this C<exec> as a request to terminate the Perl script
1050and execute the specified command.
1051
a0d0e21e
LW
1052=item internal disaster in regexp
1053
1054(P) Something went badly wrong in the regular expression parser.
1055
1056=item internal urp in regexp at /%s/
1057
1058(P) Something went badly awry in the regular expression parser.
1059
1060=item invalid [] range in regexp
1061
1062(F) The range specified in a character class had a minimum character
1063greater than the maximum character. See L<perlre>.
1064
1065=item ioctl is not implemented
1066
1067(F) Your machine apparently doesn't implement ioctl(), which is pretty
1068strange for a machine that supports C.
1069
1070=item junk on end of regexp
1071
1072(P) The regular expression parser is confused.
1073
1074=item Label not found for "last %s"
1075
1076(F) You named a loop to break out of, but you're not currently in a
1077loop of that name, not even if you count where you were called from.
1078See L<perlfunc/last>.
1079
1080=item Label not found for "next %s"
1081
1082(F) You named a loop to continue, but you're not currently in a loop of
1083that name, not even if you count where you were called from. See
1084L<perlfunc/last>.
1085
1086=item Label not found for "redo %s"
1087
1088(F) You named a loop to restart, but you're not currently in a loop of
1089that name, not even if you count where you were called from. See
1090L<perlfunc/last>.
1091
1092=item listen() on closed fd
1093
1094(W) You tried to do a listen on a closed socket. Did you forget to check
1095the return value of your socket() call? See L<perlfunc/listen>.
1096
1097=item Literal @%s now requires backslash
1098
1099(F) It used to be that Perl would try to guess whether you wanted an
1100array interpolated or a literal @. It did this when the string was
1101first used at runtime. Now strings are parsed at compile time, and
1102ambiguous instances of @ must be disambiguated, either by putting a
1103backslash to indicate a literal, or by declaring (or using) the array
1104within the program before the string (lexically). (Someday it will simply
1105assume that an unbackslashed @ interpolates an array.)
1106
1107=item Method for operation %s not found in package %s during blessing
1108
1109(F) An attempt was made to specify an entry in an overloading table that
1110doesn't somehow point to a valid method. See L<perlovl>.
1111
1112=item Might be a runaway multi-line %s string starting on line %d
1113
1114(S) An advisory indicating that the previous error may have been caused
1115by a missing delimiter on a string or pattern, because it eventually
1116ended earlier on the current line.
1117
1118=item Misplaced _ in number
1119
1120(W) An underline in a decimal constant wasn't on a 3-digit boundary.
1121
1122=item Missing $ on loop variable
1123
1124(F) Apparently you've been programming in csh too much. Variables are always
1125mentioned with the $ in Perl, unlike in the shells, where it can vary from
1126one line to the next.
1127
1128=item Missing comma after first argument to %s function
1129
1130(F) While certain functions allow you to specify a filehandle or an
1131"indirect object" before the argument list, this ain't one of them.
1132
748a9306
LW
1133=item Missing operator before %s?
1134
1135(S) This is an educated guess made in conjunction with the message "%s
1136found where operator expected". Often the missing operator is a comma.
1137
a0d0e21e
LW
1138=item Missing right bracket
1139
1140(F) The lexer counted more opening curly brackets (braces) than closing ones.
1141As a general rule, you'll find it's missing near the place you were last
1142editing.
1143
1144=item Missing semicolon on previous line?
1145
1146(S) This is an educated guess made in conjunction with the message "%s
1147found where operator expected". Don't automatically put a semicolon on
1148the previous line just because you saw this message.
1149
1150=item Modification of a read-only value attempted
1151
1152(F) You tried, directly or indirectly, to change the value of a
1153constant. You didn't, of course, try "2 = 1", since the compiler
1154catches that. But an easy way to do the same thing is:
1155
1156 sub mod { $_[0] = 1 }
1157 mod(2);
1158
1159Another way is to assign to a substr() that's off the end of the string.
1160
1161=item Modification of non-creatable array value attempted, subscript %d
1162
1163(F) You tried to make an array value spring into existence, and the
1164subscript was probably negative, even counting from end of the array
1165backwards.
1166
1167=item Modification of non-creatable hash value attempted, subscript "%s"
1168
1169(F) You tried to make a hash value spring into existence, and it couldn't
1170be created for some peculiar reason.
1171
1172=item Module name must be constant
1173
1174(F) Only a bare module name is allowed as the first argument to a "use".
1175
1176=item msg%s not implemented
1177
1178(F) You don't have System V message IPC on your system.
1179
1180=item Multidimensional syntax %s not supported
1181
1182(W) Multidimensional arrays aren't written like $foo[1,2,3]. They're written
1183like $foo[1][2][3], as in C.
1184
1185=item Negative length
1186
1187(F) You tried to do a read/write/send/recv operation with a buffer length
1188that is less than 0. This is difficult to imagine.
1189
1190=item nested *?+ in regexp
1191
1192(F) You can't quantify a quantifier without intervening parens. So
1193things like ** or +* or ?* are illegal.
1194
1195Note, however, that the minimal matching quantifiers, *?, +? and ?? appear
1196to be nested quantifiers, but aren't. See L<perlre>.
1197
1198=item No #! line
1199
1200(F) The setuid emulator requires that scripts have a well-formed #! line
1201even on machines that don't support the #! construct.
1202
1203=item No %s allowed while running setuid
1204
1205(F) Certain operations are deemed to be too insecure for a setuid or setgid
1206script to even be allowed to attempt. Generally speaking there will be
1207another way to do what you want that is, if not secure, at least securable.
1208See L<perlsec>.
