Commit | Line | Data |
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a0d0e21e LW |
1 | =head1 NAME |
2 | ||
3 | perldiag - various Perl diagnostics | |
4 | ||
5 | =head1 DESCRIPTION | |
6 | ||
7 | These messages are classified as follows (listed in increasing order of | |
8 | desperation): | |
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). |
a0d0e21e | 17 | |
748a9306 | 18 | Optional warnings are enabled by using the B<-w> switch. Warnings may |
8b1a09fc | 19 | be captured by setting C<$SIG{__WARN__}> to a reference to a routine that will be |
748a9306 LW |
20 | called on each warning instead of printing it. See L<perlvar>. |
21 | Trappable errors may be trapped using the eval operator. See | |
22 | L<perlfunc/eval>. | |
a0d0e21e LW |
23 | |
24 | Some of these messages are generic. Spots that vary are denoted with a %s, | |
2ba9eb46 | 25 | just as in a printf format. Note that some messages start with a %s! |
a0d0e21e LW |
26 | The 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 | |
33 | to try to declare one with a package qualifier on the front. Use local() | |
34 | if you want to localize a package variable. | |
35 | ||
2ba9eb46 | 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 | |
39 | eliminating all access to the previous instance. This is almost always | |
8b1a09fc | 40 | a typographical error. Note that the earlier variable will still exist |
2ba9eb46 | 41 | until the end of the scope or until all closure referents to it are |
42 | destroyed. | |
43 | ||
a0d0e21e LW |
44 | =item "no" not allowed in expression |
45 | ||
46 | (F) The "no" keyword is recognized and executed at compile time, and returns | |
47 | no 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 | |
52 | no 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 | |
57 | checksumming process loses information, and you can't go the other | |
58 | way. 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 | |
8b1a09fc | 63 | by parentheses turns into a function, with all the list operators arguments |
a0d0e21e LW |
64 | found 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 | |
76 | it compiled correctly and ran its initialization code correctly. It's | |
77 | traditional to end such a file with a "1;", though any true value would | |
78 | do. 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 | |
83 | sees what it knows to be a term when it was expecting to see an operator, | |
84 | it gives you this warning. Usually it indicates that an operator or | |
85 | delimiter 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. | |
94 | Further 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 | |
99 | regular 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 | |
104 | before 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 | ||
cb1a09d0 AD |
110 | =item %s: Command not found. |
111 | ||
112 | (A) You've accidentally run your script through B<csh> instead | |
8b1a09fc | 113 | of Perl. Check the E<lt>#!E<gt> line, or manually feed your script |
cb1a09d0 AD |
114 | into Perl yourself. |
115 | ||
116 | =item %s: Expression syntax. | |
117 | ||
118 | (A) You've accidentally run your script through B<csh> instead | |
8b1a09fc | 119 | of Perl. Check the E<lt>#!E<gt> line, or manually feed your script |
cb1a09d0 AD |
120 | into Perl yourself. |
121 | ||
122 | =item %s: Undefined variable. | |
123 | ||
124 | (A) You've accidentally run your script through B<csh> instead | |
8b1a09fc | 125 | of Perl. Check the E<lt>#!E<gt> line, or manually feed your script |
cb1a09d0 AD |
126 | into Perl yourself. |
127 | ||
128 | =item %s: not found | |
129 | ||
8b1a09fc | 130 | (A) You've accidentally run your script through the Bourne shell |
131 | instead of Perl. Check the E<lt>#!E<gt> line, or manually feed your script | |
cb1a09d0 AD |
132 | into Perl yourself. |
133 | ||
a0d0e21e LW |
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, | |
137 | which 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 | |
142 | know about your kind of stdio. You'll have to use a filename instead. | |
143 | ||
a5f75d66 AD |
144 | =item 500 Server error |
145 | ||
146 | See Server error. | |
147 | ||
a0d0e21e LW |
148 | =item ?+* follows nothing in regexp |
149 | ||
150 | (F) You started a regular expression with a quantifier. Backslash it | |
151 | if 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 |
a0d0e21e LW |
156 | the 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 | |
161 | the 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 | ||
748a9306 LW |
171 | =item Ambiguous use of %s resolved as %s |
172 | ||
173 | (W)(S) You said something that may not be interpreted the way | |
174 | you thought. Normally it's pretty easy to disambiguate it by supplying | |
175 | a missing quote, operator, paren pair or declaration. | |
176 | ||
a0d0e21e LW |
177 | =item Args must match #! line |
178 | ||
179 | (F) The setuid emulator requires that the arguments Perl was invoked | |
180 | with 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 | |
185 | expected a numeric value instead. If you're fortunate the message | |
186 | will 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 | |
191 | is 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 | |
204 | must either both be scalars or both be lists. Otherwise Perl won't | |
205 | know 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 | |
210 | be garbage collected on exit. An SV was discovered to be outside any | |
211 | of those arenas. | |
212 | ||
213 | =item Attempt to free temp prematurely | |
214 | ||
215 | (W) Mortalized values are supposed to be freed by the free_tmps() | |
216 | routine. This indicates that something else is freeing the SV before | |
217 | the free_tmps() routine gets a chance, which means that the free_tmps() | |
218 | routine will be freeing an unreferenced scalar when it does try to free | |
219 | it. | |
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 | |
228 | would go to 0, and discovered that it had already gone to 0 earlier, | |
229 | and should have been freed, and in fact, probably was freed. This | |
230 | could indicate that SvREFCNT_dec() was called too many times, or that | |
231 | SvREFCNT_inc() was called too few times, or that the SV was mortalized | |
232 | when it shouldn't have been, or that memory has been corrupted. | |
233 | ||
b7a902f4 | 234 | =item Attempt to use reference as lvalue in substr |
235 | ||
236 | (W) You supplied a reference as the first argument to substr() used | |
8b1a09fc | 237 | as an lvalue, which is pretty strange. Perhaps you forgot to |
b7a902f4 | 238 | dereference it first. See L<perlfunc/substr>. |
239 | ||
a0d0e21e LW |
240 | =item Bad arg length for %s, is %d, should be %d |
241 | ||
242 | (F) You passed a buffer of the wrong size to one of msgctl(), semctl() or | |
2ba9eb46 | 243 | shmctl(). In C parlance, the correct sizes are, respectively, |
a0d0e21e LW |
244 | S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)> and |
245 | S<sizeof(struct shmid_ds *)>. | |
246 | ||
247 | =item Bad associative array | |
248 | ||
249 | (P) One of the internal hash routines was passed a null HV pointer. | |
250 | ||
251 | =item Bad filehandle: %s | |
252 | ||
253 | (F) A symbol was passed to something wanting a filehandle, but the symbol | |
254 | has no filehandle associated with it. Perhaps you didn't do an open(), or | |
255 | did it in another package. | |
256 | ||
257 | =item Bad free() ignored | |
258 | ||
259 | (S) An internal routine called free() on something that had never been | |
260 | malloc()ed in the first place. | |
261 | ||
262 | =item Bad name after %s:: | |
263 | ||
264 | (F) You started to name a symbol by using a package prefix, and then didn't | |
265 | finish the symbol. In particular, you can't interpolate outside of quotes, | |
266 | so | |
267 | ||
268 | $var = 'myvar'; | |
269 | $sym = mypack::$var; | |
270 | ||
271 | is not the same as | |
272 | ||
273 | $var = 'myvar'; | |
274 | $sym = "mypack::$var"; | |
275 | ||
276 | =item Bad symbol for array | |
277 | ||
278 | (P) An internal request asked to add an array entry to something that | |
279 | wasn't a symbol table entry. | |
280 | ||
281 | =item Bad symbol for filehandle | |
282 | ||
283 | (P) An internal request asked to add a filehandle entry to something that | |
284 | wasn't a symbol table entry. | |
285 | ||
286 | =item Bad symbol for hash | |
287 | ||
288 | (P) An internal request asked to add a hash entry to something that | |
289 | wasn't a symbol table entry. | |
290 | ||
8b1a09fc | 291 | =item Badly placed ()'s |
cb1a09d0 AD |
292 | |
293 | (A) You've accidentally run your script through B<csh> instead | |
8b1a09fc | 294 | of Perl. Check the E<lt>#!E<gt> line, or manually feed your script |
cb1a09d0 AD |
295 | into Perl yourself. |
296 | ||
a0d0e21e LW |
297 | =item BEGIN failed--compilation aborted |
298 | ||
299 | (F) An untrapped exception was raised while executing a BEGIN subroutine. | |
300 | Compilation stops immediately and the interpreter is exited. | |
301 | ||
302 | =item bind() on closed fd | |
303 | ||
304 | (W) You tried to do a bind on a closed socket. Did you forget to check | |
305 | the return value of your socket() call? See L<perlfunc/bind>. | |
306 | ||
4633a7c4 LW |
307 | =item Bizarre copy of %s in %s |
308 | ||
309 | (P) Perl detected an attempt to copy an internal value that is not copiable. | |
310 | ||
a0d0e21e LW |
311 | =item Callback called exit |
312 | ||
313 | (F) A subroutine invoked from an external package via perl_call_sv() | |
314 | exited by calling exit. | |
315 | ||
316 | =item Can't "last" outside a block | |
317 | ||
318 | (F) A "last" statement was executed to break out of the current block, | |
319 | except that there's this itty bitty problem called there isn't a | |
