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[perl5.git] / pod / perldiag.pod
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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).
16
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17Optional warnings are enabled by using the B<-w> switch. Warnings may
18be captured by setting C<$^Q> to a reference to a routine that will be
19called on each warning instead of printing it. See L<perlvar>.
20Trappable errors may be trapped using the eval operator. See
21L<perlfunc/eval>.
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22
23Some of these messages are generic. Spots that vary are denoted with a %s,
24just as in a printf format. Note that some message start with a %s!
25The symbols C<"%-?@> sort before the letters, while C<[> and C<\> sort after.
26
27=over 4
28
29=item "my" variable %s can't be in a package
30
31(F) Lexically scoped variables aren't in a package, so it doesn't make sense
32to try to declare one with a package qualifier on the front. Use local()
33if you want to localize a package variable.
34
35=item "no" not allowed in expression
36
37(F) The "no" keyword is recognized and executed at compile time, and returns
38no useful value. See L<perlmod>.
39
40=item "use" not allowed in expression
41
42(F) The "use" keyword is recognized and executed at compile time, and returns
43no useful value. See L<perlmod>.
44
45=item % may only be used in unpack
46
47(F) You can't pack a string by supplying a checksum, since the
48checksumming process loses information, and you can't go the other
49way. See L<perlfunc/unpack>.
50
51=item %s (...) interpreted as function
52
53(W) You've run afoul of the rule that says that any list operator followed
54by parentheses turns into a function, with all the list operators arguments
55found inside the parens. See L<perlop/Terms and List Operators (Leftward)>.
56
57=item %s argument is not a HASH element
58
59(F) The argument to delete() or exists() must be a hash element, such as
60
61 $foo{$bar}
62 $ref->[12]->{"susie"}
63
64=item %s did not return a true value
65
66(F) A required (or used) file must return a true value to indicate that
67it compiled correctly and ran its initialization code correctly. It's
68traditional to end such a file with a "1;", though any true value would
69do. See L<perlfunc/require>.
70
71=item %s found where operator expected
72
73(S) The Perl lexer knows whether to expect a term or an operator. If it
74sees what it knows to be a term when it was expecting to see an operator,
75it gives you this warning. Usually it indicates that an operator or
76delimiter was omitted, such as a semicolon.
77
78=item %s had compilation errors.
79
80(F) The final summary message when a C<perl -c> fails.
81
82=item %s has too many errors.
83
84(F) The parser has given up trying to parse the program after 10 errors.
85Further error messages would likely be uninformative.
86
87=item %s matches null string many times
88
89(W) The pattern you've specified would be an infinite loop if the
90regular expression engine didn't specifically check for that. See L<perlre>.
91
92=item %s never introduced
93
94(S) The symbol in question was declared but somehow went out of scope
95before it could possibly have been used.
96
97=item %s syntax OK
98
99(F) The final summary message when a C<perl -c> succeeds.
100
101=item B<-P> not allowed for setuid/setgid script
102
103(F) The script would have to be opened by the C preprocessor by name,
104which provides a race condition that breaks security.
105
106=item C<-T> and C<-B> not implemented on filehandles
107
108(F) Perl can't peek at the stdio buffer of filehandles when it doesn't
109know about your kind of stdio. You'll have to use a filename instead.
110
111=item ?+* follows nothing in regexp
112
113(F) You started a regular expression with a quantifier. Backslash it
114if you meant it literally. See L<perlre>.
115
116=item @ outside of string
117
118(F) You had a pack template that specified an absolution position outside
119the string being unpacked. See L<perlfunc/pack>.
120
121=item accept() on closed fd
122
123(W) You tried to do an accept on a closed socket. Did you forget to check
124the return value of your socket() call? See L<perlfunc/accept>.
125
126=item Allocation too large: %lx
127
128(F) You can't allocate more than 64K on an MSDOS machine.
129
130=item Arg too short for msgsnd
131
132(F) msgsnd() requires a string at least as long as sizeof(long).
133
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134=item Ambiguous use of %s resolved as %s
135
136(W)(S) You said something that may not be interpreted the way
137you thought. Normally it's pretty easy to disambiguate it by supplying
138a missing quote, operator, paren pair or declaration.
139
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140=item Args must match #! line
141
142(F) The setuid emulator requires that the arguments Perl was invoked
143with match the arguments specified on the #! line.
144
145=item Argument "%s" isn't numeric
146
147(W) The indicated string was fed as an argument to an operator that
148expected a numeric value instead. If you're fortunate the message
149will identify which operator was so unfortunate.
150
151=item Array @%s missing the @ in argument %d of %s()
152
153(D) Really old Perl let you omit the @ on array names in some spots. This
154is now heavily deprecated.
155
156=item assertion botched: %s
157
158(P) The malloc package that comes with Perl had an internal failure.
159
160=item Assertion failed: file "%s"
161
162(P) A general assertion failed. The file in question must be examined.
163
164=item Assignment to both a list and a scalar
165
166(F) If you assign to a conditional operator, the 2nd and 3rd arguments
167must either both be scalars or both be lists. Otherwise Perl won't
168know which context to supply to the right side.
169
170=item Attempt to free non-arena SV: 0x%lx
171
172(P) All SV objects are supposed to be allocated from arenas that will
173be garbage collected on exit. An SV was discovered to be outside any
174of those arenas.
175
176=item Attempt to free temp prematurely
177
178(W) Mortalized values are supposed to be freed by the free_tmps()
179routine. This indicates that something else is freeing the SV before
180the free_tmps() routine gets a chance, which means that the free_tmps()
181routine will be freeing an unreferenced scalar when it does try to free
182it.
183
184=item Attempt to free unreferenced glob pointers
185
186(P) The reference counts got screwed up on symbol aliases.
187
188=item Attempt to free unreferenced scalar
189
190(W) Perl went to decrement the reference count of a scalar to see if it
191would go to 0, and discovered that it had already gone to 0 earlier,
192and should have been freed, and in fact, probably was freed. This
193could indicate that SvREFCNT_dec() was called too many times, or that
194SvREFCNT_inc() was called too few times, or that the SV was mortalized
195when it shouldn't have been, or that memory has been corrupted.
196
197=item Bad arg length for %s, is %d, should be %d
198
199(F) You passed a buffer of the wrong size to one of msgctl(), semctl() or
200shmctl(). In C parlance, the correct sized are, respectively,
201S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)> and
202S<sizeof(struct shmid_ds *)>.
203
204=item Bad associative array
205
206(P) One of the internal hash routines was passed a null HV pointer.
207
208=item Bad filehandle: %s
209
210(F) A symbol was passed to something wanting a filehandle, but the symbol
211has no filehandle associated with it. Perhaps you didn't do an open(), or
212did it in another package.
213
214=item Bad free() ignored
215
216(S) An internal routine called free() on something that had never been
217malloc()ed in the first place.
218
219=item Bad name after %s::
220
221(F) You started to name a symbol by using a package prefix, and then didn't
222finish the symbol. In particular, you can't interpolate outside of quotes,
223so
224
225 $var = 'myvar';
226 $sym = mypack::$var;
227
228is not the same as
229
230 $var = 'myvar';
231 $sym = "mypack::$var";
232
233=item Bad symbol for array
234
235(P) An internal request asked to add an array entry to something that
236wasn't a symbol table entry.
237
238=item Bad symbol for filehandle
239
240(P) An internal request asked to add a filehandle entry to something that
241wasn't a symbol table entry.
242
243=item Bad symbol for hash
244
245(P) An internal request asked to add a hash entry to something that
246wasn't a symbol table entry.
247
248=item BEGIN failed--compilation aborted
249
250(F) An untrapped exception was raised while executing a BEGIN subroutine.
251Compilation stops immediately and the interpreter is exited.
252
253=item bind() on closed fd
254
255(W) You tried to do a bind on a closed socket. Did you forget to check
256the return value of your socket() call? See L<perlfunc/bind>.
257
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258=item Bizarre copy of %s in %s
259
260(P) Perl detected an attempt to copy an internal value that is not copiable.
261
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262=item Callback called exit
263
264(F) A subroutine invoked from an external package via perl_call_sv()
265exited by calling exit.
266
267=item Can't "last" outside a block
268
269(F) A "last" statement was executed to break out of the current block,
270except that there's this itty bitty problem called there isn't a
271current block. Note that an "if" or "else" block doesn't count as a
272"loopish" block. You can usually double the curlies to get the same
273effect though, since the inner curlies will be considered a block
274that loops once. See L<perlfunc/last>.
275
276=item Can't "next" outside a block
277
278(F) A "next" statement was executed to reiterate the current block, but
279there isn't a current block. Note that an "if" or "else" block doesn't
280count as a "loopish" block. You can usually double the curlies to get
281the same effect though, since the inner curlies will be considered a block
282that loops once. See L<perlfunc/last>.
283
284=item Can't "redo" outside a block
285
286(F) A "redo" statement was executed to restart the current block, but
287there isn't a current block. Note that an "if" or "else" block doesn't
288count as a "loopish" block. You can usually double the curlies to get
289the same effect though, since the inner curlies will be considered a block
290that loops once. See L<perlfunc/last>.
291
292=item Can't bless non-reference value
293
294(F) Only hard references may be blessed. This is how Perl "enforces"
295encapsulation of objects. See L<perlobj>.
296
297=item Can't break at that line
298
299(S) A warning intended for while running within the debugger, indicating
300the line number specified wasn't the location of a statement that could
301be stopped at.