1209
1210=item No B<-e> allowed in setuid scripts
1211
1212(F) A setuid script can't be specified by the user.
1213
1214=item No comma allowed after %s
1215
1216(F) A list operator that has a filehandle or "indirect object" is not
1217allowed to have a comma between that and the following arguments.
1218Otherwise it'd be just another one of the arguments.
1219
748a9306
LW
1220=item No command into which to pipe on command line
1221
1222(F) An error peculiar to VMS. Perl handles its own command line redirection,
1223and found a '|' at the end of the command line, so it doesn't know whither you
1224want to pipe the output from this command.
1225
a0d0e21e
LW
1226=item No DB::DB routine defined
1227
1228(F) The currently executing code was compiled with the B<-d> switch,
1229but for some reason the perl5db.pl file (or some facsimile thereof)
1230didn't define a routine to be called at the beginning of each
1231statement. Which is odd, because the file should have been required
1232automatically, and should have blown up the require if it didn't parse
1233right.
1234
1235=item No dbm on this machine
1236
1237(P) This is counted as an internal error, because every machine should
1238supply dbm nowadays, since Perl comes with SDBM. See L<SDBM_File>.
1239
1240=item No DBsub routine
1241
1242(F) The currently executing code was compiled with the B<-d> switch,
1243but for some reason the perl5db.pl file (or some facsimile thereof)
1244didn't define a DB::sub routine to be called at the beginning of each
1245ordinary subroutine call.
1246
748a9306
LW
1247=item No error file after 2> or 2>> on command line
1248
1249(F) An error peculiar to VMS. Perl handles its own command line redirection,
1250and found a '2>' or a '2>>' on the command line, but can't find the name of the
1251file to which to write data destined for stderr.
1252
1253=item No input file after < on command line
1254
1255(F) An error peculiar to VMS. Perl handles its own command line redirection,
1256and found a '<' on the command line, but can't find the name of the file from
1257which to read data for stdin.
1258
1259=item No output file after > on command line
1260
1261(F) An error peculiar to VMS. Perl handles its own command line redirection,
1262and found a lone '>' at the end of the command line, so it doesn't know whither
1263you wanted to redirect stdout.
1264
1265=item No output file after > or >> on command line
1266
1267(F) An error peculiar to VMS. Perl handles its own command line redirection,
1268and found a '>' or a '>>' on the command line, but can't find the name of the
1269file to which to write data destined for stdout.
1270
a0d0e21e
LW
1271=item No Perl script found in input
1272
1273(F) You called C<perl -x>, but no line was found in the file beginning
1274with #! and containing the word "perl".
1275
1276=item No setregid available
1277
1278(F) Configure didn't find anything resembling the setregid() call for
1279your system.
1280
1281=item No setreuid available
1282
1283(F) Configure didn't find anything resembling the setreuid() call for
1284your system.
1285
1286=item No space allowed after B<-I>
1287
1288(F) The argument to B<-I> must follow the B<-I> immediately with no
1289intervening space.
1290
748a9306
LW
1291=item No such pipe open
1292
1293(P) An error peculiar to VMS. The internal routine my_pclose() tried to
1294close a pipe which hadn't been opened. This should have been caught earlier as
1295an attempt to close an unopened filehandle.
1296
a0d0e21e
LW
1297=item No such signal: SIG%s
1298
1299(W) You specified a signal name as a subscript to %SIG that was not recognized.
1300Say C<kill -l> in your shell to see the valid signal names on your system.
1301
1302=item Not a CODE reference
1303
1304(F) Perl was trying to evaluate a reference to a code value (that is, a
1305subroutine), but found a reference to something else instead. You can
1306use the ref() function to find out what kind of ref it really was.
1307See also L<perlref>.
1308
1309=item Not a format reference
1310
1311(F) I'm not sure how you managed to generate a reference to an anonymous
1312format, but this indicates you did, and that it didn't exist.
1313
1314=item Not a GLOB reference
1315
1316(F) Perl was trying to evaluate a reference to a "type glob" (that is,
1317a symbol table entry that looks like C<*foo>), but found a reference to
1318something else instead. You can use the ref() function to find out
1319what kind of ref it really was. See L<perlref>.
1320
1321=item Not a HASH reference
1322
1323(F) Perl was trying to evaluate a reference to a hash value, but
1324found a reference to something else instead. You can use the ref()
1325function to find out what kind of ref it really was. See L<perlref>.
1326
1327=item Not a perl script
1328
1329(F) The setuid emulator requires that scripts have a well-formed #! line
1330even on machines that don't support the #! construct. The line must
1331mention perl.
1332
1333=item Not a SCALAR reference
1334
1335(F) Perl was trying to evaluate a reference to a scalar value, but
1336found a reference to something else instead. You can use the ref()
1337function to find out what kind of ref it really was. See L<perlref>.
1338
1339=item Not a subroutine reference
1340
1341(F) Perl was trying to evaluate a reference to a code value (that is, a
1342subroutine), but found a reference to something else instead. You can
1343use the ref() function to find out what kind of ref it really was.
1344See also L<perlref>.
1345
1346=item Not a subroutine reference in %OVERLOAD
1347
1348(F) An attempt was made to specify an entry in an overloading table that
1349doesn't somehow point to a valid subroutine. See L<perlovl>.
1350
1351=item Not an ARRAY reference
1352
1353(F) Perl was trying to evaluate a reference to an array value, but
1354found a reference to something else instead. You can use the ref()
1355function to find out what kind of ref it really was. See L<perlref>.
1356
1357=item Not enough arguments for %s
1358
1359(F) The function requires more arguments than you specified.