320 | current block. Note that an "if" or "else" block doesn't count as a | |
321 | "loopish" block. You can usually double the curlies to get the same | |
322 | effect though, since the inner curlies will be considered a block | |
323 | that loops once. See L<perlfunc/last>. | |
324 | ||
325 | =item Can't "next" outside a block | |
326 | ||
327 | (F) A "next" statement was executed to reiterate the current block, but | |
328 | there isn't a current block. Note that an "if" or "else" block doesn't | |
329 | count as a "loopish" block. You can usually double the curlies to get | |
330 | the same effect though, since the inner curlies will be considered a block | |
331 | that loops once. See L<perlfunc/last>. | |
332 | ||
333 | =item Can't "redo" outside a block | |
334 | ||
335 | (F) A "redo" statement was executed to restart the current block, but | |
336 | there isn't a current block. Note that an "if" or "else" block doesn't | |
337 | count as a "loopish" block. You can usually double the curlies to get | |
338 | the same effect though, since the inner curlies will be considered a block | |
339 | that loops once. See L<perlfunc/last>. | |
340 | ||
341 | =item Can't bless non-reference value | |
342 | ||
343 | (F) Only hard references may be blessed. This is how Perl "enforces" | |
344 | encapsulation of objects. See L<perlobj>. | |
345 | ||
346 | =item Can't break at that line | |
347 | ||
348 | (S) A warning intended for while running within the debugger, indicating | |
349 | the line number specified wasn't the location of a statement that could | |
350 | be stopped at. | |
351 | ||
352 | =item Can't call method "%s" in empty package "%s" | |
353 | ||
354 | (F) You called a method correctly, and it correctly indicated a package | |
355 | functioning as a class, but that package doesn't have ANYTHING defined | |
356 | in it, let alone methods. See L<perlobj>. | |
357 | ||
358 | =item Can't call method "%s" on unblessed reference | |
359 | ||
360 | (F) A method call must know what package it's supposed to run in. It | |
361 | ordinarily finds this out from the object reference you supply, but | |
362 | you didn't supply an object reference in this case. A reference isn't | |
363 | an object reference until it has been blessed. See L<perlobj>. | |
364 | ||
365 | =item Can't call method "%s" without a package or object reference | |
366 | ||
367 | (F) You used the syntax of a method call, but the slot filled by the | |
368 | object reference or package name contains an expression that returns | |
369 | neither an object reference nor a package name. (Perhaps it's null?) | |
370 | Something like this will reproduce the error: | |
371 | ||
372 | $BADREF = undef; | |
373 | process $BADREF 1,2,3; | |
374 | $BADREF->process(1,2,3); | |
375 | ||
376 | =item Can't chdir to %s | |
377 | ||
378 | (F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory | |
379 | that you can chdir to, possibly because it doesn't exist. | |
380 | ||
381 | =item Can't coerce %s to integer in %s | |
382 | ||
383 | (F) Certain types of SVs, in particular real symbol table entries | |
384 | (type GLOB), can't be forced to stop being what they are. So you can't | |
385 | say things like: | |
386 | ||
387 | *foo += 1; | |
388 | ||
389 | You CAN say | |
390 | ||
391 | $foo = *foo; | |
392 | $foo += 1; | |
393 | ||
394 | but then $foo no longer contains a glob. | |
395 | ||
396 | =item Can't coerce %s to number in %s | |
397 | ||
398 | (F) Certain types of SVs, in particular real symbol table entries | |
399 | (type GLOB), can't be forced to stop being what they are. | |
400 | ||
401 | =item Can't coerce %s to string in %s | |
402 | ||
403 | (F) Certain types of SVs, in particular real symbol table entries | |
404 | (type GLOB), can't be forced to stop being what they are. | |
405 | ||
406 | =item Can't create pipe mailbox | |
407 | ||
748a9306 LW |
408 | (P) An error peculiar to VMS. The process is suffering from exhausted quotas |
409 | or other plumbing problems. | |
a0d0e21e LW |
410 | |
411 | =item Can't declare %s in my | |
412 | ||
413 | (F) Only scalar, array and hash variables may be declared as lexical variables. | |
414 | They must have ordinary identifiers as names. | |
415 | ||
416 | =item Can't do inplace edit on %s: %s | |
417 | ||
418 | (S) The creation of the new file failed for the indicated reason. | |
419 | ||
420 | =item Can't do inplace edit without backup | |
421 | ||
422 | (F) You're on a system such as MSDOS that gets confused if you try reading | |
423 | from a deleted (but still opened) file. You have to say B<-i>C<.bak>, or some | |
424 | such. | |
425 | ||
8b1a09fc | 426 | =item Can't do inplace edit: %s E<gt> 14 characters |
a0d0e21e LW |
427 | |
428 | (S) There isn't enough room in the filename to make a backup name for the file. | |
429 | ||
430 | =item Can't do inplace edit: %s is not a regular file | |
431 | ||
432 | (S) You tried to use the B<-i> switch on a special file, such as a file in | |
433 | /dev, or a FIFO. The file was ignored. | |
434 | ||
435 | =item Can't do setegid! | |
436 | ||
437 | (P) The setegid() call failed for some reason in the setuid emulator | |
438 | of suidperl. | |
439 | ||
440 | =item Can't do seteuid! | |
441 | ||
442 | (P) The setuid emulator of suidperl failed for some reason. | |
443 | ||
444 | =item Can't do setuid | |
445 | ||
446 | (F) This typically means that ordinary perl tried to exec suidperl to | |
447 | do setuid emulation, but couldn't exec it. It looks for a name of the | |
448 | form sperl5.000 in the same directory that the perl executable resides | |
449 | under the name perl5.000, typically /usr/local/bin on Unix machines. | |
450 | If the file is there, check the execute permissions. If it isn't, ask | |
451 | your sysadmin why he and/or she removed it. | |
452 | ||
453 | =item Can't do waitpid with flags | |
454 | ||
455 | (F) This machine doesn't have either waitpid() or wait4(), so only waitpid() | |
456 | without flags is emulated. | |
457 | ||
8b1a09fc | 458 | =item Can't do {n,m} with n E<gt> m |
a0d0e21e LW |
459 | |
460 | (F) Minima must be less than or equal to maxima. If you really want | |
461 | your regexp to match something 0 times, just put {0}. See L<perlre>. | |
462 | ||
463 | =item Can't emulate -%s on #! line | |
464 | ||
465 | (F) The #! line specifies a switch that doesn't make sense at this point. | |
466 | For example, it'd be kind of silly to put a B<-x> on the #! line. | |
467 | ||
468 | =item Can't exec "%s": %s | |
469 | ||
470 | (W) An system(), exec() or piped open call could not execute the named | |
471 | program for the indicated reason. Typical reasons include: the permissions | |
472 | were wrong on the file, the file wasn't found in C<$ENV{PATH}>, the | |
473 | executable in question was compiled for another architecture, or the | |
474 | #! line in a script points to an interpreter that can't be run for | |
475 | similar reasons. (Or maybe your system doesn't support #! at all.) | |
476 | ||
477 | =item Can't exec %s | |
478 | ||
479 | (F) Perl was trying to execute the indicated program for you because that's | |
480 | what the #! line said. If that's not what you wanted, you may need to | |
481 | mention "perl" on the #! line somewhere. | |
482 | ||
483 | =item Can't execute %s | |
484 | ||
485 | (F) You used the B<-S> switch, but the script to execute could not be found | |
486 | in the PATH, or at least not with the correct permissions. | |
487 | ||
488 | =item Can't find label %s | |
489 | ||
490 | (F) You said to goto a label that isn't mentioned anywhere that it's possible | |
491 | for us to go to. See L<perlfunc/goto>. | |
492 | ||
493 | =item Can't find string terminator %s anywhere before EOF | |
494 | ||
495 | (F) Perl strings can stretch over multiple lines. This message means that | |
496 | the closing delimiter was omitted. Since bracketed quotes count nesting | |
497 | levels, the following is missing its final parenthesis: | |
498 | ||
499 | print q(The character '(' starts a side comment.) | |
500 | ||
501 | =item Can't fork | |
502 | ||
503 | (F) A fatal error occurred while trying to fork while opening a pipeline. | |
504 | ||
748a9306 LW |
505 | =item Can't get filespec - stale stat buffer? |
506 | ||
507 | (S) A warning peculiar to VMS. This arises because of the difference between | |
508 | access checks under VMS and under the Unix model Perl assumes. Under VMS, | |
509 | access checks are done by filename, rather than by bits in the stat buffer, so | |
510 | that ACLs and other protections can be taken into account. Unfortunately, Perl | |
511 | assumes that the stat buffer contains all the necessary information, and passes | |
512 | it, instead of the filespec, to the access checking routine. It will try to | |
513 | retrieve the filespec using the device name and FID present in the stat buffer, | |
514 | but this works only if you haven't made a subsequent call to the CRTL stat() | |
515 | routine, since the device name is overwritten with each call. If this warning | |
516 | appears, the name lookup failed, and the access checking routine gave up and | |
517 | returned FALSE, just to be conservative. (Note: The access checking routine | |
518 | knows about the Perl C<stat> operator and file tests, so you shouldn't ever | |
519 | see this warning in response to a Perl command; it arises only if some internal | |
520 | code takes stat buffers lightly.) | |
521 | ||
a0d0e21e LW |
522 | =item Can't get pipe mailbox device name |
523 | ||
748a9306 LW |
524 | (P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl |
525 | can't retrieve its name for later use. | |
a0d0e21e LW |
526 | |
527 | =item Can't get SYSGEN parameter value for MAXBUF | |