302
303=item Can't call method "%s" in empty package "%s"
304
305(F) You called a method correctly, and it correctly indicated a package
306functioning as a class, but that package doesn't have ANYTHING defined
307in it, let alone methods. See L<perlobj>.
308
309=item Can't call method "%s" on unblessed reference
310
311(F) A method call must know what package it's supposed to run in. It
312ordinarily finds this out from the object reference you supply, but
313you didn't supply an object reference in this case. A reference isn't
314an object reference until it has been blessed. See L<perlobj>.
315
316=item Can't call method "%s" without a package or object reference
317
318(F) You used the syntax of a method call, but the slot filled by the
319object reference or package name contains an expression that returns
320neither an object reference nor a package name. (Perhaps it's null?)
321Something like this will reproduce the error:
322
323 $BADREF = undef;
324 process $BADREF 1,2,3;
325 $BADREF->process(1,2,3);
326
327=item Can't chdir to %s
328
329(F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
330that you can chdir to, possibly because it doesn't exist.
331
332=item Can't coerce %s to integer in %s
333
334(F) Certain types of SVs, in particular real symbol table entries
335(type GLOB), can't be forced to stop being what they are. So you can't
336say things like:
337
338 *foo += 1;
339
340You CAN say
341
342 $foo = *foo;
343 $foo += 1;
344
345but then $foo no longer contains a glob.
346
347=item Can't coerce %s to number in %s
348
349(F) Certain types of SVs, in particular real symbol table entries
350(type GLOB), can't be forced to stop being what they are.
351
352=item Can't coerce %s to string in %s
353
354(F) Certain types of SVs, in particular real symbol table entries
355(type GLOB), can't be forced to stop being what they are.
356
357=item Can't create pipe mailbox
358
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359(P) An error peculiar to VMS. The process is suffering from exhausted quotas
360or other plumbing problems.
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361
362=item Can't declare %s in my
363
364(F) Only scalar, array and hash variables may be declared as lexical variables.
365They must have ordinary identifiers as names.
366
367=item Can't do inplace edit on %s: %s
368
369(S) The creation of the new file failed for the indicated reason.
370
371=item Can't do inplace edit without backup
372
373(F) You're on a system such as MSDOS that gets confused if you try reading
374from a deleted (but still opened) file. You have to say B<-i>C<.bak>, or some
375such.
376
377=item Can't do inplace edit: %s > 14 characters
378
379(S) There isn't enough room in the filename to make a backup name for the file.
380
381=item Can't do inplace edit: %s is not a regular file
382
383(S) You tried to use the B<-i> switch on a special file, such as a file in
384/dev, or a FIFO. The file was ignored.
385
386=item Can't do setegid!
387
388(P) The setegid() call failed for some reason in the setuid emulator
389of suidperl.
390
391=item Can't do seteuid!
392
393(P) The setuid emulator of suidperl failed for some reason.
394
395=item Can't do setuid
396
397(F) This typically means that ordinary perl tried to exec suidperl to
398do setuid emulation, but couldn't exec it. It looks for a name of the
399form sperl5.000 in the same directory that the perl executable resides
400under the name perl5.000, typically /usr/local/bin on Unix machines.
401If the file is there, check the execute permissions. If it isn't, ask
402your sysadmin why he and/or she removed it.
403
404=item Can't do waitpid with flags
405
406(F) This machine doesn't have either waitpid() or wait4(), so only waitpid()
407without flags is emulated.
408
409=item Can't do {n,m} with n > m
410
411(F) Minima must be less than or equal to maxima. If you really want
412your regexp to match something 0 times, just put {0}. See L<perlre>.
413
414=item Can't emulate -%s on #! line
415
416(F) The #! line specifies a switch that doesn't make sense at this point.
417For example, it'd be kind of silly to put a B<-x> on the #! line.
418
419=item Can't exec "%s": %s
420
421(W) An system(), exec() or piped open call could not execute the named
422program for the indicated reason. Typical reasons include: the permissions
423were wrong on the file, the file wasn't found in C<$ENV{PATH}>, the
424executable in question was compiled for another architecture, or the
425#! line in a script points to an interpreter that can't be run for
426similar reasons. (Or maybe your system doesn't support #! at all.)
427
428=item Can't exec %s
429
430(F) Perl was trying to execute the indicated program for you because that's
431what the #! line said. If that's not what you wanted, you may need to
432mention "perl" on the #! line somewhere.
433
434=item Can't execute %s
435
436(F) You used the B<-S> switch, but the script to execute could not be found
437in the PATH, or at least not with the correct permissions.
438
439=item Can't find label %s
440
441(F) You said to goto a label that isn't mentioned anywhere that it's possible
442for us to go to. See L<perlfunc/goto>.
443
444=item Can't find string terminator %s anywhere before EOF
445
446(F) Perl strings can stretch over multiple lines. This message means that
447the closing delimiter was omitted. Since bracketed quotes count nesting
448levels, the following is missing its final parenthesis:
449
450 print q(The character '(' starts a side comment.)
451
452=item Can't fork
453
454(F) A fatal error occurred while trying to fork while opening a pipeline.
455
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456=item Can't get filespec - stale stat buffer?
457
458(S) A warning peculiar to VMS. This arises because of the difference between
459access checks under VMS and under the Unix model Perl assumes. Under VMS,
460access checks are done by filename, rather than by bits in the stat buffer, so
461that ACLs and other protections can be taken into account. Unfortunately, Perl
462assumes that the stat buffer contains all the necessary information, and passes
463it, instead of the filespec, to the access checking routine. It will try to
464retrieve the filespec using the device name and FID present in the stat buffer,
465but this works only if you haven't made a subsequent call to the CRTL stat()
466routine, since the device name is overwritten with each call. If this warning
467appears, the name lookup failed, and the access checking routine gave up and
468returned FALSE, just to be conservative. (Note: The access checking routine
469knows about the Perl C<stat> operator and file tests, so you shouldn't ever
470see this warning in response to a Perl command; it arises only if some internal
471code takes stat buffers lightly.)
472
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473=item Can't get pipe mailbox device name
474
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475(P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl
476can't retrieve its name for later use.
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477
478=item Can't get SYSGEN parameter value for MAXBUF
479
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480(P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
481mailbox buffers to be, and didn't get an answer.
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482
483=item Can't goto subroutine outside a subroutine
484
485(F) The deeply magical "goto subroutine" call can only replace one subroutine
486call for another. It can't manufacture one out of whole cloth. In general
487you should only be calling it out of an AUTOLOAD routine anyway. See
488L<perlfunc/goto>.
489
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490=item Can't localize a reference
491
492(F) You said something like C<local $$ref>, which is not allowed because
493the compiler can't determine whether $ref will end up pointing to anything
494with a symbol table entry, and a symbol table entry is necessary to
495do a local.
496
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497=item Can't localize lexical variable %s
498
499(F) You used local on a variable name that was previous declared as a
500lexical variable using "my". This is not allowed. If you want to
501localize a package variable of the same name, qualify it with the
502package name.
503
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504=item Can't locate %s in @INC
505
506(F) You said to do (or require, or use) a file that couldn't be found
507in any of the libraries mentioned in @INC. Perhaps you need to set
508the PERL5LIB environment variable to say where the extra library is,
509or maybe the script needs to add the library name to @INC. Or maybe
510you just misspelled the name of the file. See L<perlfunc/require>.
511
512=item Can't locate object method "%s" via package "%s"
513
514(F) You called a method correctly, and it correctly indicated a package
515functioning as a class, but that package doesn't define that particular
516method, nor does any of it's base classes. See L<perlobj>.
517
518=item Can't locate package %s for @%s::ISA
519
520(W) The @ISA array contained the name of another package that doesn't seem
521to exist.
522
523=item Can't mktemp()
524
525(F) The mktemp() routine failed for some reason while trying to process
526a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
527
528=item Can't modify %s in %s
529
530(F) You aren't allowed to assign to the item indicated, or otherwise try to
531change it, such as with an autoincrement.
532
533=item Can't modify non-existent substring
534
535(P) The internal routine that does assignment to a substr() was handed
536a NULL.
537
538=item Can't msgrcv to readonly var
539
540(F) The target of a msgrcv must be modifiable in order to be used as a receive
541buffer.
542
543=item Can't open %s: %s
544
545(S) An inplace edit couldn't open the original file for the indicated reason.
546Usually this is because you don't have read permission for the file.
547
548=item Can't open bidirectional pipe
549
550(W) You tried to say C<open(CMD, "|cmd|")>, which is not supported. You can
551try any of several modules in the Perl library to do this, such as
552"open2.pl". Alternately, direct the pipe's output to a file using ">",
553and then read it in under a different file handle.
554
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555=item Can't open error file %s as stderr
556
557(F) An error peculiar to VMS. Perl does its own command line redirection, and
558couldn't open the file specified after '2>' or '2>>' on the command line for
559writing.
560
561=item Can't open input file %s as stdin
562
563(F) An error peculiar to VMS. Perl does its own command line redirection, and
564couldn't open the file specified after '<' on the command line for reading.
565
566=item Can't open output file %s as stdout
567
568(F) An error peculiar to VMS. Perl does its own command line redirection, and
569couldn't open the file specified after '>' or '>>' on the command line for
570writing.
571
572=item Can't open output pipe (name: %s)
573
574(P) An error peculiar to VMS. Perl does its own command line redirection, and
575couldn't open the pipe into which to send data destined for stdout.
576
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577=item Can't open perl script "%s": %s
578
579(F) The script you specified can't be opened for the indicated reason.