1360
1361=item Not enough format arguments
1362
1363(W) A format specified more picture fields than the next line supplied.
1364See L<perlform>.
1365
1366=item Null filename used
1367
1368(F) You can't require the null filename, especially since on many machines
1369that means the current directory! See L<perlfunc/require>.
1370
1371=item NULL OP IN RUN
1372
1373(P) Some internal routine called run() with a null opcode pointer.
1374
1375=item Null realloc
1376
1377(P) An attempt was made to realloc NULL.
1378
1379=item NULL regexp argument
1380
1381(P) The internal pattern matching routines blew it bigtime.
1382
1383=item NULL regexp parameter
1384
1385(P) The internal pattern matching routines are out of their gourd.
1386
1387=item Odd number of elements in hash list
1388
1389(S) You specified an odd number of elements to a hash list, which is odd,
1390since hash lists come in key/value pairs.
1391
1392=item oops: oopsAV
1393
1394(S) An internal warning that the grammar is screwed up.
1395
1396=item oops: oopsHV
1397
1398(S) An internal warning that the grammar is screwed up.
1399
1400=item Operation `%s' %s: no method found,
1401
1402(F) An attempt was made to use an entry in an overloading table that
1403somehow no longer points to a valid method. See L<perlovl>.
1404
748a9306
LW
1405=item Operator or semicolon missing before %s
1406
1407(S) You used a variable or subroutine call where the parser was
1408expecting an operator. The parser has assumed you really meant
1409to use an operator, but this is highly likely to be incorrect.
1410For example, if you say "*foo *foo" it will be interpreted as
1411if you said "*foo * 'foo'".
1412
a0d0e21e
LW
1413=item Out of memory for yacc stack
1414
1415(F) The yacc parser wanted to grow its stack so it could continue parsing,
1416but realloc() wouldn't give it more memory, virtual or otherwise.
1417
1418=item Out of memory!
1419
1420(X) The malloc() function returned 0, indicating there was insufficient
1421remaining memory (or virtual memory) to satisfy the request.
1422
1423=item page overflow
1424
1425(W) A single call to write() produced more lines than can fit on a page.
1426See L<perlform>.
1427
1428=item panic: ck_grep
1429
1430(P) Failed an internal consistency check trying to compile a grep.
1431
1432=item panic: ck_split
1433
1434(P) Failed an internal consistency check trying to compile a split.
1435
1436=item panic: corrupt saved stack index
1437
1438(P) The savestack was requested to restore more localized values than there
1439are in the savestack.
1440
1441=item panic: die %s
1442
1443(P) We popped the context stack to an eval context, and then discovered
1444it wasn't an eval context.
1445
1446=item panic: do_match
1447
1448(P) The internal pp_match() routine was called with invalid operational data.
1449
1450=item panic: do_split
1451
1452(P) Something terrible went wrong in setting up for the split.
1453
1454=item panic: do_subst
1455
1456(P) The internal pp_subst() routine was called with invalid operational data.
1457
1458=item panic: do_trans
1459
1460(P) The internal do_trans() routine was called with invalid operational data.
1461
1462=item panic: goto
1463
1464(P) We popped the context stack to a context with the specified label,
1465and then discovered it wasn't a context we know how to do a goto in.
1466
1467=item panic: INTERPCASEMOD
1468
1469(P) The lexer got into a bad state at a case modifier.
1470
1471=item panic: INTERPCONCAT
1472
1473(P) The lexer got into a bad state parsing a string with brackets.
1474
1475=item panic: last
1476
1477(P) We popped the context stack to a block context, and then discovered
1478it wasn't a block context.
1479
1480=item panic: leave_scope clearsv
1481
1482(P) A writable lexical variable became readonly somehow within the scope.
1483
1484=item panic: leave_scope inconsistency
1485
1486(P) The savestack probably got out of sync. At least, there was an
1487invalid enum on the top of it.
1488
1489=item panic: malloc
1490
1491(P) Something requested a negative number of bytes of malloc.
1492
1493=item panic: mapstart
1494
1495(P) The compiler is screwed up with respect to the map() function.
1496
1497=item panic: null array
1498
1499(P) One of the internal array routines was passed a null AV pointer.
1500
1501=item panic: pad_alloc
1502
1503(P) The compiler got confused about which scratch pad it was allocating
1504and freeing temporaries and lexicals from.
1505
1506=item panic: pad_free curpad
1507
1508(P) The compiler got confused about which scratch pad it was allocating
1509and freeing temporaries and lexicals from.
1510
1511=item panic: pad_free po
1512
1513(P) An invalid scratch pad offset was detected internally.
1514
1515=item panic: pad_reset curpad
1516
1517(P) The compiler got confused about which scratch pad it was allocating
1518and freeing temporaries and lexicals from.
1519
1520=item panic: pad_sv po
1521
1522(P) An invalid scratch pad offset was detected internally.
1523
1524=item panic: pad_swipe curpad
1525
1526(P) The compiler got confused about which scratch pad it was allocating
1527and freeing temporaries and lexicals from.
1528
1529=item panic: pad_swipe po
1530
1531(P) An invalid scratch pad offset was detected internally.
1532
1533=item panic: pp_iter
1534
1535(P) The foreach iterator got called in a non-loop context frame.
1536
1537=item panic: realloc
1538
1539(P) Something requested a negative number of bytes of realloc.
1540
1541=item panic: restartop
1542
1543(P) Some internal routine requested a goto (or something like it), and
1544didn't supply the destination.
1545
1546=item panic: return
1547
1548(P) We popped the context stack to a subroutine or eval context, and
1549then discovered it wasn't a subroutine or eval context.