528 | ||
748a9306 LW |
529 | (P) An error peculiar to VMS. Perl asked $GETSYI how big you want your |
530 | mailbox buffers to be, and didn't get an answer. | |
a0d0e21e LW |
531 | |
532 | =item Can't goto subroutine outside a subroutine | |
533 | ||
534 | (F) The deeply magical "goto subroutine" call can only replace one subroutine | |
535 | call for another. It can't manufacture one out of whole cloth. In general | |
536 | you should only be calling it out of an AUTOLOAD routine anyway. See | |
537 | L<perlfunc/goto>. | |
538 | ||
4633a7c4 LW |
539 | =item Can't localize a reference |
540 | ||
541 | (F) You said something like C<local $$ref>, which is not allowed because | |
542 | the compiler can't determine whether $ref will end up pointing to anything | |
543 | with a symbol table entry, and a symbol table entry is necessary to | |
544 | do a local. | |
545 | ||
748a9306 LW |
546 | =item Can't localize lexical variable %s |
547 | ||
2ba9eb46 | 548 | (F) You used local on a variable name that was previously declared as a |
748a9306 LW |
549 | lexical variable using "my". This is not allowed. If you want to |
550 | localize a package variable of the same name, qualify it with the | |
551 | package name. | |
552 | ||
a0d0e21e LW |
553 | =item Can't locate %s in @INC |
554 | ||
555 | (F) You said to do (or require, or use) a file that couldn't be found | |
556 | in any of the libraries mentioned in @INC. Perhaps you need to set | |
557 | the PERL5LIB environment variable to say where the extra library is, | |
558 | or maybe the script needs to add the library name to @INC. Or maybe | |
559 | you just misspelled the name of the file. See L<perlfunc/require>. | |
560 | ||
561 | =item Can't locate object method "%s" via package "%s" | |
562 | ||
563 | (F) You called a method correctly, and it correctly indicated a package | |
564 | functioning as a class, but that package doesn't define that particular | |
2ba9eb46 | 565 | method, nor does any of its base classes. See L<perlobj>. |
a0d0e21e LW |
566 | |
567 | =item Can't locate package %s for @%s::ISA | |
568 | ||
569 | (W) The @ISA array contained the name of another package that doesn't seem | |
570 | to exist. | |
571 | ||
572 | =item Can't mktemp() | |
573 | ||
574 | (F) The mktemp() routine failed for some reason while trying to process | |
575 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. | |
576 | ||
577 | =item Can't modify %s in %s | |
578 | ||
579 | (F) You aren't allowed to assign to the item indicated, or otherwise try to | |
580 | change it, such as with an autoincrement. | |
581 | ||
582 | =item Can't modify non-existent substring | |
583 | ||
584 | (P) The internal routine that does assignment to a substr() was handed | |
585 | a NULL. | |
586 | ||
587 | =item Can't msgrcv to readonly var | |
588 | ||
589 | (F) The target of a msgrcv must be modifiable in order to be used as a receive | |
590 | buffer. | |
591 | ||
592 | =item Can't open %s: %s | |
593 | ||
594 | (S) An inplace edit couldn't open the original file for the indicated reason. | |
595 | Usually this is because you don't have read permission for the file. | |
596 | ||
597 | =item Can't open bidirectional pipe | |
598 | ||
599 | (W) You tried to say C<open(CMD, "|cmd|")>, which is not supported. You can | |
600 | try any of several modules in the Perl library to do this, such as | |
8b1a09fc | 601 | "open2.pl". Alternately, direct the pipe's output to a file using "E<gt>", |
a0d0e21e LW |
602 | and then read it in under a different file handle. |
603 | ||
748a9306 LW |
604 | =item Can't open error file %s as stderr |
605 | ||
606 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
8b1a09fc | 607 | couldn't open the file specified after '2E<gt>' or '2E<gt>E<gt>' on the |
608 | command line for writing. | |
748a9306 LW |
609 | |
610 | =item Can't open input file %s as stdin | |
611 | ||
612 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
8b1a09fc | 613 | couldn't open the file specified after 'E<lt>' on the command line for reading. |
748a9306 LW |
614 | |
615 | =item Can't open output file %s as stdout | |
616 | ||
617 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
8b1a09fc | 618 | couldn't open the file specified after 'E<gt>' or 'E<gt>E<gt>' on the command |
619 | line for writing. | |
748a9306 LW |
620 | |
621 | =item Can't open output pipe (name: %s) | |
622 | ||
623 | (P) An error peculiar to VMS. Perl does its own command line redirection, and | |
624 | couldn't open the pipe into which to send data destined for stdout. | |
625 | ||
a0d0e21e LW |
626 | =item Can't open perl script "%s": %s |
627 | ||
628 | (F) The script you specified can't be opened for the indicated reason. | |
629 | ||
630 | =item Can't rename %s to %s: %s, skipping file | |
631 | ||
632 | (S) The rename done by the B<-i> switch failed for some reason, probably because | |
633 | you don't have write permission to the directory. | |
634 | ||
748a9306 LW |
635 | =item Can't reopen input pipe (name: %s) in binary mode |
636 | ||
637 | (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to | |
638 | reopen it to accept binary data. Alas, it failed. | |
639 | ||
a0d0e21e LW |
640 | =item Can't reswap uid and euid |
641 | ||
642 | (P) The setreuid() call failed for some reason in the setuid emulator | |
643 | of suidperl. | |
644 | ||
645 | =item Can't return outside a subroutine | |
646 | ||
647 | (F) The return statement was executed in mainline code, that is, where | |
648 | there was no subroutine call to return out of. See L<perlsub>. | |
649 | ||
650 | =item Can't stat script "%s" | |
651 | ||
652 | (P) For some reason you can't fstat() the script even though you have | |
653 | it open already. Bizarre. | |
654 | ||
655 | =item Can't swap uid and euid | |
656 | ||
657 | (P) The setreuid() call failed for some reason in the setuid emulator | |
658 | of suidperl. | |
659 | ||
660 | =item Can't take log of %g | |
661 | ||
662 | (F) Logarithms are only defined on positive real numbers. | |
663 | ||
664 | =item Can't take sqrt of %g | |
665 | ||
666 | (F) For ordinary real numbers, you can't take the square root of a | |
667 | negative number. There's a Complex package available for Perl, though, | |
668 | if you really want to do that. | |
669 | ||
670 | =item Can't undef active subroutine | |
671 | ||
672 | (F) You can't undefine a routine that's currently running. You can, | |
673 | however, redefine it while it's running, and you can even undef the | |
674 | redefined subroutine while the old routine is running. Go figure. | |
675 | ||
676 | =item Can't unshift | |
677 | ||
678 | (F) You tried to unshift an "unreal" array that can't be unshifted, such | |
679 | as the main Perl stack. | |
680 | ||
2ba9eb46 | 681 | =item Can't untie: %d inner references still exist |
682 | ||
683 | (F) With "use strict untie" in effect, a copy of the object returned | |
684 | from C<tie> (or C<tied>) was still valid when C<untie> was called. | |
685 | ||
a0d0e21e LW |
686 | =item Can't upgrade that kind of scalar |
687 | ||
688 | (P) The internal sv_upgrade routine adds "members" to an SV, making | |
689 | it into a more specialized kind of SV. The top several SV types are | |
690 | so specialized, however, that they cannot be interconverted. This | |
691 | message indicates that such a conversion was attempted. | |
692 | ||
693 | =item Can't upgrade to undef | |
694 | ||
695 | (P) The undefined SV is the bottom of the totem pole, in the scheme | |
696 | of upgradability. Upgrading to undef indicates an error in the | |
697 | code calling sv_upgrade. | |
698 | ||
c07a80fd | 699 | =item Can't use "my %s" in sort comparison |
700 | ||
701 | (F) The global variables $a and $b are reserved for sort comparisons. | |
8b1a09fc | 702 | You mentioned $a or $b in the same line as the E<lt>=E<gt> or cmp operator, |
c07a80fd | 703 | and the variable had earlier been declared as a lexical variable. |
704 | Either qualify the sort variable with the package name, or rename the | |
705 | lexical variable. | |
706 | ||
a0d0e21e LW |
707 | =item Can't use %s for loop variable |
708 | ||
709 | (F) Only a simple scalar variable may be used as a loop variable on a foreach. | |
710 | ||
711 | =item Can't use %s ref as %s ref | |
712 | ||
713 | (F) You've mixed up your reference types. You have to dereference a | |
714 | reference of the type needed. You can use the ref() function to | |
715 | test the type of the reference, if need be. | |
716 | ||
748a9306 LW |
717 | =item Can't use \1 to mean $1 in expression |
718 | ||
719 | (W) In an ordinary expression, backslash is a unary operator that creates | |
720 | a reference to its argument. The use of backslash to indicate a backreference | |
721 | to a matched substring is only valid as part of a regular expression pattern. | |
722 | Trying to do this in ordinary Perl code produces a value that prints | |
723 | out looking like SCALAR(0xdecaf). Use the $1 form instead. | |
724 | ||
725 | =item Can't use string ("%s") as %s ref while "strict refs" in use | |
a0d0e21e LW |
726 | |
727 | (F) Only hard references are allowed by "strict refs". Symbolic references | |
728 | are disallowed. See L<perlref>. | |
729 | ||
730 | =item Can't use an undefined value as %s reference | |
731 | ||
732 | (F) A value used as either a hard reference or a symbolic reference must | |
733 | be a defined value. This helps to de-lurk some insidious errors. | |
734 | ||
a0d0e21e LW |
735 | =item Can't use global %s in "my" |
736 | ||
737 | (F) You tried to declare a magical variable as a lexical variable. This is | |
738 | not allowed, because the magic can only be tied to one location (namely | |
739 | the global variable) and it would be incredibly confusing to have | |