580
581=item Can't rename %s to %s: %s, skipping file
582
583(S) The rename done by the B<-i> switch failed for some reason, probably because
584you don't have write permission to the directory.
585
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586=item Can't reopen input pipe (name: %s) in binary mode
587
588(P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to
589reopen it to accept binary data. Alas, it failed.
590
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591=item Can't reswap uid and euid
592
593(P) The setreuid() call failed for some reason in the setuid emulator
594of suidperl.
595
596=item Can't return outside a subroutine
597
598(F) The return statement was executed in mainline code, that is, where
599there was no subroutine call to return out of. See L<perlsub>.
600
601=item Can't stat script "%s"
602
603(P) For some reason you can't fstat() the script even though you have
604it open already. Bizarre.
605
606=item Can't swap uid and euid
607
608(P) The setreuid() call failed for some reason in the setuid emulator
609of suidperl.
610
611=item Can't take log of %g
612
613(F) Logarithms are only defined on positive real numbers.
614
615=item Can't take sqrt of %g
616
617(F) For ordinary real numbers, you can't take the square root of a
618negative number. There's a Complex package available for Perl, though,
619if you really want to do that.
620
621=item Can't undef active subroutine
622
623(F) You can't undefine a routine that's currently running. You can,
624however, redefine it while it's running, and you can even undef the
625redefined subroutine while the old routine is running. Go figure.
626
627=item Can't unshift
628
629(F) You tried to unshift an "unreal" array that can't be unshifted, such
630as the main Perl stack.
631
632=item Can't upgrade that kind of scalar
633
634(P) The internal sv_upgrade routine adds "members" to an SV, making
635it into a more specialized kind of SV. The top several SV types are
636so specialized, however, that they cannot be interconverted. This
637message indicates that such a conversion was attempted.
638
639=item Can't upgrade to undef
640
641(P) The undefined SV is the bottom of the totem pole, in the scheme
642of upgradability. Upgrading to undef indicates an error in the
643code calling sv_upgrade.
644
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645=item Can't use %s for loop variable
646
647(F) Only a simple scalar variable may be used as a loop variable on a foreach.
648
649=item Can't use %s ref as %s ref
650
651(F) You've mixed up your reference types. You have to dereference a
652reference of the type needed. You can use the ref() function to
653test the type of the reference, if need be.
654
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655=item Can't use \1 to mean $1 in expression
656
657(W) In an ordinary expression, backslash is a unary operator that creates
658a reference to its argument. The use of backslash to indicate a backreference
659to a matched substring is only valid as part of a regular expression pattern.
660Trying to do this in ordinary Perl code produces a value that prints
661out looking like SCALAR(0xdecaf). Use the $1 form instead.
662
663=item Can't use string ("%s") as %s ref while "strict refs" in use
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664
665(F) Only hard references are allowed by "strict refs". Symbolic references
666are disallowed. See L<perlref>.
667
668=item Can't use an undefined value as %s reference
669
670(F) A value used as either a hard reference or a symbolic reference must
671be a defined value. This helps to de-lurk some insidious errors.
672
673=item Can't use delimiter brackets within expression
674
675(F) The ${name} construct is for disambiguating identifiers in strings, not
676in ordinary code.
677
678=item Can't use global %s in "my"
679
680(F) You tried to declare a magical variable as a lexical variable. This is
681not allowed, because the magic can only be tied to one location (namely
682the global variable) and it would be incredibly confusing to have
683variables in your program that looked like magical variables but
684weren't.
685
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LW
686=item Can't use subscript on %s
687
688(F) The compiler tried to interpret a bracketed expression as a
689subscript. But to the left of the brackets was an expression that
690didn't look like an array reference, or anything else subscriptable.
691
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LW
692=item Can't write to temp file for B<-e>: %s
693
694(F) The write routine failed for some reason while trying to process
695a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
696
697=item Can't x= to readonly value
698
699(F) You tried to repeat a constant value (often the undefined value) with
700an assignment operator, which implies modifying the value itself.
701Perhaps you need to copy the value to a temporary, and repeat that.
702
703=item Cannot open temporary file
704
705(F) The create routine failed for some reaon while trying to process
706a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
707
708=item chmod: mode argument is missing initial 0
709
710(W) A novice will sometimes say
711
712 chmod 777, $filename
713
714not realizing that 777 will be interpreted as a decimal number, equivalent
715to 01411. Octal constants are introduced with a leading 0 in Perl, as in C.
716
717=item Close on unopened file <%s>
718
719(W) You tried to close a filehandle that was never opened.
720
721=item connect() on closed fd
722
723(W) You tried to do a connect on a closed socket. Did you forget to check
724the return value of your socket() call? See L<perlfunc/connect>.
725
726=item Corrupt malloc ptr 0x%lx at 0x%lx
727
728(P) The malloc package that comes with Perl had an internal failure.
729
730=item corrupted regexp pointers
731
732(P) The regular expression engine got confused by what the regular
733expression compiler gave it.
734
735=item corrupted regexp program
736
737(P) The regular expression engine got passed a regexp program without
738a valid magic number.
739
740=item Deep recursion on subroutine "%s"
741
742(W) This subroutine has called itself (directly or indirectly) 100
743times than it has returned. This probably indicates an infinite
744recursion, unless you're writing strange benchmark programs, in which
745case it indicates something else.
746
4633a7c4
LW
747=item Did you mean &%s instead?
748
749(W) You probably referred to an imported subroutine &FOO as $FOO or some such.
750
748a9306 751=item Did you mean $ or @ instead of %?
a0d0e21e 752
748a9306
LW
753(W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}.
754On the other hand, maybe you just meant %hash and got carried away.
755
756=item Do you need to predeclare %s?
757
758(S) This is an educated guess made in conjunction with the message "%s
759found where operator expected". It often means a subroutine or module
760name is being referenced that hasn't been declared yet. This may be
761because of ordering problems in your file, or because of a missing
762"sub", "package", "require", or "use" statement. If you're
763referencing something that isn't defined yet, you don't actually have
764to define the subroutine or package before the current location. You
765can use an empty "sub foo;" or "package FOO;" to enter a "forward"
766declaration.
a0d0e21e
LW
767
768=item Don't know how to handle magic of type '%s'
769
770(P) The internal handling of magical variables has been cursed.
771
772=item do_study: out of memory
773
774(P) This should have been caught by safemalloc() instead.
775
776=item Duplicate free() ignored
777
778(S) An internal routine called free() on something that had already
779been freed.
780
4633a7c4
LW
781=item elseif should be elsif
782
783(S) There is no keyword "elseif" in Perl because Larry thinks it's
784ugly. Your code will be interpreted as an attempt to call a method
785named "elseif" for the class returned by the following block. This is
786unlikely to be what you want.
787
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LW
788=item END failed--cleanup aborted
789
790(F) An untrapped exception was raised while executing an END subroutine.
791The interpreter is immediately exited.
792
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793=item Error converting file specification %s
794
795(F) An error peculiar to VMS. Since Perl may have to deal with file
796specifications in either VMS or Unix syntax, it converts them to a
797single form when it must operate on them directly. Either you've
798passed an invalid file specification to Perl, or you've found a
799case the conversion routines don't handle. Drat.
800
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LW
801=item Execution of %s aborted due to compilation errors.
802
803(F) The final summary message when a Perl compilation fails.
804
805=item Exiting eval via %s
806
807(W) You are exiting an eval by unconventional means, such as a
808a goto, or a loop control statement.
809
810=item Exiting subroutine via %s
811
812(W) You are exiting a subroutine by unconventional means, such as a
813a goto, or a loop control statement.
814
815=item Exiting substitution via %s
816
817(W) You are exiting a substitution by unconventional means, such as a
818a return, a goto, or a loop control statement.
819
748a9306 820=item Fatal VMS error at %s, line %d
a0d0e21e 821
748a9306
LW
822(P) An error peculiar to VMS. Something untoward happened in a VMS system
823service or RTL routine; Perl's exit status should provide more details. The
824filename in "at %s" and the line number in "line %d" tell you which section of
825the Perl source code is distressed.
a0d0e21e
LW
826
827=item fcntl is not implemented
828
829(F) Your machine apparently doesn't implement fcntl(). What is this, a
830PDP-11 or something?
831
832=item Filehandle %s never opened
833
834(W) An I/O operation was attempted on a filehandle that was never initialized.
835You need to do an open() or a socket() call, or call a constructor from
836the FileHandle package.
837
838=item Filehandle %s opened only for input
839
840(W) You tried to write on a read-only filehandle. If you
841intended it to be a read-write filehandle, you needed to open it with
842"+<" or "+>" or "+>>" instead of with "<" or nothing. If you only
843intended to write the file, use ">" or ">>". See L<perlfunc/open>.
844
845=item Filehandle only opened for input
846
847(W) You tried to write on a read-only filehandle. If you
848intended it to be a read-write filehandle, you needed to open it with
849"+<" or "+>" or "+>>" instead of with "<" or nothing. If you only
850intended to write the file, use ">" or ">>". See L<perlfunc/open>.
851
852=item Final $ should be \$ or $name
853
854(F) You must now decide whether the final $ in a string was meant to be
855a literal dollar sign, or was meant to introduce a variable name
856that happens to be missing. So you have to put either the backslash or
857the name.
858
859=item Final @ should be \@ or @name
860
861(F) You must now decide whether the final @ in a string was meant to be
862a literal "at" sign, or was meant to introduce a variable name
863that happens to be missing. So you have to put either the backslash or
864the name.