1550
1551=item panic: scan_num
1552
1553(P) scan_num() got called on something that wasn't a number.
1554
1555=item panic: sv_insert
1556
1557(P) The sv_insert() routine was told to remove more string than there
1558was string.
1559
1560=item panic: top_env
1561
1562(P) The compiler attempted to do a goto, or something weird like that.
1563
1564=item panic: yylex
1565
1566(P) The lexer got into a bad state while processing a case modifier.
1567
1568=item Parens missing around "%s" list
1569
1570(W) You said something like
1571
1572 my $foo, $bar = @_;
1573
1574when you meant
1575
1576 my ($foo, $bar) = @_;
1577
1578Remember that "my" and "local" bind closer than comma.
1579
1580=item Perl %3.3f required--this is only version %s, stopped
1581
1582(F) The module in question uses features of a version of Perl more recent
1583than the currently running version. How long has it been since you upgraded,
1584anyway? See L<perlfunc/require>.
1585
1586=item Permission denied
1587
1588(F) The setuid emulator in suidperl decided you were up to no good.
1589
748a9306
LW
1590=item pid %d not a child
1591
1592(W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which
1593isn't a subprocess of the current process. While this is fine from VMS'
1594perspective, it's probably not what you intended.
1595
a0d0e21e
LW
1596=item POSIX getpgrp can't take an argument
1597
1598(F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike
1599the BSD version, which takes a pid.
1600
1601=item Possible memory corruption: %s overflowed 3rd argument
1602
1603(F) An ioctl() or fcntl() returned more than Perl was bargaining for.
1604Perl guesses a reasonable buffer size, but puts a sentinel byte at the
1605end of the buffer just in case. This sentinel byte got clobbered, and
1606Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
1607
1608=item Precedence problem: open %s should be open(%s)
1609
1610(S) The old irregular construct
cb1a09d0 1611
a0d0e21e
LW
1612 open FOO || die;
1613
1614is now misinterpreted as
1615
1616 open(FOO || die);
1617
1618because of the strict regularization of Perl 5's grammar into unary and
1619list operators. (The old open was a little of both.) You must put
1620parens around the filehandle, or use the new "or" operator instead of "||".
1621
1622=item print on closed filehandle %s
1623
1624(W) The filehandle you're printing on got itself closed sometime before now.
1625Check your logic flow.
1626
1627=item printf on closed filehandle %s
1628
1629(W) The filehandle you're writing to got itself closed sometime before now.
1630Check your logic flow.
1631
1632=item Probable precedence problem on %s
1633
1634(W) The compiler found a bare word where it expected a conditional,
1635which often indicates that an || or && was parsed as part of the
1636last argument of the previous construct, for example:
1637
1638 open FOO || die;
1639
4633a7c4
LW
1640=item Prototype mismatch: (%s) vs (%s)
1641
1642(S) The subroutine being defined had a predeclared (forward) declaration
1643with a different function prototype.
1644
a0d0e21e
LW
1645=item Read on closed filehandle <%s>
1646
1647(W) The filehandle you're reading from got itself closed sometime before now.
1648Check your logic flow.
1649
1650=item Reallocation too large: %lx
1651
1652(F) You can't allocate more than 64K on an MSDOS machine.
1653
1654=item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
1655
1656(F) You can't use the B<-D> option unless the code to produce the
1657desired output is compiled into Perl, which entails some overhead,
1658which is why it's currently left out of your copy.
1659
1660=item Recursive inheritance detected
1661
1662(F) More than 100 levels of inheritance were used. Probably indicates
1663an unintended loop in your inheritance hierarchy.
1664
1665=item Reference miscount in sv_replace()
1666
1667(W) The internal sv_replace() function was handed a new SV with a
1668reference count of other than 1.
1669
1670=item regexp memory corruption
1671
1672(P) The regular expression engine got confused by what the regular
1673expression compiler gave it.
1674
1675=item regexp out of space
1676
1677(P) A "can't happen" error, because safemalloc() should have caught it earlier.
1678
1679=item regexp too big
1680
2ba9eb46 1681(F) The current implementation of regular expressions uses shorts as
a0d0e21e
LW
1682address offsets within a string. Unfortunately this means that if
1683the regular expression compiles to longer than 32767, it'll blow up.
1684Usually when you want a regular expression this big, there is a better
1685way to do it with multiple statements. See L<perlre>.
1686
1687=item Reversed %s= operator
1688
1689(W) You wrote your assignment operator backwards. The = must always
1690comes last, to avoid ambiguity with subsequent unary operators.
1691
1692=item Runaway format
1693
1694(F) Your format contained the ~~ repeat-until-blank sequence, but it
1695produced 200 lines at once, and the 200th line looked exactly like the
1696199th line. Apparently you didn't arrange for the arguments to exhaust
1697themselves, either by using ^ instead of @ (for scalar variables), or by
1698shifting or popping (for array variables). See L<perlform>.
1699
1700=item Scalar value @%s[%s] better written as $%s[%s]
1701
1702(W) You've used an array slice (indicated by @) to select a single value of
1703an array. Generally it's better to ask for a scalar value (indicated by $).
1704The difference is that $foo[&bar] always behaves like a scalar, both when
1705assigning to it and when evaluating its argument, while @foo[&bar] behaves
1706like a list when you assign to it, and provides a list context to its
1707subscript, which can do weird things if you're only expecting one subscript.
1708
748a9306
LW
1709On the other hand, if you were actually hoping to treat the array
1710element as a list, you need to look into how references work, since
1711Perl will not magically convert between scalars and lists for you. See
1712L<perlref>.