740 | variables in your program that looked like magical variables but | |
741 | weren't. | |
742 | ||
748a9306 LW |
743 | =item Can't use subscript on %s |
744 | ||
745 | (F) The compiler tried to interpret a bracketed expression as a | |
746 | subscript. But to the left of the brackets was an expression that | |
747 | didn't look like an array reference, or anything else subscriptable. | |
748 | ||
a0d0e21e LW |
749 | =item Can't write to temp file for B<-e>: %s |
750 | ||
751 | (F) The write routine failed for some reason while trying to process | |
752 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. | |
753 | ||
754 | =item Can't x= to readonly value | |
755 | ||
756 | (F) You tried to repeat a constant value (often the undefined value) with | |
757 | an assignment operator, which implies modifying the value itself. | |
758 | Perhaps you need to copy the value to a temporary, and repeat that. | |
759 | ||
760 | =item Cannot open temporary file | |
761 | ||
8b1a09fc | 762 | (F) The create routine failed for some reason while trying to process |
a0d0e21e LW |
763 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. |
764 | ||
765 | =item chmod: mode argument is missing initial 0 | |
766 | ||
767 | (W) A novice will sometimes say | |
768 | ||
769 | chmod 777, $filename | |
770 | ||
771 | not realizing that 777 will be interpreted as a decimal number, equivalent | |
772 | to 01411. Octal constants are introduced with a leading 0 in Perl, as in C. | |
773 | ||
8b1a09fc | 774 | =item Close on unopened file E<lt>%sE<gt> |
a0d0e21e LW |
775 | |
776 | (W) You tried to close a filehandle that was never opened. | |
777 | ||
778 | =item connect() on closed fd | |
779 | ||
780 | (W) You tried to do a connect on a closed socket. Did you forget to check | |
781 | the return value of your socket() call? See L<perlfunc/connect>. | |
782 | ||
783 | =item Corrupt malloc ptr 0x%lx at 0x%lx | |
784 | ||
785 | (P) The malloc package that comes with Perl had an internal failure. | |
786 | ||
787 | =item corrupted regexp pointers | |
788 | ||
789 | (P) The regular expression engine got confused by what the regular | |
790 | expression compiler gave it. | |
791 | ||
792 | =item corrupted regexp program | |
793 | ||
794 | (P) The regular expression engine got passed a regexp program without | |
795 | a valid magic number. | |
796 | ||
797 | =item Deep recursion on subroutine "%s" | |
798 | ||
799 | (W) This subroutine has called itself (directly or indirectly) 100 | |
800 | times than it has returned. This probably indicates an infinite | |
801 | recursion, unless you're writing strange benchmark programs, in which | |
802 | case it indicates something else. | |
803 | ||
4633a7c4 LW |
804 | =item Did you mean &%s instead? |
805 | ||
806 | (W) You probably referred to an imported subroutine &FOO as $FOO or some such. | |
807 | ||
748a9306 | 808 | =item Did you mean $ or @ instead of %? |
a0d0e21e | 809 | |
748a9306 LW |
810 | (W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}. |
811 | On the other hand, maybe you just meant %hash and got carried away. | |
812 | ||
813 | =item Do you need to predeclare %s? | |
814 | ||
815 | (S) This is an educated guess made in conjunction with the message "%s | |
816 | found where operator expected". It often means a subroutine or module | |
817 | name is being referenced that hasn't been declared yet. This may be | |
818 | because of ordering problems in your file, or because of a missing | |
819 | "sub", "package", "require", or "use" statement. If you're | |
820 | referencing something that isn't defined yet, you don't actually have | |
821 | to define the subroutine or package before the current location. You | |
822 | can use an empty "sub foo;" or "package FOO;" to enter a "forward" | |
823 | declaration. | |
a0d0e21e LW |
824 | |
825 | =item Don't know how to handle magic of type '%s' | |
826 | ||
827 | (P) The internal handling of magical variables has been cursed. | |
828 | ||
829 | =item do_study: out of memory | |
830 | ||
831 | (P) This should have been caught by safemalloc() instead. | |
832 | ||
833 | =item Duplicate free() ignored | |
834 | ||
835 | (S) An internal routine called free() on something that had already | |
836 | been freed. | |
837 | ||
4633a7c4 LW |
838 | =item elseif should be elsif |
839 | ||
840 | (S) There is no keyword "elseif" in Perl because Larry thinks it's | |
841 | ugly. Your code will be interpreted as an attempt to call a method | |
842 | named "elseif" for the class returned by the following block. This is | |
843 | unlikely to be what you want. | |
844 | ||
a0d0e21e LW |
845 | =item END failed--cleanup aborted |
846 | ||
847 | (F) An untrapped exception was raised while executing an END subroutine. | |
848 | The interpreter is immediately exited. | |
849 | ||
748a9306 LW |
850 | =item Error converting file specification %s |
851 | ||
852 | (F) An error peculiar to VMS. Since Perl may have to deal with file | |
853 | specifications in either VMS or Unix syntax, it converts them to a | |
854 | single form when it must operate on them directly. Either you've | |
855 | passed an invalid file specification to Perl, or you've found a | |
856 | case the conversion routines don't handle. Drat. | |
857 | ||
a0d0e21e LW |
858 | =item Execution of %s aborted due to compilation errors. |
859 | ||
860 | (F) The final summary message when a Perl compilation fails. | |
861 | ||
862 | =item Exiting eval via %s | |
863 | ||
8b1a09fc | 864 | (W) You are exiting an eval by unconventional means, such as |
a0d0e21e LW |
865 | a goto, or a loop control statement. |
866 | ||
867 | =item Exiting subroutine via %s | |
868 | ||
8b1a09fc | 869 | (W) You are exiting a subroutine by unconventional means, such as |
a0d0e21e LW |
870 | a goto, or a loop control statement. |
871 | ||
872 | =item Exiting substitution via %s | |
873 | ||
8b1a09fc | 874 | (W) You are exiting a substitution by unconventional means, such as |
a0d0e21e LW |
875 | a return, a goto, or a loop control statement. |
876 | ||
748a9306 | 877 | =item Fatal VMS error at %s, line %d |
a0d0e21e | 878 | |
748a9306 LW |
879 | (P) An error peculiar to VMS. Something untoward happened in a VMS system |
880 | service or RTL routine; Perl's exit status should provide more details. The | |
881 | filename in "at %s" and the line number in "line %d" tell you which section of | |
882 | the Perl source code is distressed. | |
a0d0e21e LW |
883 | |
884 | =item fcntl is not implemented | |
885 | ||
886 | (F) Your machine apparently doesn't implement fcntl(). What is this, a | |
887 | PDP-11 or something? | |
888 | ||
889 | =item Filehandle %s never opened | |
890 | ||
891 | (W) An I/O operation was attempted on a filehandle that was never initialized. | |
892 | You need to do an open() or a socket() call, or call a constructor from | |
893 | the FileHandle package. | |
894 | ||
895 | =item Filehandle %s opened only for input | |
896 | ||
897 | (W) You tried to write on a read-only filehandle. If you | |
898 | intended it to be a read-write filehandle, you needed to open it with | |
8b1a09fc | 899 | "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If |
900 | you only intended to write the file, use "E<gt>" or "E<gt>E<gt>". See | |
901 | L<perlfunc/open>. | |
a0d0e21e LW |
902 | |
903 | =item Filehandle only opened for input | |
904 | ||
905 | (W) You tried to write on a read-only filehandle. If you | |
906 | intended it to be a read-write filehandle, you needed to open it with | |
8b1a09fc | 907 | "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If |
908 | you only intended to write the file, use "E<gt>" or "E<gt>E<gt>". See | |
909 | L<perlfunc/open>. | |
a0d0e21e LW |
910 | |
911 | =item Final $ should be \$ or $name | |
912 | ||
913 | (F) You must now decide whether the final $ in a string was meant to be | |
914 | a literal dollar sign, or was meant to introduce a variable name | |
915 | that happens to be missing. So you have to put either the backslash or | |
916 | the name. | |
917 | ||
918 | =item Final @ should be \@ or @name | |
919 | ||
920 | (F) You must now decide whether the final @ in a string was meant to be | |
921 | a literal "at" sign, or was meant to introduce a variable name | |
922 | that happens to be missing. So you have to put either the backslash or | |
923 | the name. | |
924 | ||
925 | =item Format %s redefined | |
926 | ||
927 | (W) You redefined a format. To suppress this warning, say | |
928 | ||
929 | { | |
930 | local $^W = 0; | |
931 | eval "format NAME =..."; | |
932 | } | |
933 | ||
934 | =item Format not terminated | |
935 | ||
936 | (F) A format must be terminated by a line with a solitary dot. Perl got | |
937 | to the end of your file without finding such a line. | |
938 | ||
939 | =item Found = in conditional, should be == | |
940 | ||
941 | (W) You said | |
942 | ||
943 | if ($foo = 123) | |
944 | ||
945 | when you meant | |
946 | ||
947 | if ($foo == 123) | |
948 | ||
949 | (or something like that). | |
950 | ||
951 | =item gdbm store returned %d, errno %d, key "%s" | |
952 | ||
953 | (S) A warning from the GDBM_File extension that a store failed. | |
954 | ||
955 | =item gethostent not implemented | |
956 | ||
957 | (F) Your C library apparently doesn't implement gethostent(), probably | |
958 | because if it did, it'd feel morally obligated to return every hostname | |
959 | on the Internet. | |
960 | ||
961 | =item get{sock,peer}name() on closed fd | |
962 | ||
963 | (W) You tried to get a socket or peer socket name on a closed socket. | |
964 | Did you forget to check the return value of your socket() call? | |
965 | ||
748a9306 LW |
966 | =item getpwnam returned invalid UIC %#o for user "%s" |
967 | ||
968 | (S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the | |