865
866=item Format %s redefined
867
868(W) You redefined a format. To suppress this warning, say
869
870 {
871 local $^W = 0;
872 eval "format NAME =...";
873 }
874
875=item Format not terminated
876
877(F) A format must be terminated by a line with a solitary dot. Perl got
878to the end of your file without finding such a line.
879
880=item Found = in conditional, should be ==
881
882(W) You said
883
884 if ($foo = 123)
885
886when you meant
887
888 if ($foo == 123)
889
890(or something like that).
891
892=item gdbm store returned %d, errno %d, key "%s"
893
894(S) A warning from the GDBM_File extension that a store failed.
895
896=item gethostent not implemented
897
898(F) Your C library apparently doesn't implement gethostent(), probably
899because if it did, it'd feel morally obligated to return every hostname
900on the Internet.
901
902=item get{sock,peer}name() on closed fd
903
904(W) You tried to get a socket or peer socket name on a closed socket.
905Did you forget to check the return value of your socket() call?
906
748a9306
LW
907=item getpwnam returned invalid UIC %#o for user "%s"
908
909(S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
910C<getpwnam> operator returned an invalid UIC.
911
912
a0d0e21e
LW
913=item Glob not terminated
914
915(F) The lexer saw a left angle bracket in a place where it was expecting
916a term, so it's looking for the corresponding right angle bracket, and not
917finding it. Chances are you left some needed parentheses out earlier in
918the line, and you really meant a "less than".
919
920=item Global symbol "%s" requires explicit package name
921
922(F) You've said "use strict vars", which indicates that all variables must
923either be lexically scoped (using "my"), or explicitly qualified to
924say which package the global variable is in (using "::").
925
926=item goto must have label
927
928(F) Unlike with "next" or "last", you're not allowed to goto an
929unspecified destination. See L<perlfunc/goto>.
930
931=item Had to create %s unexpectedly
932
933(S) A routine asked for a symbol from a symbol table that ought to have
934existed already, but for some reason it didn't, and had to be created on
935an emergency basis to prevent a core dump.
936
937=item Hash %%s missing the % in argument %d of %s()
938
939(D) Really old Perl let you omit the % on hash names in some spots. This
940is now heavily deprecated.
941
942=item Identifier "%s::%s" used only once: possible typo
943
944(W) Typographical errors often show up as unique identifiers. If you
945had a good reason for having a unique identifier, then just mention it
946again somehow to suppress the message.
947
948=item Illegal division by zero
949
950(F) You tried to divide a number by 0. Either something was wrong in your
951logic, or you need to put a conditional in to guard against meaningless input.
952
953=item Illegal modulus zero
954
955(F) You tried to divide a number by 0 to get the remainder. Most numbers
956don't take to this kindly.
957
958=item Illegal octal digit
959
960(F) You used an 8 or 9 in a octal number.
961
748a9306
LW
962=item Illegal octal digit ignored
963
964(W) You may have tried to use an 8 or 9 in a octal number. Interpretation
965of the octal number stopped before the 8 or 9.
966
a0d0e21e
LW
967=item Insecure dependency in %s
968
969(F) You tried to do something that the tainting mechanism didn't like.
970The tainting mechanism is turned on when you're running setuid or setgid,
971or when you specify B<-T> to turn it on explicitly. The tainting mechanism
972labels all data that's derived directly or indirectly from the user,
973who is considered to be unworthy of your trust. If any such data is
974used in a "dangerous" operation, you get this error. See L<perlsec>
975for more information.
976
977=item Insecure directory in %s
978
979(F) You can't use system(), exec(), or a piped open in a setuid or setgid
980script if $ENV{PATH} contains a directory that is writable by the world.
981See L<perlsec>.
982
983=item Insecure PATH
984
985(F) You can't use system(), exec(), or a piped open in a setuid or
986setgid script if $ENV{PATH} is derived from data supplied (or
987potentially supplied) by the user. The script must set the path to a
988known value, using trustworthy data. See L<perlsec>.
989
748a9306
LW
990=item Internal inconsistency in tracking vforks
991
992(S) A warning peculiar to VMS. Perl keeps track of the number
993of times you've called C<fork> and C<exec>, in order to determine
994whether the current call to C<exec> should be affect the current
995script or a subprocess (see L<perlvms/exec>). Somehow, this count
996has become scrambled, so Perl is making a guess and treating
997this C<exec> as a request to terminate the Perl script
998and execute the specified command.
999
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LW
1000=item internal disaster in regexp
1001
1002(P) Something went badly wrong in the regular expression parser.
1003
1004=item internal urp in regexp at /%s/
1005
1006(P) Something went badly awry in the regular expression parser.
1007
1008=item invalid [] range in regexp
1009
1010(F) The range specified in a character class had a minimum character
1011greater than the maximum character. See L<perlre>.
1012
1013=item ioctl is not implemented
1014
1015(F) Your machine apparently doesn't implement ioctl(), which is pretty
1016strange for a machine that supports C.
1017
1018=item junk on end of regexp
1019
1020(P) The regular expression parser is confused.
1021
1022=item Label not found for "last %s"
1023
1024(F) You named a loop to break out of, but you're not currently in a
1025loop of that name, not even if you count where you were called from.
1026See L<perlfunc/last>.
1027
1028=item Label not found for "next %s"
1029
1030(F) You named a loop to continue, but you're not currently in a loop of
1031that name, not even if you count where you were called from. See
1032L<perlfunc/last>.
1033
1034=item Label not found for "redo %s"
1035
1036(F) You named a loop to restart, but you're not currently in a loop of
1037that name, not even if you count where you were called from. See
1038L<perlfunc/last>.
1039
1040=item listen() on closed fd
1041
1042(W) You tried to do a listen on a closed socket. Did you forget to check
1043the return value of your socket() call? See L<perlfunc/listen>.
1044
1045=item Literal @%s now requires backslash
1046
1047(F) It used to be that Perl would try to guess whether you wanted an
1048array interpolated or a literal @. It did this when the string was
1049first used at runtime. Now strings are parsed at compile time, and
1050ambiguous instances of @ must be disambiguated, either by putting a
1051backslash to indicate a literal, or by declaring (or using) the array
1052within the program before the string (lexically). (Someday it will simply
1053assume that an unbackslashed @ interpolates an array.)
1054
1055=item Method for operation %s not found in package %s during blessing
1056
1057(F) An attempt was made to specify an entry in an overloading table that
1058doesn't somehow point to a valid method. See L<perlovl>.
1059
1060=item Might be a runaway multi-line %s string starting on line %d
1061
1062(S) An advisory indicating that the previous error may have been caused
1063by a missing delimiter on a string or pattern, because it eventually
1064ended earlier on the current line.
1065
1066=item Misplaced _ in number
1067
1068(W) An underline in a decimal constant wasn't on a 3-digit boundary.
1069
1070=item Missing $ on loop variable
1071
1072(F) Apparently you've been programming in csh too much. Variables are always
1073mentioned with the $ in Perl, unlike in the shells, where it can vary from
1074one line to the next.
1075
1076=item Missing comma after first argument to %s function
1077
1078(F) While certain functions allow you to specify a filehandle or an
1079"indirect object" before the argument list, this ain't one of them.
1080
748a9306
LW
1081=item Missing operator before %s?
1082
1083(S) This is an educated guess made in conjunction with the message "%s
1084found where operator expected". Often the missing operator is a comma.
1085
a0d0e21e
LW
1086=item Missing right bracket
1087
1088(F) The lexer counted more opening curly brackets (braces) than closing ones.
1089As a general rule, you'll find it's missing near the place you were last
1090editing.
1091
1092=item Missing semicolon on previous line?
1093
1094(S) This is an educated guess made in conjunction with the message "%s
1095found where operator expected". Don't automatically put a semicolon on
1096the previous line just because you saw this message.
1097
1098=item Modification of a read-only value attempted
1099
1100(F) You tried, directly or indirectly, to change the value of a
1101constant. You didn't, of course, try "2 = 1", since the compiler
1102catches that. But an easy way to do the same thing is:
1103
1104 sub mod { $_[0] = 1 }
1105 mod(2);
1106
1107Another way is to assign to a substr() that's off the end of the string.
1108
1109=item Modification of non-creatable array value attempted, subscript %d
1110
1111(F) You tried to make an array value spring into existence, and the
1112subscript was probably negative, even counting from end of the array
1113backwards.
1114
1115=item Modification of non-creatable hash value attempted, subscript "%s"
1116
1117(F) You tried to make a hash value spring into existence, and it couldn't
1118be created for some peculiar reason.
1119
1120=item Module name must be constant
1121
1122(F) Only a bare module name is allowed as the first argument to a "use".
1123
1124=item msg%s not implemented
1125
1126(F) You don't have System V message IPC on your system.
1127
1128=item Multidimensional syntax %s not supported
1129
1130(W) Multidimensional arrays aren't written like $foo[1,2,3]. They're written
1131like $foo[1][2][3], as in C.
1132
1133=item Negative length
1134
1135(F) You tried to do a read/write/send/recv operation with a buffer length
1136that is less than 0. This is difficult to imagine.
1137
1138=item nested *?+ in regexp
1139
1140(F) You can't quantify a quantifier without intervening parens. So
1141things like ** or +* or ?* are illegal.
1142
1143Note, however, that the minimal matching quantifiers, *?, +? and ?? appear
1144to be nested quantifiers, but aren't. See L<perlre>.