1713
a0d0e21e
LW
1714=item Script is not setuid/setgid in suidperl
1715
1716(F) Oddly, the suidperl program was invoked on a script with its setuid
1717or setgid bit set. This doesn't make much sense.
1718
1719=item Search pattern not terminated
1720
1721(F) The lexer couldn't find the final delimiter of a // or m{}
1722construct. Remember that bracketing delimiters count nesting level.
1723
1724=item seek() on unopened file
1725
1726(W) You tried to use the seek() function on a filehandle that was either
1727never opened or has been closed since.
1728
1729=item select not implemented
1730
1731(F) This machine doesn't implement the select() system call.
1732
1733=item sem%s not implemented
1734
1735(F) You don't have System V semaphore IPC on your system.
1736
1737=item semi-panic: attempt to dup freed string
1738
1739(S) The internal newSVsv() routine was called to duplicate a scalar
1740that had previously been marked as free.
1741
1742=item Semicolon seems to be missing
1743
1744(W) A nearby syntax error was probably caused by a missing semicolon,
1745or possibly some other missing operator, such as a comma.
1746
1747=item Send on closed socket
1748
1749(W) The filehandle you're sending to got itself closed sometime before now.
1750Check your logic flow.
1751
1752=item Sequence (?#... not terminated
1753
1754(F) A regular expression comment must be terminated by a closing
1755parenthesis. Embedded parens aren't allowed. See L<perlre>.
1756
1757=item Sequence (?%s...) not implemented
1758
1759(F) A proposed regular expression extension has the character reserved
1760but has not yet been written. See L<perlre>.
1761
1762=item Sequence (?%s...) not recognized
1763
1764(F) You used a regular expression extension that doesn't make sense.
1765See L<perlre>.
1766
a5f75d66
AD
1767=item Server error
1768
1769Also known as "500 Server error". This is a CGI error, not a Perl
1770error. You need to make sure your script is executable, is accessible
1771by the user CGI is running the script under (which is probably not
1772the user account you tested it under), does not rely on any environment
1773variables (like PATH) from the user it isn't running under, and isn't
1774in a location where the CGI server can't find it, basically, more or less.
1775
a0d0e21e
LW
1776=item setegid() not implemented
1777
1778(F) You tried to assign to $), and your operating system doesn't support
1779the setegid() system call (or equivalent), or at least Configure didn't
1780think so.
1781
1782=item seteuid() not implemented
1783
1784(F) You tried to assign to $>, and your operating system doesn't support
1785the seteuid() system call (or equivalent), or at least Configure didn't
1786think so.
1787
1788=item setrgid() not implemented
1789
1790(F) You tried to assign to $(, and your operating system doesn't support
1791the setrgid() system call (or equivalent), or at least Configure didn't
1792think so.
1793
1794=item setruid() not implemented
1795
1796(F) You tried to assign to $<, and your operating system doesn't support
1797the setruid() system call (or equivalent), or at least Configure didn't
1798think so.
1799
1800=item Setuid/gid script is writable by world
1801
1802(F) The setuid emulator won't run a script that is writable by the world,
1803because the world might have written on it already.
1804
1805=item shm%s not implemented
1806
1807(F) You don't have System V shared memory IPC on your system.
1808
1809=item shutdown() on closed fd
1810
1811(W) You tried to do a shutdown on a closed socket. Seems a bit superfluous.
1812
1813=item SIG%s handler "%s" not defined.
1814
1815(W) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you
1816put it into the wrong package?
1817
1818=item sort is now a reserved word
1819
1820(F) An ancient error message that almost nobody ever runs into anymore.
1821But before sort was a keyword, people sometimes used it as a filehandle.
1822
1823=item Sort subroutine didn't return a numeric value
1824
1825(F) A sort comparison routine must return a number. You probably blew
4633a7c4 1826it by not using C<E<lt>=E<gt>> or C<cmp>, or by not using them correctly.
a0d0e21e
LW
1827See L<perlfunc/sort>.
1828
1829=item Sort subroutine didn't return single value
1830
1831(F) A sort comparison subroutine may not return a list value with more
1832or less than one element. See L<perlfunc/sort>.
1833
1834=item Split loop
1835
1836(P) The split was looping infinitely. (Obviously, a split shouldn't iterate
1837more times than there are characters of input, which is what happened.)
1838See L<perlfunc/split>.
1839
1840=item Stat on unopened file <%s>
1841
1842(W) You tried to use the stat() function (or an equivalent file test)
1843on a filehandle that was either never opened or has been closed since.
1844
1845=item Statement unlikely to be reached
1846
1847(W) You did an exec() with some statement after it other than a die().
1848This is almost always an error, because exec() never returns unless
1849there was a failure. You probably wanted to use system() instead,
1850which does return. To suppress this warning, put the exec() in a block
1851by itself.
1852
1853=item Subroutine %s redefined
1854
1855(W) You redefined a subroutine. To suppress this warning, say
1856
1857 {
1858 local $^W = 0;
1859 eval "sub name { ... }";
1860 }
1861
1862=item Substitution loop
1863
1864(P) The substitution was looping infinitely. (Obviously, a
1865substitution shouldn't iterate more times than there are characters of
1866input, which is what happened.) See the discussion of substitution in
1867L<perlop/"Quote and Quotelike Operators">.
1868
1869=item Substitution pattern not terminated
1870
1871(F) The lexer couldn't find the interior delimiter of a s/// or s{}{}
1872construct. Remember that bracketing delimiters count nesting level.
1873
1874=item Substitution replacement not terminated
1875
1876(F) The lexer couldn't find the final delimiter of a s/// or s{}{}
1877construct. Remember that bracketing delimiters count nesting level.