969 | C<getpwnam> operator returned an invalid UIC. | |
970 | ||
971 | ||
a0d0e21e LW |
972 | =item Glob not terminated |
973 | ||
974 | (F) The lexer saw a left angle bracket in a place where it was expecting | |
975 | a term, so it's looking for the corresponding right angle bracket, and not | |
976 | finding it. Chances are you left some needed parentheses out earlier in | |
977 | the line, and you really meant a "less than". | |
978 | ||
979 | =item Global symbol "%s" requires explicit package name | |
980 | ||
981 | (F) You've said "use strict vars", which indicates that all variables must | |
982 | either be lexically scoped (using "my"), or explicitly qualified to | |
983 | say which package the global variable is in (using "::"). | |
984 | ||
985 | =item goto must have label | |
986 | ||
987 | (F) Unlike with "next" or "last", you're not allowed to goto an | |
988 | unspecified destination. See L<perlfunc/goto>. | |
989 | ||
990 | =item Had to create %s unexpectedly | |
991 | ||
992 | (S) A routine asked for a symbol from a symbol table that ought to have | |
993 | existed already, but for some reason it didn't, and had to be created on | |
994 | an emergency basis to prevent a core dump. | |
995 | ||
996 | =item Hash %%s missing the % in argument %d of %s() | |
997 | ||
998 | (D) Really old Perl let you omit the % on hash names in some spots. This | |
999 | is now heavily deprecated. | |
1000 | ||
8b1a09fc | 1001 | =item Ill-formed logical name |%s| in prime_env_iter |
a0d0e21e | 1002 | |
8b1a09fc | 1003 | (W) A warning peculiar to VMS. A logical name was encountered when preparing |
1004 | to iterate over %ENV which violates the syntactic rules governing logical | |
1005 | names. Since it cannot be translated normally, it is skipped, and will not | |
1006 | appear in %ENV. This may be a benign occurence, as some software packages | |
1007 | might directly modify logical name tables and introduce non-standard names, | |
1008 | or it may indicate that a logical name table has been corrupted. | |
a0d0e21e LW |
1009 | |
1010 | =item Illegal division by zero | |
1011 | ||
1012 | (F) You tried to divide a number by 0. Either something was wrong in your | |
1013 | logic, or you need to put a conditional in to guard against meaningless input. | |
1014 | ||
1015 | =item Illegal modulus zero | |
1016 | ||
1017 | (F) You tried to divide a number by 0 to get the remainder. Most numbers | |
1018 | don't take to this kindly. | |
1019 | ||
1020 | =item Illegal octal digit | |
1021 | ||
1022 | (F) You used an 8 or 9 in a octal number. | |
1023 | ||
748a9306 LW |
1024 | =item Illegal octal digit ignored |
1025 | ||
1026 | (W) You may have tried to use an 8 or 9 in a octal number. Interpretation | |
1027 | of the octal number stopped before the 8 or 9. | |
1028 | ||
a0d0e21e LW |
1029 | =item Insecure dependency in %s |
1030 | ||
8b1a09fc | 1031 | (F) You tried to do something that the tainting mechanism didn't like. |
a0d0e21e LW |
1032 | The tainting mechanism is turned on when you're running setuid or setgid, |
1033 | or when you specify B<-T> to turn it on explicitly. The tainting mechanism | |
1034 | labels all data that's derived directly or indirectly from the user, | |
1035 | who is considered to be unworthy of your trust. If any such data is | |
1036 | used in a "dangerous" operation, you get this error. See L<perlsec> | |
1037 | for more information. | |
1038 | ||
1039 | =item Insecure directory in %s | |
1040 | ||
1041 | (F) You can't use system(), exec(), or a piped open in a setuid or setgid | |
8b1a09fc | 1042 | script if C<$ENV{PATH}> contains a directory that is writable by the world. |
a0d0e21e LW |
1043 | See L<perlsec>. |
1044 | ||
1045 | =item Insecure PATH | |
1046 | ||
1047 | (F) You can't use system(), exec(), or a piped open in a setuid or | |
8b1a09fc | 1048 | setgid script if C<$ENV{PATH}> is derived from data supplied (or |
a0d0e21e LW |
1049 | potentially supplied) by the user. The script must set the path to a |
1050 | known value, using trustworthy data. See L<perlsec>. | |
1051 | ||
748a9306 LW |
1052 | =item Internal inconsistency in tracking vforks |
1053 | ||
1054 | (S) A warning peculiar to VMS. Perl keeps track of the number | |
1055 | of times you've called C<fork> and C<exec>, in order to determine | |
2ba9eb46 | 1056 | whether the current call to C<exec> should affect the current |
748a9306 LW |
1057 | script or a subprocess (see L<perlvms/exec>). Somehow, this count |
1058 | has become scrambled, so Perl is making a guess and treating | |
1059 | this C<exec> as a request to terminate the Perl script | |
1060 | and execute the specified command. | |
1061 | ||
a0d0e21e LW |
1062 | =item internal disaster in regexp |
1063 | ||
1064 | (P) Something went badly wrong in the regular expression parser. | |
1065 | ||
1066 | =item internal urp in regexp at /%s/ | |
1067 | ||
1068 | (P) Something went badly awry in the regular expression parser. | |
1069 | ||
1070 | =item invalid [] range in regexp | |
1071 | ||
1072 | (F) The range specified in a character class had a minimum character | |
1073 | greater than the maximum character. See L<perlre>. | |
1074 | ||
1075 | =item ioctl is not implemented | |
1076 | ||
1077 | (F) Your machine apparently doesn't implement ioctl(), which is pretty | |
1078 | strange for a machine that supports C. | |
1079 | ||
1080 | =item junk on end of regexp | |
1081 | ||
1082 | (P) The regular expression parser is confused. | |
1083 | ||
1084 | =item Label not found for "last %s" | |
1085 | ||
1086 | (F) You named a loop to break out of, but you're not currently in a | |
1087 | loop of that name, not even if you count where you were called from. | |
1088 | See L<perlfunc/last>. | |
1089 | ||
1090 | =item Label not found for "next %s" | |
1091 | ||
1092 | (F) You named a loop to continue, but you're not currently in a loop of | |
1093 | that name, not even if you count where you were called from. See | |
1094 | L<perlfunc/last>. | |
1095 | ||
1096 | =item Label not found for "redo %s" | |
1097 | ||
1098 | (F) You named a loop to restart, but you're not currently in a loop of | |
1099 | that name, not even if you count where you were called from. See | |
1100 | L<perlfunc/last>. | |
1101 | ||
1102 | =item listen() on closed fd | |
1103 | ||
1104 | (W) You tried to do a listen on a closed socket. Did you forget to check | |
1105 | the return value of your socket() call? See L<perlfunc/listen>. | |
1106 | ||
1107 | =item Literal @%s now requires backslash | |
1108 | ||
1109 | (F) It used to be that Perl would try to guess whether you wanted an | |
1110 | array interpolated or a literal @. It did this when the string was | |
1111 | first used at runtime. Now strings are parsed at compile time, and | |
1112 | ambiguous instances of @ must be disambiguated, either by putting a | |
1113 | backslash to indicate a literal, or by declaring (or using) the array | |
1114 | within the program before the string (lexically). (Someday it will simply | |
1115 | assume that an unbackslashed @ interpolates an array.) | |
1116 | ||
1117 | =item Method for operation %s not found in package %s during blessing | |
1118 | ||
1119 | (F) An attempt was made to specify an entry in an overloading table that | |
8b1a09fc | 1120 | doesn't somehow point to a valid method. See L<overload>. |
a0d0e21e LW |
1121 | |
1122 | =item Might be a runaway multi-line %s string starting on line %d | |
1123 | ||
1124 | (S) An advisory indicating that the previous error may have been caused | |
1125 | by a missing delimiter on a string or pattern, because it eventually | |
1126 | ended earlier on the current line. | |
1127 | ||
1128 | =item Misplaced _ in number | |
1129 | ||
1130 | (W) An underline in a decimal constant wasn't on a 3-digit boundary. | |
1131 | ||
1132 | =item Missing $ on loop variable | |
1133 | ||
8b1a09fc | 1134 | (F) Apparently you've been programming in B<csh> too much. Variables are always |
1135 | mentioned with the $ in Perl, unlike in the shells, where it can vary from | |
a0d0e21e LW |
1136 | one line to the next. |
1137 | ||
1138 | =item Missing comma after first argument to %s function | |
1139 | ||
1140 | (F) While certain functions allow you to specify a filehandle or an | |
1141 | "indirect object" before the argument list, this ain't one of them. | |
1142 | ||
748a9306 LW |
1143 | =item Missing operator before %s? |
1144 | ||
1145 | (S) This is an educated guess made in conjunction with the message "%s | |
1146 | found where operator expected". Often the missing operator is a comma. | |
1147 | ||
a0d0e21e LW |
1148 | =item Missing right bracket |
1149 | ||
1150 | (F) The lexer counted more opening curly brackets (braces) than closing ones. | |
1151 | As a general rule, you'll find it's missing near the place you were last | |
1152 | editing. | |
1153 | ||
1154 | =item Missing semicolon on previous line? | |
1155 | ||
1156 | (S) This is an educated guess made in conjunction with the message "%s | |
1157 | found where operator expected". Don't automatically put a semicolon on | |
1158 | the previous line just because you saw this message. | |
1159 | ||
1160 | =item Modification of a read-only value attempted | |
1161 | ||
1162 | (F) You tried, directly or indirectly, to change the value of a | |
1163 | constant. You didn't, of course, try "2 = 1", since the compiler | |
1164 | catches that. But an easy way to do the same thing is: | |
1165 | ||
1166 | sub mod { $_[0] = 1 } | |
1167 | mod(2); | |
1168 | ||
1169 | Another way is to assign to a substr() that's off the end of the string. | |
1170 | ||
1171 | =item Modification of non-creatable array value attempted, subscript %d | |
1172 | ||
1173 | (F) You tried to make an array value spring into existence, and the | |