1145
1146=item No #! line
1147
1148(F) The setuid emulator requires that scripts have a well-formed #! line
1149even on machines that don't support the #! construct.
1150
1151=item No %s allowed while running setuid
1152
1153(F) Certain operations are deemed to be too insecure for a setuid or setgid
1154script to even be allowed to attempt. Generally speaking there will be
1155another way to do what you want that is, if not secure, at least securable.
1156See L<perlsec>.
1157
1158=item No B<-e> allowed in setuid scripts
1159
1160(F) A setuid script can't be specified by the user.
1161
1162=item No comma allowed after %s
1163
1164(F) A list operator that has a filehandle or "indirect object" is not
1165allowed to have a comma between that and the following arguments.
1166Otherwise it'd be just another one of the arguments.
1167
748a9306
LW
1168=item No command into which to pipe on command line
1169
1170(F) An error peculiar to VMS. Perl handles its own command line redirection,
1171and found a '|' at the end of the command line, so it doesn't know whither you
1172want to pipe the output from this command.
1173
a0d0e21e
LW
1174=item No DB::DB routine defined
1175
1176(F) The currently executing code was compiled with the B<-d> switch,
1177but for some reason the perl5db.pl file (or some facsimile thereof)
1178didn't define a routine to be called at the beginning of each
1179statement. Which is odd, because the file should have been required
1180automatically, and should have blown up the require if it didn't parse
1181right.
1182
1183=item No dbm on this machine
1184
1185(P) This is counted as an internal error, because every machine should
1186supply dbm nowadays, since Perl comes with SDBM. See L<SDBM_File>.
1187
1188=item No DBsub routine
1189
1190(F) The currently executing code was compiled with the B<-d> switch,
1191but for some reason the perl5db.pl file (or some facsimile thereof)
1192didn't define a DB::sub routine to be called at the beginning of each
1193ordinary subroutine call.
1194
748a9306
LW
1195=item No error file after 2> or 2>> on command line
1196
1197(F) An error peculiar to VMS. Perl handles its own command line redirection,
1198and found a '2>' or a '2>>' on the command line, but can't find the name of the
1199file to which to write data destined for stderr.
1200
1201=item No input file after < on command line
1202
1203(F) An error peculiar to VMS. Perl handles its own command line redirection,
1204and found a '<' on the command line, but can't find the name of the file from
1205which to read data for stdin.
1206
1207=item No output file after > on command line
1208
1209(F) An error peculiar to VMS. Perl handles its own command line redirection,
1210and found a lone '>' at the end of the command line, so it doesn't know whither
1211you wanted to redirect stdout.
1212
1213=item No output file after > or >> on command line
1214
1215(F) An error peculiar to VMS. Perl handles its own command line redirection,
1216and found a '>' or a '>>' on the command line, but can't find the name of the
1217file to which to write data destined for stdout.
1218
a0d0e21e
LW
1219=item No Perl script found in input
1220
1221(F) You called C<perl -x>, but no line was found in the file beginning
1222with #! and containing the word "perl".
1223
1224=item No setregid available
1225
1226(F) Configure didn't find anything resembling the setregid() call for
1227your system.
1228
1229=item No setreuid available
1230
1231(F) Configure didn't find anything resembling the setreuid() call for
1232your system.
1233
1234=item No space allowed after B<-I>
1235
1236(F) The argument to B<-I> must follow the B<-I> immediately with no
1237intervening space.
1238
748a9306
LW
1239=item No such pipe open
1240
1241(P) An error peculiar to VMS. The internal routine my_pclose() tried to
1242close a pipe which hadn't been opened. This should have been caught earlier as
1243an attempt to close an unopened filehandle.
1244
a0d0e21e
LW
1245=item No such signal: SIG%s
1246
1247(W) You specified a signal name as a subscript to %SIG that was not recognized.
1248Say C<kill -l> in your shell to see the valid signal names on your system.
1249
1250=item Not a CODE reference
1251
1252(F) Perl was trying to evaluate a reference to a code value (that is, a
1253subroutine), but found a reference to something else instead. You can
1254use the ref() function to find out what kind of ref it really was.
1255See also L<perlref>.
1256
1257=item Not a format reference
1258
1259(F) I'm not sure how you managed to generate a reference to an anonymous
1260format, but this indicates you did, and that it didn't exist.
1261
1262=item Not a GLOB reference
1263
1264(F) Perl was trying to evaluate a reference to a "type glob" (that is,
1265a symbol table entry that looks like C<*foo>), but found a reference to
1266something else instead. You can use the ref() function to find out
1267what kind of ref it really was. See L<perlref>.
1268
1269=item Not a HASH reference
1270
1271(F) Perl was trying to evaluate a reference to a hash value, but
1272found a reference to something else instead. You can use the ref()
1273function to find out what kind of ref it really was. See L<perlref>.
1274
1275=item Not a perl script
1276
1277(F) The setuid emulator requires that scripts have a well-formed #! line
1278even on machines that don't support the #! construct. The line must
1279mention perl.
1280
1281=item Not a SCALAR reference
1282
1283(F) Perl was trying to evaluate a reference to a scalar value, but
1284found a reference to something else instead. You can use the ref()
1285function to find out what kind of ref it really was. See L<perlref>.
1286
1287=item Not a subroutine reference
1288
1289(F) Perl was trying to evaluate a reference to a code value (that is, a
1290subroutine), but found a reference to something else instead. You can
1291use the ref() function to find out what kind of ref it really was.
1292See also L<perlref>.
1293
1294=item Not a subroutine reference in %OVERLOAD
1295
1296(F) An attempt was made to specify an entry in an overloading table that
1297doesn't somehow point to a valid subroutine. See L<perlovl>.
1298
1299=item Not an ARRAY reference
1300
1301(F) Perl was trying to evaluate a reference to an array value, but
1302found a reference to something else instead. You can use the ref()
1303function to find out what kind of ref it really was. See L<perlref>.
1304
1305=item Not enough arguments for %s
1306
1307(F) The function requires more arguments than you specified.
1308
1309=item Not enough format arguments
1310
1311(W) A format specified more picture fields than the next line supplied.
1312See L<perlform>.
1313
1314=item Null filename used
1315
1316(F) You can't require the null filename, especially since on many machines
1317that means the current directory! See L<perlfunc/require>.
1318
1319=item NULL OP IN RUN
1320
1321(P) Some internal routine called run() with a null opcode pointer.
1322
1323=item Null realloc
1324
1325(P) An attempt was made to realloc NULL.
1326
1327=item NULL regexp argument
1328
1329(P) The internal pattern matching routines blew it bigtime.
1330
1331=item NULL regexp parameter
1332
1333(P) The internal pattern matching routines are out of their gourd.
1334
1335=item Odd number of elements in hash list
1336
1337(S) You specified an odd number of elements to a hash list, which is odd,
1338since hash lists come in key/value pairs.
1339
1340=item oops: oopsAV
1341
1342(S) An internal warning that the grammar is screwed up.
1343
1344=item oops: oopsHV
1345
1346(S) An internal warning that the grammar is screwed up.
1347
1348=item Operation `%s' %s: no method found,
1349
1350(F) An attempt was made to use an entry in an overloading table that
1351somehow no longer points to a valid method. See L<perlovl>.
1352
748a9306
LW
1353=item Operator or semicolon missing before %s
1354
1355(S) You used a variable or subroutine call where the parser was
1356expecting an operator. The parser has assumed you really meant
1357to use an operator, but this is highly likely to be incorrect.
1358For example, if you say "*foo *foo" it will be interpreted as
1359if you said "*foo * 'foo'".
1360
a0d0e21e
LW
1361=item Out of memory for yacc stack
1362
1363(F) The yacc parser wanted to grow its stack so it could continue parsing,
1364but realloc() wouldn't give it more memory, virtual or otherwise.
1365
1366=item Out of memory!
1367
1368(X) The malloc() function returned 0, indicating there was insufficient
1369remaining memory (or virtual memory) to satisfy the request.
1370
1371=item page overflow
1372
1373(W) A single call to write() produced more lines than can fit on a page.
1374See L<perlform>.
1375
1376=item panic: ck_grep
1377
1378(P) Failed an internal consistency check trying to compile a grep.
1379
1380=item panic: ck_split
1381
1382(P) Failed an internal consistency check trying to compile a split.
1383
1384=item panic: corrupt saved stack index
1385
1386(P) The savestack was requested to restore more localized values than there
1387are in the savestack.
1388
1389=item panic: die %s
1390
1391(P) We popped the context stack to an eval context, and then discovered
1392it wasn't an eval context.
1393
1394=item panic: do_match
1395
1396(P) The internal pp_match() routine was called with invalid operational data.
1397
1398=item panic: do_split
1399
1400(P) Something terrible went wrong in setting up for the split.
1401
1402=item panic: do_subst
1403
1404(P) The internal pp_subst() routine was called with invalid operational data.
1405
1406=item panic: do_trans
1407
1408(P) The internal do_trans() routine was called with invalid operational data.
1409
1410=item panic: goto
1411
1412(P) We popped the context stack to a context with the specified label,
1413and then discovered it wasn't a context we know how to do a goto in.
1414
1415=item panic: INTERPCASEMOD
1416
1417(P) The lexer got into a bad state at a case modifier.
1418
1419=item panic: INTERPCONCAT
1420
1421(P) The lexer got into a bad state parsing a string with brackets.
1422
1423=item panic: last
1424
1425(P) We popped the context stack to a block context, and then discovered
1426it wasn't a block context.