1878
1879=item substr outside of string
1880
1881(W) You tried to reference a substr() that pointed outside of a string.
1882That is, the absolute value of the offset was larger than the length of
1883the string. See L<perlfunc/substr>.
1884
1885=item suidperl is no longer needed since...
1886
1887(F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but a
1888version of the setuid emulator somehow got run anyway.
1889
1890=item syntax error
1891
1892(F) Probably means you had a syntax error. Common reasons include:
1893
1894 A keyword is misspelled.
1895 A semicolon is missing.
1896 A comma is missing.
1897 An opening or closing parenthesis is missing.
1898 An opening or closing brace is missing.
1899 A closing quote is missing.
1900
1901Often there will be another error message associated with the syntax
1902error giving more information. (Sometimes it helps to turn on B<-w>.)
1903The error message itself often tells you where it was in the line when
1904it decided to give up. Sometimes the actual error is several tokens
1905before this, since Perl is good at understanding random input.
1906Occasionally the line number may be misleading, and once in a blue moon
1907the only way to figure out what's triggering the error is to call
1908C<perl -c> repeatedly, chopping away half the program each time to see
1909if the error went away. Sort of the cybernetic version of S<20 questions>.
1910
cb1a09d0
AD
1911=item syntax error at line %d: `%s' unexpected
1912
1913(A) You've accidentally run your script through the Bourne shell
1914instead of Perl. Check the <#!> line, or manually feed your script
1915into Perl yourself.
1916
a0d0e21e
LW
1917=item System V IPC is not implemented on this machine
1918
1919(F) You tried to do something with a function beginning with "sem", "shm"
1920or "msg". See L<perlfunc/semctl>, for example.
1921
1922=item Syswrite on closed filehandle
1923
1924(W) The filehandle you're writing to got itself closed sometime before now.
1925Check your logic flow.
1926
1927=item tell() on unopened file
1928
1929(W) You tried to use the tell() function on a filehandle that was either
1930never opened or has been closed since.
1931
1932=item Test on unopened file <%s>
1933
1934(W) You tried to invoke a file test operator on a filehandle that isn't
1935open. Check your logic. See also L<perlfunc/-X>.
1936
1937=item That use of $[ is unsupported
1938
1939(F) Assignment to $[ is now strictly circumscribed, and interpreted as
1940a compiler directive. You may only say one of
1941
1942 $[ = 0;
1943 $[ = 1;
1944 ...
1945 local $[ = 0;
1946 local $[ = 1;
1947 ...
1948
1949This is to prevent the problem of one module changing the array base
1950out from under another module inadvertently. See L<perlvar/$[>.
1951
1952=item The %s function is unimplemented
1953
1954The function indicated isn't implemented on this architecture, according
1955to the probings of Configure.
1956
1957=item The crypt() function is unimplemented due to excessive paranoia.
1958
1959(F) Configure couldn't find the crypt() function on your machine,
1960probably because your vendor didn't supply it, probably because they
1961think the U.S. Govermnment thinks it's a secret, or at least that they
1962will continue to pretend that it is. And if you quote me on that, I
1963will deny it.
1964
1965=item The stat preceding C<-l _> wasn't an lstat
1966
1967(F) It makes no sense to test the current stat buffer for symbolic linkhood
1968if the last stat that wrote to the stat buffer already went past
1969the symlink to get to the real file. Use an actual filename instead.
1970
1971=item times not implemented
1972
1973(F) Your version of the C library apparently doesn't do times(). I suspect
1974you're not running on Unix.
1975
1976=item Too few args to syscall
1977
1978(F) There has to be at least one argument to syscall() to specify the
1979system call to call, silly dilly.
1980
cb1a09d0
AD
1981=item Too many ('s
1982
1983=item Too many )'s
1984
1985(A) You've accidentally run your script through B<csh> instead
1986of Perl. Check the <#!> line, or manually feed your script
1987into Perl yourself.
1988
a0d0e21e
LW
1989=item Too many args to syscall
1990
1991(F) Perl only supports a maximum of 14 args to syscall().
1992
1993=item Too many arguments for %s
1994
1995(F) The function requires fewer arguments than you specified.
1996
1997=item trailing \ in regexp
1998
1999(F) The regular expression ends with an unbackslashed backslash. Backslash
2000it. See L<perlre>.
2001
2002=item Translation pattern not terminated
2003
2004(F) The lexer couldn't find the interior delimiter of a tr/// or tr[][]
2005construct.
2006
2007=item Translation replacement not terminated
2008
2009(F) The lexer couldn't find the final delimiter of a tr/// or tr[][]
2010construct.
2011
2012=item truncate not implemented
2013
2014(F) Your machine doesn't implement a file truncation mechanism that
2015Configure knows about.
2016
2017=item Type of arg %d to %s must be %s (not %s)
2018
2019(F) This function requires the argument in that position to be of a
2020certain type. Arrays must be @NAME or @{EXPR}. Hashes must be
2021%NAME or %{EXPR}. No implicit dereferencing is allowed--use the
2022{EXPR} forms as an explicit dereference. See L<perlref>.
2023
2024=item umask: argument is missing initial 0
2025
2026(W) A umask of 222 is incorrect. It should be 0222, since octal literals
2027always start with 0 in Perl, as in C.
2028
4633a7c4
LW
2029=item Unable to create sub named "%s"
2030
2031(F) You attempted to create or access a subroutine with an illegal name.
2032
a0d0e21e
LW
2033=item Unbalanced context: %d more PUSHes than POPs
2034
2035(W) The exit code detected an internal inconsistency in how many execution
2036contexts were entered and left.