1174 | subscript was probably negative, even counting from end of the array | |
1175 | backwards. | |
1176 | ||
1177 | =item Modification of non-creatable hash value attempted, subscript "%s" | |
1178 | ||
1179 | (F) You tried to make a hash value spring into existence, and it couldn't | |
1180 | be created for some peculiar reason. | |
1181 | ||
1182 | =item Module name must be constant | |
1183 | ||
1184 | (F) Only a bare module name is allowed as the first argument to a "use". | |
1185 | ||
1186 | =item msg%s not implemented | |
1187 | ||
1188 | (F) You don't have System V message IPC on your system. | |
1189 | ||
1190 | =item Multidimensional syntax %s not supported | |
1191 | ||
8b1a09fc | 1192 | (W) Multidimensional arrays aren't written like C<$foo[1,2,3]>. They're written |
1193 | like C<$foo[1][2][3]>, as in C. | |
1194 | ||
1195 | =item Name "%s::%s" used only once: possible typo | |
1196 | ||
1197 | (W) Typographical errors often show up as unique variable names. If you | |
1198 | had a good reason for having a unique name, then just mention it | |
1199 | again somehow to suppress the message (the C<use vars> pragma is | |
1200 | provided for just this purpose). | |
a0d0e21e LW |
1201 | |
1202 | =item Negative length | |
1203 | ||
1204 | (F) You tried to do a read/write/send/recv operation with a buffer length | |
1205 | that is less than 0. This is difficult to imagine. | |
1206 | ||
1207 | =item nested *?+ in regexp | |
1208 | ||
1209 | (F) You can't quantify a quantifier without intervening parens. So | |
1210 | things like ** or +* or ?* are illegal. | |
1211 | ||
1212 | Note, however, that the minimal matching quantifiers, *?, +? and ?? appear | |
1213 | to be nested quantifiers, but aren't. See L<perlre>. | |
1214 | ||
1215 | =item No #! line | |
1216 | ||
1217 | (F) The setuid emulator requires that scripts have a well-formed #! line | |
1218 | even on machines that don't support the #! construct. | |
1219 | ||
1220 | =item No %s allowed while running setuid | |
1221 | ||
1222 | (F) Certain operations are deemed to be too insecure for a setuid or setgid | |
1223 | script to even be allowed to attempt. Generally speaking there will be | |
1224 | another way to do what you want that is, if not secure, at least securable. | |
1225 | See L<perlsec>. | |
1226 | ||
1227 | =item No B<-e> allowed in setuid scripts | |
1228 | ||
1229 | (F) A setuid script can't be specified by the user. | |
1230 | ||
1231 | =item No comma allowed after %s | |
1232 | ||
1233 | (F) A list operator that has a filehandle or "indirect object" is not | |
1234 | allowed to have a comma between that and the following arguments. | |
1235 | Otherwise it'd be just another one of the arguments. | |
1236 | ||
748a9306 LW |
1237 | =item No command into which to pipe on command line |
1238 | ||
1239 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
1240 | and found a '|' at the end of the command line, so it doesn't know whither you | |
1241 | want to pipe the output from this command. | |
1242 | ||
a0d0e21e LW |
1243 | =item No DB::DB routine defined |
1244 | ||
1245 | (F) The currently executing code was compiled with the B<-d> switch, | |
1246 | but for some reason the perl5db.pl file (or some facsimile thereof) | |
1247 | didn't define a routine to be called at the beginning of each | |
1248 | statement. Which is odd, because the file should have been required | |
1249 | automatically, and should have blown up the require if it didn't parse | |
1250 | right. | |
1251 | ||
1252 | =item No dbm on this machine | |
1253 | ||
1254 | (P) This is counted as an internal error, because every machine should | |
1255 | supply dbm nowadays, since Perl comes with SDBM. See L<SDBM_File>. | |
1256 | ||
1257 | =item No DBsub routine | |
1258 | ||
1259 | (F) The currently executing code was compiled with the B<-d> switch, | |
1260 | but for some reason the perl5db.pl file (or some facsimile thereof) | |
1261 | didn't define a DB::sub routine to be called at the beginning of each | |
1262 | ordinary subroutine call. | |
1263 | ||
8b1a09fc | 1264 | =item No error file after 2E<gt> or 2E<gt>E<gt> on command line |
748a9306 LW |
1265 | |
1266 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1267 | and found a '2E<gt>' or a '2E<gt>E<gt>' on the command line, but can't find |
1268 | the name of the file to which to write data destined for stderr. | |
748a9306 | 1269 | |
8b1a09fc | 1270 | =item No input file after E<lt> on command line |
748a9306 LW |
1271 | |
1272 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1273 | and found a 'E<lt>' on the command line, but can't find the name of the file |
1274 | from which to read data for stdin. | |
748a9306 | 1275 | |
8b1a09fc | 1276 | =item No output file after E<gt> on command line |
748a9306 LW |
1277 | |
1278 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1279 | and found a lone 'E<gt>' at the end of the command line, so it doesn't know |
1280 | whither you wanted to redirect stdout. | |
748a9306 | 1281 | |
8b1a09fc | 1282 | =item No output file after E<gt> or E<gt>E<gt> on command line |
748a9306 LW |
1283 | |
1284 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1285 | and found a 'E<gt>' or a 'E<gt>E<gt>' on the command line, but can't find the |
1286 | name of the file to which to write data destined for stdout. | |
748a9306 | 1287 | |
a0d0e21e LW |
1288 | =item No Perl script found in input |
1289 | ||
1290 | (F) You called C<perl -x>, but no line was found in the file beginning | |
1291 | with #! and containing the word "perl". | |
1292 | ||
1293 | =item No setregid available | |
1294 | ||
1295 | (F) Configure didn't find anything resembling the setregid() call for | |
1296 | your system. | |
1297 | ||
1298 | =item No setreuid available | |
1299 | ||
1300 | (F) Configure didn't find anything resembling the setreuid() call for | |
1301 | your system. | |
1302 | ||
1303 | =item No space allowed after B<-I> | |
1304 | ||
1305 | (F) The argument to B<-I> must follow the B<-I> immediately with no | |
1306 | intervening space. | |
1307 | ||
748a9306 LW |
1308 | =item No such pipe open |
1309 | ||
1310 | (P) An error peculiar to VMS. The internal routine my_pclose() tried to | |
1311 | close a pipe which hadn't been opened. This should have been caught earlier as | |
1312 | an attempt to close an unopened filehandle. | |
1313 | ||
a0d0e21e LW |
1314 | =item No such signal: SIG%s |
1315 | ||
1316 | (W) You specified a signal name as a subscript to %SIG that was not recognized. | |
1317 | Say C<kill -l> in your shell to see the valid signal names on your system. | |
1318 | ||
1319 | =item Not a CODE reference | |
1320 | ||
1321 | (F) Perl was trying to evaluate a reference to a code value (that is, a | |
1322 | subroutine), but found a reference to something else instead. You can | |
1323 | use the ref() function to find out what kind of ref it really was. | |
1324 | See also L<perlref>. | |
1325 | ||
1326 | =item Not a format reference | |
1327 | ||
1328 | (F) I'm not sure how you managed to generate a reference to an anonymous | |
1329 | format, but this indicates you did, and that it didn't exist. | |
1330 | ||
1331 | =item Not a GLOB reference | |
1332 | ||
1333 | (F) Perl was trying to evaluate a reference to a "type glob" (that is, | |
1334 | a symbol table entry that looks like C<*foo>), but found a reference to | |
1335 | something else instead. You can use the ref() function to find out | |
1336 | what kind of ref it really was. See L<perlref>. | |
1337 | ||
1338 | =item Not a HASH reference | |
1339 | ||
1340 | (F) Perl was trying to evaluate a reference to a hash value, but | |
1341 | found a reference to something else instead. You can use the ref() | |
1342 | function to find out what kind of ref it really was. See L<perlref>. | |
1343 | ||
1344 | =item Not a perl script | |
1345 | ||
1346 | (F) The setuid emulator requires that scripts have a well-formed #! line | |
1347 | even on machines that don't support the #! construct. The line must | |
1348 | mention perl. | |
1349 | ||
1350 | =item Not a SCALAR reference | |
1351 | ||
1352 | (F) Perl was trying to evaluate a reference to a scalar value, but | |
1353 | found a reference to something else instead. You can use the ref() | |
1354 | function to find out what kind of ref it really was. See L<perlref>. | |
1355 | ||
1356 | =item Not a subroutine reference | |
1357 | ||
1358 | (F) Perl was trying to evaluate a reference to a code value (that is, a | |
1359 | subroutine), but found a reference to something else instead. You can | |
1360 | use the ref() function to find out what kind of ref it really was. | |
1361 | See also L<perlref>. | |
1362 | ||
1363 | =item Not a subroutine reference in %OVERLOAD | |
1364 | ||
1365 | (F) An attempt was made to specify an entry in an overloading table that | |
8b1a09fc | 1366 | doesn't somehow point to a valid subroutine. See L<overload>. |
a0d0e21e LW |
1367 | |
1368 | =item Not an ARRAY reference | |
1369 | ||
1370 | (F) Perl was trying to evaluate a reference to an array value, but | |
1371 | found a reference to something else instead. You can use the ref() | |
1372 | function to find out what kind of ref it really was. See L<perlref>. | |
1373 | ||
1374 | =item Not enough arguments for %s | |
1375 | ||
1376 | (F) The function requires more arguments than you specified. | |
1377 | ||
1378 | =item Not enough format arguments | |
1379 | ||
1380 | (W) A format specified more picture fields than the next line supplied. | |
1381 | See L<perlform>. | |
1382 | ||
1383 | =item Null filename used | |
1384 | ||
1385 | (F) You can't require the null filename, especially since on many machines | |
1386 | that means the current directory! See L<perlfunc/require>. | |