1427
1428=item panic: leave_scope clearsv
1429
1430(P) A writable lexical variable became readonly somehow within the scope.
1431
1432=item panic: leave_scope inconsistency
1433
1434(P) The savestack probably got out of sync. At least, there was an
1435invalid enum on the top of it.
1436
1437=item panic: malloc
1438
1439(P) Something requested a negative number of bytes of malloc.
1440
1441=item panic: mapstart
1442
1443(P) The compiler is screwed up with respect to the map() function.
1444
1445=item panic: null array
1446
1447(P) One of the internal array routines was passed a null AV pointer.
1448
1449=item panic: pad_alloc
1450
1451(P) The compiler got confused about which scratch pad it was allocating
1452and freeing temporaries and lexicals from.
1453
1454=item panic: pad_free curpad
1455
1456(P) The compiler got confused about which scratch pad it was allocating
1457and freeing temporaries and lexicals from.
1458
1459=item panic: pad_free po
1460
1461(P) An invalid scratch pad offset was detected internally.
1462
1463=item panic: pad_reset curpad
1464
1465(P) The compiler got confused about which scratch pad it was allocating
1466and freeing temporaries and lexicals from.
1467
1468=item panic: pad_sv po
1469
1470(P) An invalid scratch pad offset was detected internally.
1471
1472=item panic: pad_swipe curpad
1473
1474(P) The compiler got confused about which scratch pad it was allocating
1475and freeing temporaries and lexicals from.
1476
1477=item panic: pad_swipe po
1478
1479(P) An invalid scratch pad offset was detected internally.
1480
1481=item panic: pp_iter
1482
1483(P) The foreach iterator got called in a non-loop context frame.
1484
1485=item panic: realloc
1486
1487(P) Something requested a negative number of bytes of realloc.
1488
1489=item panic: restartop
1490
1491(P) Some internal routine requested a goto (or something like it), and
1492didn't supply the destination.
1493
1494=item panic: return
1495
1496(P) We popped the context stack to a subroutine or eval context, and
1497then discovered it wasn't a subroutine or eval context.
1498
1499=item panic: scan_num
1500
1501(P) scan_num() got called on something that wasn't a number.
1502
1503=item panic: sv_insert
1504
1505(P) The sv_insert() routine was told to remove more string than there
1506was string.
1507
1508=item panic: top_env
1509
1510(P) The compiler attempted to do a goto, or something weird like that.
1511
1512=item panic: yylex
1513
1514(P) The lexer got into a bad state while processing a case modifier.
1515
1516=item Parens missing around "%s" list
1517
1518(W) You said something like
1519
1520 my $foo, $bar = @_;
1521
1522when you meant
1523
1524 my ($foo, $bar) = @_;
1525
1526Remember that "my" and "local" bind closer than comma.
1527
1528=item Perl %3.3f required--this is only version %s, stopped
1529
1530(F) The module in question uses features of a version of Perl more recent
1531than the currently running version. How long has it been since you upgraded,
1532anyway? See L<perlfunc/require>.
1533
1534=item Permission denied
1535
1536(F) The setuid emulator in suidperl decided you were up to no good.
1537
748a9306
LW
1538=item pid %d not a child
1539
1540(W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which
1541isn't a subprocess of the current process. While this is fine from VMS'
1542perspective, it's probably not what you intended.
1543
a0d0e21e
LW
1544=item POSIX getpgrp can't take an argument
1545
1546(F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike
1547the BSD version, which takes a pid.
1548
1549=item Possible memory corruption: %s overflowed 3rd argument
1550
1551(F) An ioctl() or fcntl() returned more than Perl was bargaining for.
1552Perl guesses a reasonable buffer size, but puts a sentinel byte at the
1553end of the buffer just in case. This sentinel byte got clobbered, and
1554Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
1555
1556=item Precedence problem: open %s should be open(%s)
1557
1558(S) The old irregular construct
1559
1560 open FOO || die;
1561
1562is now misinterpreted as
1563
1564 open(FOO || die);
1565
1566because of the strict regularization of Perl 5's grammar into unary and
1567list operators. (The old open was a little of both.) You must put
1568parens around the filehandle, or use the new "or" operator instead of "||".
1569
1570=item print on closed filehandle %s
1571
1572(W) The filehandle you're printing on got itself closed sometime before now.
1573Check your logic flow.
1574
1575=item printf on closed filehandle %s
1576
1577(W) The filehandle you're writing to got itself closed sometime before now.
1578Check your logic flow.
1579
1580=item Probable precedence problem on %s
1581
1582(W) The compiler found a bare word where it expected a conditional,
1583which often indicates that an || or && was parsed as part of the
1584last argument of the previous construct, for example:
1585
1586 open FOO || die;
1587
4633a7c4
LW
1588=item Prototype mismatch: (%s) vs (%s)
1589
1590(S) The subroutine being defined had a predeclared (forward) declaration
1591with a different function prototype.
1592
a0d0e21e
LW
1593=item Read on closed filehandle <%s>
1594
1595(W) The filehandle you're reading from got itself closed sometime before now.
1596Check your logic flow.
1597
1598=item Reallocation too large: %lx
1599
1600(F) You can't allocate more than 64K on an MSDOS machine.
1601
1602=item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
1603
1604(F) You can't use the B<-D> option unless the code to produce the
1605desired output is compiled into Perl, which entails some overhead,
1606which is why it's currently left out of your copy.
1607
1608=item Recursive inheritance detected
1609
1610(F) More than 100 levels of inheritance were used. Probably indicates
1611an unintended loop in your inheritance hierarchy.
1612
1613=item Reference miscount in sv_replace()
1614
1615(W) The internal sv_replace() function was handed a new SV with a
1616reference count of other than 1.
1617
1618=item regexp memory corruption
1619
1620(P) The regular expression engine got confused by what the regular
1621expression compiler gave it.
1622
1623=item regexp out of space
1624
1625(P) A "can't happen" error, because safemalloc() should have caught it earlier.
1626
1627=item regexp too big
1628
1629(F) The current implementation of regular expression uses shorts as
1630address offsets within a string. Unfortunately this means that if
1631the regular expression compiles to longer than 32767, it'll blow up.
1632Usually when you want a regular expression this big, there is a better
1633way to do it with multiple statements. See L<perlre>.
1634
1635=item Reversed %s= operator
1636
1637(W) You wrote your assignment operator backwards. The = must always
1638comes last, to avoid ambiguity with subsequent unary operators.
1639
1640=item Runaway format
1641
1642(F) Your format contained the ~~ repeat-until-blank sequence, but it
1643produced 200 lines at once, and the 200th line looked exactly like the
1644199th line. Apparently you didn't arrange for the arguments to exhaust
1645themselves, either by using ^ instead of @ (for scalar variables), or by
1646shifting or popping (for array variables). See L<perlform>.
1647
1648=item Scalar value @%s[%s] better written as $%s[%s]
1649
1650(W) You've used an array slice (indicated by @) to select a single value of
1651an array. Generally it's better to ask for a scalar value (indicated by $).
1652The difference is that $foo[&bar] always behaves like a scalar, both when
1653assigning to it and when evaluating its argument, while @foo[&bar] behaves
1654like a list when you assign to it, and provides a list context to its
1655subscript, which can do weird things if you're only expecting one subscript.
1656
748a9306
LW
1657On the other hand, if you were actually hoping to treat the array
1658element as a list, you need to look into how references work, since
1659Perl will not magically convert between scalars and lists for you. See
1660L<perlref>.
1661
a0d0e21e
LW
1662=item Script is not setuid/setgid in suidperl
1663
1664(F) Oddly, the suidperl program was invoked on a script with its setuid
1665or setgid bit set. This doesn't make much sense.
1666
1667=item Search pattern not terminated
1668
1669(F) The lexer couldn't find the final delimiter of a // or m{}
1670construct. Remember that bracketing delimiters count nesting level.
1671
1672=item seek() on unopened file
1673
1674(W) You tried to use the seek() function on a filehandle that was either
1675never opened or has been closed since.
1676
1677=item select not implemented
1678
1679(F) This machine doesn't implement the select() system call.
1680
1681=item sem%s not implemented
1682
1683(F) You don't have System V semaphore IPC on your system.
1684
1685=item semi-panic: attempt to dup freed string
1686
1687(S) The internal newSVsv() routine was called to duplicate a scalar
1688that had previously been marked as free.
1689
1690=item Semicolon seems to be missing
1691
1692(W) A nearby syntax error was probably caused by a missing semicolon,
1693or possibly some other missing operator, such as a comma.
1694
1695=item Send on closed socket
1696
1697(W) The filehandle you're sending to got itself closed sometime before now.
1698Check your logic flow.
1699
1700=item Sequence (?#... not terminated
1701
1702(F) A regular expression comment must be terminated by a closing
1703parenthesis. Embedded parens aren't allowed. See L<perlre>.
1704
1705=item Sequence (?%s...) not implemented
1706
1707(F) A proposed regular expression extension has the character reserved
1708but has not yet been written. See L<perlre>.
1709
1710=item Sequence (?%s...) not recognized
1711
1712(F) You used a regular expression extension that doesn't make sense.
1713See L<perlre>.
1714
1715=item setegid() not implemented
1716
1717(F) You tried to assign to $), and your operating system doesn't support
1718the setegid() system call (or equivalent), or at least Configure didn't
1719think so.