2037
2038=item Unbalanced saves: %d more saves than restores
2039
2040(W) The exit code detected an internal inconsistency in how many
2041values were temporarily localized.
2042
2043=item Unbalanced scopes: %d more ENTERs than LEAVEs
2044
2045(W) The exit code detected an internal inconsistency in how many blocks
2046were entered and left.
2047
2048=item Unbalanced tmps: %d more allocs than frees
2049
2050(W) The exit code detected an internal inconsistency in how many mortal
2051scalars were allocated and freed.
2052
2053=item Undefined format "%s" called
2054
2055(F) The format indicated doesn't seem to exist. Perhaps it's really in
2056another package? See L<perlform>.
2057
2058=item Undefined sort subroutine "%s" called
2059
2060(F) The sort comparison routine specified doesn't seem to exist. Perhaps
2061it's in a different package? See L<perlfunc/sort>.
2062
2063=item Undefined subroutine &%s called
2064
2065(F) The subroutine indicated hasn't been defined, or if it was, it
2066has since been undefined.
2067
2068=item Undefined subroutine called
2069
2070(F) The anonymous subroutine you're trying to call hasn't been defined,
2071or if it was, it has since been undefined.
2072
2073=item Undefined subroutine in sort
2074
2075(F) The sort comparison routine specified is declared but doesn't seem to
2076have been defined yet. See L<perlfunc/sort>.
2077
4633a7c4
LW
2078=item Undefined top format "%s" called
2079
2080(F) The format indicated doesn't seem to exist. Perhaps it's really in
2081another package? See L<perlform>.
2082
a0d0e21e
LW
2083=item unexec of %s into %s failed!
2084
2085(F) The unexec() routine failed for some reason. See your local FSF
2086representative, who probably put it there in the first place.
2087
2088=item Unknown BYTEORDER
2089
2090(F) There are no byteswapping functions for a machine with this byte order.
2091
2092=item unmatched () in regexp
2093
2094(F) Unbackslashed parentheses must always be balanced in regular
2095expressions. If you're a vi user, the % key is valuable for finding
2096the matching paren. See L<perlre>.
2097
2098=item Unmatched right bracket
2099
2100(F) The lexer counted more closing curly brackets (braces) than opening
2101ones, so you're probably missing an opening bracket. As a general
2102rule, you'll find the missing one (so to speak) near the place you were
2103last editing.
2104
2105=item unmatched [] in regexp
2106
2107(F) The brackets around a character class must match. If you wish to
2108include a closing bracket in a character class, backslash it or put it first.
2109See L<perlre>.
2110
2111=item Unquoted string "%s" may clash with future reserved word
2112
2113(W) You used a bare word that might someday be claimed as a reserved word.
2114It's best to put such a word in quotes, or capitalize it somehow, or insert
2115an underbar into it. You might also declare it as a subroutine.
2116
2117=item Unrecognized character \%03o ignored
2118
2119(S) A garbage character was found in the input, and ignored, in case it's
2120a weird control character on an EBCDIC machine, or some such.
2121
2122=item Unrecognized signal name "%s"
2123
2124(F) You specified a signal name to the kill() function that was not recognized.
2125Say C<kill -l> in your shell to see the valid signal names on your system.
2126
2127=item Unrecognized switch: -%s
2128
2129(F) You specified an illegal option to Perl. Don't do that.
2130(If you think you didn't do that, check the #! line to see if it's
2131supplying the bad switch on your behalf.)
2132
2133=item Unsuccessful %s on filename containing newline
2134
2135(W) A file operation was attempted on a filename, and that operation
2136failed, PROBABLY because the filename contained a newline, PROBABLY
2137because you forgot to chop() or chomp() it off. See L<perlfunc/chop>.
2138
2139=item Unsupported directory function "%s" called
2140
2141(F) Your machine doesn't support opendir() and readdir().
2142
2143=item Unsupported function %s
2144
2145(F) This machines doesn't implement the indicated function, apparently.
2146At least, Configure doesn't think so.
2147
2148=item Unsupported socket function "%s" called
2149
2150(F) Your machine doesn't support the Berkeley socket mechanism, or at
2151least that's what Configure thought.
2152
2153=item Unterminated <> operator
2154
2155(F) The lexer saw a left angle bracket in a place where it was expecting
2156a term, so it's looking for the corresponding right angle bracket, and not
2157finding it. Chances are you left some needed parentheses out earlier in
2158the line, and you really meant a "less than".
2159
2160=item Use of $# is deprecated
2161
2162(D) This was an ill-advised attempt to emulate a poorly defined awk feature.
2163Use an explicit printf() or sprintf() instead.
2164
2165=item Use of $* is deprecated
2166
2167(D) This variable magically turned on multiline pattern matching, both for
2168you and for any luckless subroutine that you happen to call. You should
2169use the new C<//m> and C<//s> modifiers now to do that without the dangerous
2170action-at-a-distance effects of C<$*>.
2171
748a9306
LW
2172=item Use of %s in printf format not supported
2173
2174(F) You attempted to use a feature of printf that is accessible only
2175from C. This usually means there's a better way to do it in Perl.
2176
a0d0e21e
LW
2177=item Use of %s is deprecated
2178
2179(D) The construct indicated is no longer recommended for use, generally
2180because there's a better way to do it, and also because the old way has
2181bad side effects.
2182
4633a7c4
LW
2183=item Use of bare << to mean <<"" is deprecated
2184
2185(D) You are now encouraged to use the explicitly quoted form if you
2186wish to use a blank line as the terminator of the here-document.