1387 | ||
1388 | =item NULL OP IN RUN | |
1389 | ||
1390 | (P) Some internal routine called run() with a null opcode pointer. | |
1391 | ||
1392 | =item Null realloc | |
1393 | ||
1394 | (P) An attempt was made to realloc NULL. | |
1395 | ||
1396 | =item NULL regexp argument | |
1397 | ||
1398 | (P) The internal pattern matching routines blew it bigtime. | |
1399 | ||
1400 | =item NULL regexp parameter | |
1401 | ||
1402 | (P) The internal pattern matching routines are out of their gourd. | |
1403 | ||
1404 | =item Odd number of elements in hash list | |
1405 | ||
1406 | (S) You specified an odd number of elements to a hash list, which is odd, | |
1407 | since hash lists come in key/value pairs. | |
1408 | ||
1409 | =item oops: oopsAV | |
1410 | ||
1411 | (S) An internal warning that the grammar is screwed up. | |
1412 | ||
1413 | =item oops: oopsHV | |
1414 | ||
1415 | (S) An internal warning that the grammar is screwed up. | |
1416 | ||
1417 | =item Operation `%s' %s: no method found, | |
1418 | ||
1419 | (F) An attempt was made to use an entry in an overloading table that | |
8b1a09fc | 1420 | somehow no longer points to a valid method. See L<overload>. |
a0d0e21e | 1421 | |
748a9306 LW |
1422 | =item Operator or semicolon missing before %s |
1423 | ||
1424 | (S) You used a variable or subroutine call where the parser was | |
1425 | expecting an operator. The parser has assumed you really meant | |
1426 | to use an operator, but this is highly likely to be incorrect. | |
1427 | For example, if you say "*foo *foo" it will be interpreted as | |
1428 | if you said "*foo * 'foo'". | |
1429 | ||
a0d0e21e LW |
1430 | =item Out of memory for yacc stack |
1431 | ||
1432 | (F) The yacc parser wanted to grow its stack so it could continue parsing, | |
1433 | but realloc() wouldn't give it more memory, virtual or otherwise. | |
1434 | ||
1435 | =item Out of memory! | |
1436 | ||
1437 | (X) The malloc() function returned 0, indicating there was insufficient | |
1438 | remaining memory (or virtual memory) to satisfy the request. | |
1439 | ||
1440 | =item page overflow | |
1441 | ||
1442 | (W) A single call to write() produced more lines than can fit on a page. | |
1443 | See L<perlform>. | |
1444 | ||
1445 | =item panic: ck_grep | |
1446 | ||
1447 | (P) Failed an internal consistency check trying to compile a grep. | |
1448 | ||
1449 | =item panic: ck_split | |
1450 | ||
1451 | (P) Failed an internal consistency check trying to compile a split. | |
1452 | ||
1453 | =item panic: corrupt saved stack index | |
1454 | ||
1455 | (P) The savestack was requested to restore more localized values than there | |
1456 | are in the savestack. | |
1457 | ||
1458 | =item panic: die %s | |
1459 | ||
1460 | (P) We popped the context stack to an eval context, and then discovered | |
1461 | it wasn't an eval context. | |
1462 | ||
1463 | =item panic: do_match | |
1464 | ||
1465 | (P) The internal pp_match() routine was called with invalid operational data. | |
1466 | ||
1467 | =item panic: do_split | |
1468 | ||
1469 | (P) Something terrible went wrong in setting up for the split. | |
1470 | ||
1471 | =item panic: do_subst | |
1472 | ||
1473 | (P) The internal pp_subst() routine was called with invalid operational data. | |
1474 | ||
1475 | =item panic: do_trans | |
1476 | ||
1477 | (P) The internal do_trans() routine was called with invalid operational data. | |
1478 | ||
1479 | =item panic: goto | |
1480 | ||
1481 | (P) We popped the context stack to a context with the specified label, | |
1482 | and then discovered it wasn't a context we know how to do a goto in. | |
1483 | ||
1484 | =item panic: INTERPCASEMOD | |
1485 | ||
1486 | (P) The lexer got into a bad state at a case modifier. | |
1487 | ||
1488 | =item panic: INTERPCONCAT | |
1489 | ||
1490 | (P) The lexer got into a bad state parsing a string with brackets. | |
1491 | ||
1492 | =item panic: last | |
1493 | ||
1494 | (P) We popped the context stack to a block context, and then discovered | |
1495 | it wasn't a block context. | |
1496 | ||
1497 | =item panic: leave_scope clearsv | |
1498 | ||
1499 | (P) A writable lexical variable became readonly somehow within the scope. | |
1500 | ||
1501 | =item panic: leave_scope inconsistency | |
1502 | ||
1503 | (P) The savestack probably got out of sync. At least, there was an | |
1504 | invalid enum on the top of it. | |
1505 | ||
1506 | =item panic: malloc | |
1507 | ||
1508 | (P) Something requested a negative number of bytes of malloc. | |
1509 | ||
1510 | =item panic: mapstart | |
1511 | ||
1512 | (P) The compiler is screwed up with respect to the map() function. | |
1513 | ||
1514 | =item panic: null array | |
1515 | ||
1516 | (P) One of the internal array routines was passed a null AV pointer. | |
1517 | ||
1518 | =item panic: pad_alloc | |
1519 | ||
1520 | (P) The compiler got confused about which scratch pad it was allocating | |
1521 | and freeing temporaries and lexicals from. | |
1522 | ||
1523 | =item panic: pad_free curpad | |
1524 | ||
1525 | (P) The compiler got confused about which scratch pad it was allocating | |
1526 | and freeing temporaries and lexicals from. | |
1527 | ||
1528 | =item panic: pad_free po | |
1529 | ||
1530 | (P) An invalid scratch pad offset was detected internally. | |
1531 | ||
1532 | =item panic: pad_reset curpad | |
1533 | ||
1534 | (P) The compiler got confused about which scratch pad it was allocating | |
1535 | and freeing temporaries and lexicals from. | |
1536 | ||
1537 | =item panic: pad_sv po | |
1538 | ||
1539 | (P) An invalid scratch pad offset was detected internally. | |
1540 | ||
1541 | =item panic: pad_swipe curpad | |
1542 | ||
1543 | (P) The compiler got confused about which scratch pad it was allocating | |
1544 | and freeing temporaries and lexicals from. | |
1545 | ||
1546 | =item panic: pad_swipe po | |
1547 | ||
1548 | (P) An invalid scratch pad offset was detected internally. | |
1549 | ||
1550 | =item panic: pp_iter | |
1551 | ||
1552 | (P) The foreach iterator got called in a non-loop context frame. | |
1553 | ||
1554 | =item panic: realloc | |
1555 | ||
1556 | (P) Something requested a negative number of bytes of realloc. | |
1557 | ||
1558 | =item panic: restartop | |
1559 | ||
1560 | (P) Some internal routine requested a goto (or something like it), and | |
1561 | didn't supply the destination. | |
1562 | ||
1563 | =item panic: return | |
1564 | ||
1565 | (P) We popped the context stack to a subroutine or eval context, and | |
1566 | then discovered it wasn't a subroutine or eval context. | |
1567 | ||
1568 | =item panic: scan_num | |
1569 | ||
1570 | (P) scan_num() got called on something that wasn't a number. | |
1571 | ||
1572 | =item panic: sv_insert | |
1573 | ||
1574 | (P) The sv_insert() routine was told to remove more string than there | |
1575 | was string. | |
1576 | ||
1577 | =item panic: top_env | |
1578 | ||
1579 | (P) The compiler attempted to do a goto, or something weird like that. | |
1580 | ||
1581 | =item panic: yylex | |
1582 | ||
1583 | (P) The lexer got into a bad state while processing a case modifier. | |
1584 | ||
1585 | =item Parens missing around "%s" list | |
1586 | ||
1587 | (W) You said something like | |
1588 | ||
1589 | my $foo, $bar = @_; | |
1590 | ||
1591 | when you meant | |
1592 | ||
1593 | my ($foo, $bar) = @_; | |
1594 | ||
1595 | Remember that "my" and "local" bind closer than comma. | |
1596 | ||
1597 | =item Perl %3.3f required--this is only version %s, stopped | |
1598 | ||
1599 | (F) The module in question uses features of a version of Perl more recent | |
1600 | than the currently running version. How long has it been since you upgraded, | |
1601 | anyway? See L<perlfunc/require>. | |
1602 | ||
1603 | =item Permission denied | |
1604 | ||
1605 | (F) The setuid emulator in suidperl decided you were up to no good. | |
1606 | ||
748a9306 LW |
1607 | =item pid %d not a child |
1608 | ||
1609 | (W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which | |
1610 | isn't a subprocess of the current process. While this is fine from VMS' | |
1611 | perspective, it's probably not what you intended. | |
1612 | ||
a0d0e21e LW |
1613 | =item POSIX getpgrp can't take an argument |
1614 | ||
1615 | (F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike | |
1616 | the BSD version, which takes a pid. | |
1617 | ||
1618 | =item Possible memory corruption: %s overflowed 3rd argument | |
1619 | ||
1620 | (F) An ioctl() or fcntl() returned more than Perl was bargaining for. | |
1621 | Perl guesses a reasonable buffer size, but puts a sentinel byte at the | |
1622 | end of the buffer just in case. This sentinel byte got clobbered, and | |
1623 | Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>. | |
1624 | ||
1625 | =item Precedence problem: open %s should be open(%s) | |
1626 | ||
1627 | (S) The old irregular construct | |
cb1a09d0 | 1628 | |
a0d0e21e LW |
1629 | open FOO || die; |
1630 | ||
1631 | is now misinterpreted as | |
1632 | ||
1633 | open(FOO || die); | |
1634 | ||
1635 | because of the strict regularization of Perl 5's grammar into unary and | |
1636 | list operators. (The old open was a little of both.) You must put | |
1637 | parens around the filehandle, or use the new "or" operator instead of "||". | |
1638 | ||
1639 | =item print on closed filehandle %s | |
1640 | ||
1641 | (W) The filehandle you're printing on got itself closed sometime before now. | |
1642 | Check your logic flow. | |
1643 | ||
1644 | =item printf on closed filehandle %s | |
1645 | ||
1646 | (W) The filehandle you're writing to got itself closed sometime before now. | |
1647 | Check your logic flow. | |
1648 | ||
1649 | =item Probable precedence problem on %s | |
1650 | ||