1720
1721=item seteuid() not implemented
1722
1723(F) You tried to assign to $>, and your operating system doesn't support
1724the seteuid() system call (or equivalent), or at least Configure didn't
1725think so.
1726
1727=item setrgid() not implemented
1728
1729(F) You tried to assign to $(, and your operating system doesn't support
1730the setrgid() system call (or equivalent), or at least Configure didn't
1731think so.
1732
1733=item setruid() not implemented
1734
1735(F) You tried to assign to $<, and your operating system doesn't support
1736the setruid() system call (or equivalent), or at least Configure didn't
1737think so.
1738
1739=item Setuid/gid script is writable by world
1740
1741(F) The setuid emulator won't run a script that is writable by the world,
1742because the world might have written on it already.
1743
1744=item shm%s not implemented
1745
1746(F) You don't have System V shared memory IPC on your system.
1747
1748=item shutdown() on closed fd
1749
1750(W) You tried to do a shutdown on a closed socket. Seems a bit superfluous.
1751
1752=item SIG%s handler "%s" not defined.
1753
1754(W) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you
1755put it into the wrong package?
1756
1757=item sort is now a reserved word
1758
1759(F) An ancient error message that almost nobody ever runs into anymore.
1760But before sort was a keyword, people sometimes used it as a filehandle.
1761
1762=item Sort subroutine didn't return a numeric value
1763
1764(F) A sort comparison routine must return a number. You probably blew
4633a7c4 1765it by not using C<E<lt>=E<gt>> or C<cmp>, or by not using them correctly.
a0d0e21e
LW
1766See L<perlfunc/sort>.
1767
1768=item Sort subroutine didn't return single value
1769
1770(F) A sort comparison subroutine may not return a list value with more
1771or less than one element. See L<perlfunc/sort>.
1772
1773=item Split loop
1774
1775(P) The split was looping infinitely. (Obviously, a split shouldn't iterate
1776more times than there are characters of input, which is what happened.)
1777See L<perlfunc/split>.
1778
1779=item Stat on unopened file <%s>
1780
1781(W) You tried to use the stat() function (or an equivalent file test)
1782on a filehandle that was either never opened or has been closed since.
1783
1784=item Statement unlikely to be reached
1785
1786(W) You did an exec() with some statement after it other than a die().
1787This is almost always an error, because exec() never returns unless
1788there was a failure. You probably wanted to use system() instead,
1789which does return. To suppress this warning, put the exec() in a block
1790by itself.
1791
1792=item Subroutine %s redefined
1793
1794(W) You redefined a subroutine. To suppress this warning, say
1795
1796 {
1797 local $^W = 0;
1798 eval "sub name { ... }";
1799 }
1800
1801=item Substitution loop
1802
1803(P) The substitution was looping infinitely. (Obviously, a
1804substitution shouldn't iterate more times than there are characters of
1805input, which is what happened.) See the discussion of substitution in
1806L<perlop/"Quote and Quotelike Operators">.
1807
1808=item Substitution pattern not terminated
1809
1810(F) The lexer couldn't find the interior delimiter of a s/// or s{}{}
1811construct. Remember that bracketing delimiters count nesting level.
1812
1813=item Substitution replacement not terminated
1814
1815(F) The lexer couldn't find the final delimiter of a s/// or s{}{}
1816construct. Remember that bracketing delimiters count nesting level.
1817
1818=item substr outside of string
1819
1820(W) You tried to reference a substr() that pointed outside of a string.
1821That is, the absolute value of the offset was larger than the length of
1822the string. See L<perlfunc/substr>.
1823
1824=item suidperl is no longer needed since...
1825
1826(F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but a
1827version of the setuid emulator somehow got run anyway.
1828
1829=item syntax error
1830
1831(F) Probably means you had a syntax error. Common reasons include:
1832
1833 A keyword is misspelled.
1834 A semicolon is missing.
1835 A comma is missing.
1836 An opening or closing parenthesis is missing.
1837 An opening or closing brace is missing.
1838 A closing quote is missing.
1839
1840Often there will be another error message associated with the syntax
1841error giving more information. (Sometimes it helps to turn on B<-w>.)
1842The error message itself often tells you where it was in the line when
1843it decided to give up. Sometimes the actual error is several tokens
1844before this, since Perl is good at understanding random input.
1845Occasionally the line number may be misleading, and once in a blue moon
1846the only way to figure out what's triggering the error is to call
1847C<perl -c> repeatedly, chopping away half the program each time to see
1848if the error went away. Sort of the cybernetic version of S<20 questions>.
1849
1850=item System V IPC is not implemented on this machine
1851
1852(F) You tried to do something with a function beginning with "sem", "shm"
1853or "msg". See L<perlfunc/semctl>, for example.
1854
1855=item Syswrite on closed filehandle
1856
1857(W) The filehandle you're writing to got itself closed sometime before now.
1858Check your logic flow.
1859
1860=item tell() on unopened file
1861
1862(W) You tried to use the tell() function on a filehandle that was either
1863never opened or has been closed since.
1864
1865=item Test on unopened file <%s>
1866
1867(W) You tried to invoke a file test operator on a filehandle that isn't
1868open. Check your logic. See also L<perlfunc/-X>.
1869
1870=item That use of $[ is unsupported
1871
1872(F) Assignment to $[ is now strictly circumscribed, and interpreted as
1873a compiler directive. You may only say one of
1874
1875 $[ = 0;
1876 $[ = 1;
1877 ...
1878 local $[ = 0;
1879 local $[ = 1;
1880 ...
1881
1882This is to prevent the problem of one module changing the array base
1883out from under another module inadvertently. See L<perlvar/$[>.
1884
1885=item The %s function is unimplemented
1886
1887The function indicated isn't implemented on this architecture, according
1888to the probings of Configure.
1889
1890=item The crypt() function is unimplemented due to excessive paranoia.
1891
1892(F) Configure couldn't find the crypt() function on your machine,
1893probably because your vendor didn't supply it, probably because they
1894think the U.S. Govermnment thinks it's a secret, or at least that they
1895will continue to pretend that it is. And if you quote me on that, I
1896will deny it.
1897
1898=item The stat preceding C<-l _> wasn't an lstat
1899
1900(F) It makes no sense to test the current stat buffer for symbolic linkhood
1901if the last stat that wrote to the stat buffer already went past
1902the symlink to get to the real file. Use an actual filename instead.
1903
1904=item times not implemented
1905
1906(F) Your version of the C library apparently doesn't do times(). I suspect
1907you're not running on Unix.
1908
1909=item Too few args to syscall
1910
1911(F) There has to be at least one argument to syscall() to specify the
1912system call to call, silly dilly.
1913
1914=item Too many args to syscall
1915
1916(F) Perl only supports a maximum of 14 args to syscall().
1917
1918=item Too many arguments for %s
1919
1920(F) The function requires fewer arguments than you specified.
1921
1922=item trailing \ in regexp
1923
1924(F) The regular expression ends with an unbackslashed backslash. Backslash
1925it. See L<perlre>.
1926
1927=item Translation pattern not terminated
1928
1929(F) The lexer couldn't find the interior delimiter of a tr/// or tr[][]
1930construct.
1931
1932=item Translation replacement not terminated
1933
1934(F) The lexer couldn't find the final delimiter of a tr/// or tr[][]
1935construct.
1936
1937=item truncate not implemented
1938
1939(F) Your machine doesn't implement a file truncation mechanism that
1940Configure knows about.
1941
1942=item Type of arg %d to %s must be %s (not %s)
1943
1944(F) This function requires the argument in that position to be of a
1945certain type. Arrays must be @NAME or @{EXPR}. Hashes must be
1946%NAME or %{EXPR}. No implicit dereferencing is allowed--use the
1947{EXPR} forms as an explicit dereference. See L<perlref>.
1948
1949=item umask: argument is missing initial 0
1950
1951(W) A umask of 222 is incorrect. It should be 0222, since octal literals
1952always start with 0 in Perl, as in C.
1953
4633a7c4
LW
1954=item Unable to create sub named "%s"
1955
1956(F) You attempted to create or access a subroutine with an illegal name.
1957
a0d0e21e
LW
1958=item Unbalanced context: %d more PUSHes than POPs
1959
1960(W) The exit code detected an internal inconsistency in how many execution
1961contexts were entered and left.
1962
1963=item Unbalanced saves: %d more saves than restores
1964
1965(W) The exit code detected an internal inconsistency in how many
1966values were temporarily localized.
1967
1968=item Unbalanced scopes: %d more ENTERs than LEAVEs
1969
1970(W) The exit code detected an internal inconsistency in how many blocks
1971were entered and left.
1972
1973=item Unbalanced tmps: %d more allocs than frees
1974
1975(W) The exit code detected an internal inconsistency in how many mortal
1976scalars were allocated and freed.
1977
1978=item Undefined format "%s" called
1979
1980(F) The format indicated doesn't seem to exist. Perhaps it's really in
1981another package? See L<perlform>.
1982
1983=item Undefined sort subroutine "%s" called
1984
1985(F) The sort comparison routine specified doesn't seem to exist. Perhaps
1986it's in a different package? See L<perlfunc/sort>.
1987
1988=item Undefined subroutine &%s called
1989
1990(F) The subroutine indicated hasn't been defined, or if it was, it
1991has since been undefined.
1992
1993=item Undefined subroutine called
1994
1995(F) The anonymous subroutine you're trying to call hasn't been defined,
1996or if it was, it has since been undefined.