2187
a0d0e21e
LW
2188=item Use of implicit split to @_ is deprecated
2189
2190(D) It makes a lot of work for the compiler when you clobber a
2191subroutine's argument list, so it's better if you assign the results of
2192a split() explicitly to an array (or list).
2193
2194=item Use of uninitialized value
2195
2196(W) An undefined value was used as if it were already defined. It was
2197interpreted as a "" or a 0, but maybe it was a mistake. To suppress this
2198warning assign an initial value to your variables.
2199
2200=item Useless use of %s in void context
2201
2202(W) You did something without a side effect in a context that does nothing
2203with the return value, such as a statement that doesn't return a value
2204from a block, or the left side of a scalar comma operator. Very often
2205this points not to stupidity on your part, but a failure of Perl to parse
2206your program the way you thought it would. For example, you'd get this
2207if you mixed up your C precedence with Python precedence and said
2208
2209 $one, $two = 1, 2;
2210
2211when you meant to say
2212
2213 ($one, $two) = (1, 2);
2214
748a9306
LW
2215Another common error is to use ordinary parentheses to construct a list
2216reference when you should be using square or curly brackets, for
2217example, if you say
2218
2219 $array = (1,2);
2220
2221when you should have said
2222
2223 $array = [1,2];
2224
2225The square brackets explicitly turn a list value into a scalar value,
2226while parentheses do not. So when a parenthesized list is evaluated in
2227a scalar context, the comma is treated like C's comma operator, which
2228throws away the left argument, which is not what you want. See
2229L<perlref> for more on this.
2230
4633a7c4
LW
2231=item Variable "%s" is not exported
2232
2233(F) While "use strict" in effect, you referred to a global variable
2234that you apparently thought was imported from another module, because
2235something else of the same name (usually a subroutine) is exported
2236by that module. It usually means you put the wrong funny character
2237on the front of your variable.
2238
cb1a09d0
AD
2239=item Variable syntax.
2240
2241(A) You've accidentally run your script through B<csh> instead
2242of Perl. Check the <#!> line, or manually feed your script
2243into Perl yourself.
2244
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LW
2245=item Warning: unable to close filehandle %s properly.
2246
2247(S) The implicit close() done by an open() got an error indication on the
2ba9eb46 2248close(). This usually indicates your filesystem ran out of disk space.
a0d0e21e
LW
2249
2250=item Warning: Use of "%s" without parens is ambiguous
2251
2252(S) You wrote a unary operator followed by something that looks like a
2253binary operator that could also have been interpreted as a term or
2254unary operator. For instance, if you know that the rand function
2255has a default argument of 1.0, and you write
2256
2257 rand + 5;
2258
2259you may THINK you wrote the same thing as
2260
2261 rand() + 5;
2262
2263but in actual fact, you got
2264
2265 rand(+5);
2266
2267So put in parens to say what you really mean.
2268
2269=item Write on closed filehandle
2270
2271(W) The filehandle you're writing to got itself closed sometime before now.
2272Check your logic flow.
2273
2274=item X outside of string
2275
2276(F) You had a pack template that specified a relative position before
2277the beginning of the string being unpacked. See L<perlfunc/pack>.
2278
2279=item x outside of string
2280
2281(F) You had a pack template that specified a relative position after
2282the end of the string being unpacked. See L<perlfunc/pack>.
2283
2284=item Xsub "%s" called in sort
2285
2286(F) The use of an external subroutine as a sort comparison is not yet supported.
2287
2288=item Xsub called in sort
2289
2290(F) The use of an external subroutine as a sort comparison is not yet supported.
2291
2292=item You can't use C<-l> on a filehandle
2293
2294(F) A filehandle represents an opened file, and when you opened the file it
2295already went past any symlink you are presumably trying to look for.
2296Use a filename instead.
2297
2298=item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
2299
2300(F) And you probably never will, since you probably don't have the
2301sources to your kernel, and your vendor probably doesn't give a rip
2302about what you want. Your best bet is to use the wrapsuid script in
2303the eg directory to put a setuid C wrapper around your script.
2304
2305=item You need to quote "%s"
2306
2307(W) You assigned a bareword as a signal handler name. Unfortunately, you
2308already have a subroutine of that name declared, which means that Perl 5
2309will try to call the subroutine when the assignment is executed, which is
2310probably not what you want. (If it IS what you want, put an & in front.)
2311
2312=item [gs]etsockopt() on closed fd
2313
2314(W) You tried to get or set a socket option on a closed socket.
2315Did you forget to check the return value of your socket() call?
2316See L<perlfunc/getsockopt>.
2317
2318=item \1 better written as $1
2319
2320(W) Outside of patterns, backreferences live on as variables. The use
2321of backslashes is grandfathered on the righthand side of a
2322substitution, but stylistically it's better to use the variable form
2323because other Perl programmers will expect it, and it works better
2324if there are more than 9 backreferences.
2325
748a9306
LW
2326=item '|' and '<' may not both be specified on command line
2327
2328(F) An error peculiar to VMS. Perl does its own command line redirection, and
2329found that STDIN was a pipe, and that you also tried to redirect STDIN using
2330'<'. Only one STDIN stream to a customer, please.
2331
2332=item '|' and '>' may not both be specified on command line
2333
2334(F) An error peculiar to VMS. Perl does its own command line redirection, and
2335thinks you tried to redirect stdout both to a file and into a pipe to another
2336command. You need to choose one or the other, though nothing's stopping you
2337from piping into a program or Perl script which 'splits' output into two
2338streams, such as
2339
2340 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
2341 while (<STDIN>) {
2342 print;
2343 print OUT;
2344 }
2345 close OUT;
2346
a0d0e21e
LW
2347=back
2348