1997
1998=item Undefined subroutine in sort
1999
2000(F) The sort comparison routine specified is declared but doesn't seem to
2001have been defined yet. See L<perlfunc/sort>.
2002
4633a7c4
LW
2003=item Undefined top format "%s" called
2004
2005(F) The format indicated doesn't seem to exist. Perhaps it's really in
2006another package? See L<perlform>.
2007
a0d0e21e
LW
2008=item unexec of %s into %s failed!
2009
2010(F) The unexec() routine failed for some reason. See your local FSF
2011representative, who probably put it there in the first place.
2012
2013=item Unknown BYTEORDER
2014
2015(F) There are no byteswapping functions for a machine with this byte order.
2016
2017=item unmatched () in regexp
2018
2019(F) Unbackslashed parentheses must always be balanced in regular
2020expressions. If you're a vi user, the % key is valuable for finding
2021the matching paren. See L<perlre>.
2022
2023=item Unmatched right bracket
2024
2025(F) The lexer counted more closing curly brackets (braces) than opening
2026ones, so you're probably missing an opening bracket. As a general
2027rule, you'll find the missing one (so to speak) near the place you were
2028last editing.
2029
2030=item unmatched [] in regexp
2031
2032(F) The brackets around a character class must match. If you wish to
2033include a closing bracket in a character class, backslash it or put it first.
2034See L<perlre>.
2035
2036=item Unquoted string "%s" may clash with future reserved word
2037
2038(W) You used a bare word that might someday be claimed as a reserved word.
2039It's best to put such a word in quotes, or capitalize it somehow, or insert
2040an underbar into it. You might also declare it as a subroutine.
2041
2042=item Unrecognized character \%03o ignored
2043
2044(S) A garbage character was found in the input, and ignored, in case it's
2045a weird control character on an EBCDIC machine, or some such.
2046
2047=item Unrecognized signal name "%s"
2048
2049(F) You specified a signal name to the kill() function that was not recognized.
2050Say C<kill -l> in your shell to see the valid signal names on your system.
2051
2052=item Unrecognized switch: -%s
2053
2054(F) You specified an illegal option to Perl. Don't do that.
2055(If you think you didn't do that, check the #! line to see if it's
2056supplying the bad switch on your behalf.)
2057
2058=item Unsuccessful %s on filename containing newline
2059
2060(W) A file operation was attempted on a filename, and that operation
2061failed, PROBABLY because the filename contained a newline, PROBABLY
2062because you forgot to chop() or chomp() it off. See L<perlfunc/chop>.
2063
2064=item Unsupported directory function "%s" called
2065
2066(F) Your machine doesn't support opendir() and readdir().
2067
2068=item Unsupported function %s
2069
2070(F) This machines doesn't implement the indicated function, apparently.
2071At least, Configure doesn't think so.
2072
2073=item Unsupported socket function "%s" called
2074
2075(F) Your machine doesn't support the Berkeley socket mechanism, or at
2076least that's what Configure thought.
2077
2078=item Unterminated <> operator
2079
2080(F) The lexer saw a left angle bracket in a place where it was expecting
2081a term, so it's looking for the corresponding right angle bracket, and not
2082finding it. Chances are you left some needed parentheses out earlier in
2083the line, and you really meant a "less than".
2084
2085=item Use of $# is deprecated
2086
2087(D) This was an ill-advised attempt to emulate a poorly defined awk feature.
2088Use an explicit printf() or sprintf() instead.
2089
2090=item Use of $* is deprecated
2091
2092(D) This variable magically turned on multiline pattern matching, both for
2093you and for any luckless subroutine that you happen to call. You should
2094use the new C<//m> and C<//s> modifiers now to do that without the dangerous
2095action-at-a-distance effects of C<$*>.
2096
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2097=item Use of %s in printf format not supported
2098
2099(F) You attempted to use a feature of printf that is accessible only
2100from C. This usually means there's a better way to do it in Perl.
2101
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2102=item Use of %s is deprecated
2103
2104(D) The construct indicated is no longer recommended for use, generally
2105because there's a better way to do it, and also because the old way has
2106bad side effects.
2107
4633a7c4
LW
2108=item Use of bare << to mean <<"" is deprecated
2109
2110(D) You are now encouraged to use the explicitly quoted form if you
2111wish to use a blank line as the terminator of the here-document.
2112
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2113=item Use of implicit split to @_ is deprecated
2114
2115(D) It makes a lot of work for the compiler when you clobber a
2116subroutine's argument list, so it's better if you assign the results of
2117a split() explicitly to an array (or list).
2118
2119=item Use of uninitialized value
2120
2121(W) An undefined value was used as if it were already defined. It was
2122interpreted as a "" or a 0, but maybe it was a mistake. To suppress this
2123warning assign an initial value to your variables.
2124
2125=item Useless use of %s in void context
2126
2127(W) You did something without a side effect in a context that does nothing
2128with the return value, such as a statement that doesn't return a value
2129from a block, or the left side of a scalar comma operator. Very often
2130this points not to stupidity on your part, but a failure of Perl to parse
2131your program the way you thought it would. For example, you'd get this
2132if you mixed up your C precedence with Python precedence and said
2133
2134 $one, $two = 1, 2;
2135
2136when you meant to say
2137
2138 ($one, $two) = (1, 2);
2139
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LW
2140Another common error is to use ordinary parentheses to construct a list
2141reference when you should be using square or curly brackets, for
2142example, if you say
2143
2144 $array = (1,2);
2145
2146when you should have said
2147
2148 $array = [1,2];
2149
2150The square brackets explicitly turn a list value into a scalar value,
2151while parentheses do not. So when a parenthesized list is evaluated in
2152a scalar context, the comma is treated like C's comma operator, which
2153throws away the left argument, which is not what you want. See
2154L<perlref> for more on this.
2155
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LW
2156=item Variable "%s" is not exported
2157
2158(F) While "use strict" in effect, you referred to a global variable
2159that you apparently thought was imported from another module, because
2160something else of the same name (usually a subroutine) is exported
2161by that module. It usually means you put the wrong funny character
2162on the front of your variable.
2163
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2164=item Warning: unable to close filehandle %s properly.
2165
2166(S) The implicit close() done by an open() got an error indication on the
2167close(0. This usually indicates your filesystem ran out of disk space.
2168
2169=item Warning: Use of "%s" without parens is ambiguous
2170
2171(S) You wrote a unary operator followed by something that looks like a
2172binary operator that could also have been interpreted as a term or
2173unary operator. For instance, if you know that the rand function
2174has a default argument of 1.0, and you write
2175
2176 rand + 5;
2177
2178you may THINK you wrote the same thing as
2179
2180 rand() + 5;
2181
2182but in actual fact, you got
2183
2184 rand(+5);
2185
2186So put in parens to say what you really mean.
2187
2188=item Write on closed filehandle
2189
2190(W) The filehandle you're writing to got itself closed sometime before now.
2191Check your logic flow.
2192
2193=item X outside of string
2194
2195(F) You had a pack template that specified a relative position before
2196the beginning of the string being unpacked. See L<perlfunc/pack>.
2197
2198=item x outside of string
2199
2200(F) You had a pack template that specified a relative position after
2201the end of the string being unpacked. See L<perlfunc/pack>.
2202
2203=item Xsub "%s" called in sort
2204
2205(F) The use of an external subroutine as a sort comparison is not yet supported.
2206
2207=item Xsub called in sort
2208
2209(F) The use of an external subroutine as a sort comparison is not yet supported.
2210
2211=item You can't use C<-l> on a filehandle
2212
2213(F) A filehandle represents an opened file, and when you opened the file it
2214already went past any symlink you are presumably trying to look for.
2215Use a filename instead.
2216
2217=item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
2218
2219(F) And you probably never will, since you probably don't have the
2220sources to your kernel, and your vendor probably doesn't give a rip
2221about what you want. Your best bet is to use the wrapsuid script in
2222the eg directory to put a setuid C wrapper around your script.
2223
2224=item You need to quote "%s"
2225
2226(W) You assigned a bareword as a signal handler name. Unfortunately, you
2227already have a subroutine of that name declared, which means that Perl 5
2228will try to call the subroutine when the assignment is executed, which is
2229probably not what you want. (If it IS what you want, put an & in front.)
2230
2231=item [gs]etsockopt() on closed fd
2232
2233(W) You tried to get or set a socket option on a closed socket.
2234Did you forget to check the return value of your socket() call?
2235See L<perlfunc/getsockopt>.
2236
2237=item \1 better written as $1
2238
2239(W) Outside of patterns, backreferences live on as variables. The use
2240of backslashes is grandfathered on the righthand side of a
2241substitution, but stylistically it's better to use the variable form
2242because other Perl programmers will expect it, and it works better
2243if there are more than 9 backreferences.
2244
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LW
2245=item '|' and '<' may not both be specified on command line
2246
2247(F) An error peculiar to VMS. Perl does its own command line redirection, and
2248found that STDIN was a pipe, and that you also tried to redirect STDIN using
2249'<'. Only one STDIN stream to a customer, please.
2250
2251=item '|' and '>' may not both be specified on command line
2252
2253(F) An error peculiar to VMS. Perl does its own command line redirection, and
2254thinks you tried to redirect stdout both to a file and into a pipe to another
2255command. You need to choose one or the other, though nothing's stopping you
2256from piping into a program or Perl script which 'splits' output into two
2257streams, such as
2258
2259 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
2260 while (<STDIN>) {
2261 print;
2262 print OUT;
2263 }
2264 close OUT;
2265
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2266=back
2267