1651 | (W) The compiler found a bare word where it expected a conditional, | |
1652 | which often indicates that an || or && was parsed as part of the | |
1653 | last argument of the previous construct, for example: | |
1654 | ||
1655 | open FOO || die; | |
1656 | ||
4633a7c4 LW |
1657 | =item Prototype mismatch: (%s) vs (%s) |
1658 | ||
1659 | (S) The subroutine being defined had a predeclared (forward) declaration | |
1660 | with a different function prototype. | |
1661 | ||
8b1a09fc | 1662 | =item Read on closed filehandle E<lt>%sE<gt> |
a0d0e21e LW |
1663 | |
1664 | (W) The filehandle you're reading from got itself closed sometime before now. | |
1665 | Check your logic flow. | |
1666 | ||
1667 | =item Reallocation too large: %lx | |
1668 | ||
1669 | (F) You can't allocate more than 64K on an MSDOS machine. | |
1670 | ||
1671 | =item Recompile perl with B<-D>DEBUGGING to use B<-D> switch | |
1672 | ||
1673 | (F) You can't use the B<-D> option unless the code to produce the | |
1674 | desired output is compiled into Perl, which entails some overhead, | |
1675 | which is why it's currently left out of your copy. | |
1676 | ||
1677 | =item Recursive inheritance detected | |
1678 | ||
1679 | (F) More than 100 levels of inheritance were used. Probably indicates | |
1680 | an unintended loop in your inheritance hierarchy. | |
1681 | ||
1682 | =item Reference miscount in sv_replace() | |
1683 | ||
1684 | (W) The internal sv_replace() function was handed a new SV with a | |
1685 | reference count of other than 1. | |
1686 | ||
1687 | =item regexp memory corruption | |
1688 | ||
1689 | (P) The regular expression engine got confused by what the regular | |
1690 | expression compiler gave it. | |
1691 | ||
1692 | =item regexp out of space | |
1693 | ||
1694 | (P) A "can't happen" error, because safemalloc() should have caught it earlier. | |
1695 | ||
1696 | =item regexp too big | |
1697 | ||
2ba9eb46 | 1698 | (F) The current implementation of regular expressions uses shorts as |
a0d0e21e LW |
1699 | address offsets within a string. Unfortunately this means that if |
1700 | the regular expression compiles to longer than 32767, it'll blow up. | |
1701 | Usually when you want a regular expression this big, there is a better | |
1702 | way to do it with multiple statements. See L<perlre>. | |
1703 | ||
1704 | =item Reversed %s= operator | |
1705 | ||
1706 | (W) You wrote your assignment operator backwards. The = must always | |
1707 | comes last, to avoid ambiguity with subsequent unary operators. | |
1708 | ||
1709 | =item Runaway format | |
1710 | ||
1711 | (F) Your format contained the ~~ repeat-until-blank sequence, but it | |
1712 | produced 200 lines at once, and the 200th line looked exactly like the | |
1713 | 199th line. Apparently you didn't arrange for the arguments to exhaust | |
1714 | themselves, either by using ^ instead of @ (for scalar variables), or by | |
1715 | shifting or popping (for array variables). See L<perlform>. | |
1716 | ||
1717 | =item Scalar value @%s[%s] better written as $%s[%s] | |
1718 | ||
1719 | (W) You've used an array slice (indicated by @) to select a single value of | |
1720 | an array. Generally it's better to ask for a scalar value (indicated by $). | |
8b1a09fc | 1721 | The difference is that C<$foo[&bar]> always behaves like a scalar, both when |
1722 | assigning to it and when evaluating its argument, while C<@foo[&bar]> behaves | |
a0d0e21e LW |
1723 | like a list when you assign to it, and provides a list context to its |
1724 | subscript, which can do weird things if you're only expecting one subscript. | |
1725 | ||
748a9306 LW |
1726 | On the other hand, if you were actually hoping to treat the array |
1727 | element as a list, you need to look into how references work, since | |
1728 | Perl will not magically convert between scalars and lists for you. See | |
1729 | L<perlref>. | |
1730 | ||
a0d0e21e LW |
1731 | =item Script is not setuid/setgid in suidperl |
1732 | ||
1733 | (F) Oddly, the suidperl program was invoked on a script with its setuid | |
8b1a09fc | 1734 | or setgid bit not set. This doesn't make much sense. |
a0d0e21e LW |
1735 | |
1736 | =item Search pattern not terminated | |
1737 | ||
1738 | (F) The lexer couldn't find the final delimiter of a // or m{} | |
1739 | construct. Remember that bracketing delimiters count nesting level. | |
1740 | ||
1741 | =item seek() on unopened file | |
1742 | ||
1743 | (W) You tried to use the seek() function on a filehandle that was either | |
1744 | never opened or has been closed since. | |
1745 | ||
1746 | =item select not implemented | |
1747 | ||
1748 | (F) This machine doesn't implement the select() system call. | |
1749 | ||
1750 | =item sem%s not implemented | |
1751 | ||
1752 | (F) You don't have System V semaphore IPC on your system. | |
1753 | ||
1754 | =item semi-panic: attempt to dup freed string | |
1755 | ||
1756 | (S) The internal newSVsv() routine was called to duplicate a scalar | |
1757 | that had previously been marked as free. | |
1758 | ||
1759 | =item Semicolon seems to be missing | |
1760 | ||
1761 | (W) A nearby syntax error was probably caused by a missing semicolon, | |
1762 | or possibly some other missing operator, such as a comma. | |
1763 | ||
1764 | =item Send on closed socket | |
1765 | ||
1766 | (W) The filehandle you're sending to got itself closed sometime before now. | |
1767 | Check your logic flow. | |
1768 | ||
1769 | =item Sequence (?#... not terminated | |
1770 | ||
1771 | (F) A regular expression comment must be terminated by a closing | |
1772 | parenthesis. Embedded parens aren't allowed. See L<perlre>. | |
1773 | ||
1774 | =item Sequence (?%s...) not implemented | |
1775 | ||
1776 | (F) A proposed regular expression extension has the character reserved | |
1777 | but has not yet been written. See L<perlre>. | |
1778 | ||
1779 | =item Sequence (?%s...) not recognized | |
1780 | ||
1781 | (F) You used a regular expression extension that doesn't make sense. | |
1782 | See L<perlre>. | |
1783 | ||
a5f75d66 AD |
1784 | =item Server error |
1785 | ||
1786 | Also known as "500 Server error". This is a CGI error, not a Perl | |
1787 | error. You need to make sure your script is executable, is accessible | |
1788 | by the user CGI is running the script under (which is probably not | |
1789 | the user account you tested it under), does not rely on any environment | |
1790 | variables (like PATH) from the user it isn't running under, and isn't | |
1791 | in a location where the CGI server can't find it, basically, more or less. | |
1792 | ||
a0d0e21e LW |
1793 | =item setegid() not implemented |
1794 | ||
8b1a09fc | 1795 | (F) You tried to assign to C<$)>, and your operating system doesn't support |
a0d0e21e LW |
1796 | the setegid() system call (or equivalent), or at least Configure didn't |
1797 | think so. | |
1798 | ||
1799 | =item seteuid() not implemented | |
1800 | ||
8b1a09fc | 1801 | (F) You tried to assign to C<$E<gt>>, and your operating system doesn't support |
a0d0e21e LW |
1802 | the seteuid() system call (or equivalent), or at least Configure didn't |
1803 | think so. | |
1804 | ||
1805 | =item setrgid() not implemented | |
1806 | ||
8b1a09fc | 1807 | (F) You tried to assign to C<$(>, and your operating system doesn't support |
a0d0e21e LW |
1808 | the setrgid() system call (or equivalent), or at least Configure didn't |
1809 | think so. | |
1810 | ||
1811 | =item setruid() not implemented | |
1812 | ||
8b1a09fc | 1813 | (F) You tried to assign to C<$<lt>>, and your operating system doesn't support |
a0d0e21e LW |
1814 | the setruid() system call (or equivalent), or at least Configure didn't |
1815 | think so. | |
1816 | ||
1817 | =item Setuid/gid script is writable by world | |
1818 | ||
1819 | (F) The setuid emulator won't run a script that is writable by the world, | |
1820 | because the world might have written on it already. | |
1821 | ||
1822 | =item shm%s not implemented | |
1823 | ||
1824 | (F) You don't have System V shared memory IPC on your system. | |
1825 | ||
1826 | =item shutdown() on closed fd | |
1827 | ||
1828 | (W) You tried to do a shutdown on a closed socket. Seems a bit superfluous. | |
1829 | ||
1830 | =item SIG%s handler "%s" not defined. | |
1831 | ||
1832 | (W) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you | |
1833 | put it into the wrong package? | |
1834 | ||
1835 | =item sort is now a reserved word | |
1836 | ||
1837 | (F) An ancient error message that almost nobody ever runs into anymore. | |
1838 | But before sort was a keyword, people sometimes used it as a filehandle. | |
1839 | ||
1840 | =item Sort subroutine didn't return a numeric value | |
1841 | ||
1842 | (F) A sort comparison routine must return a number. You probably blew | |
4633a7c4 | 1843 | it by not using C<E<lt>=E<gt>> or C<cmp>, or by not using them correctly. |
a0d0e21e LW |
1844 | See L<perlfunc/sort>. |
1845 | ||
1846 | =item Sort subroutine didn't return single value | |
1847 | ||
1848 | (F) A sort comparison subroutine may not return a list value with more | |
1849 | or less than one element. See L<perlfunc/sort>. | |
1850 | ||
1851 | =item Split loop | |
1852 | ||
1853 | (P) The split was looping infinitely. (Obviously, a split shouldn't iterate | |
1854 | more times than there are characters of input, which is what happened.) | |
1855 | See L<perlfunc/split>. | |
1856 | ||
8b1a09fc | 1857 | =item Stat on unopened file E<lt>%sE<gt> |
a0d0e21e LW |
1858 | |
1859 | (W) You tried to use the stat() function (or an equivalent file test) | |
1860 | on a filehandle that was either never opened or has been closed since. | |
1861 | ||
1862 | =item Statement unlikely to be reached | |
1863 | ||
1864 | (W) You did an exec() with some statement after it other than a die(). | |
1865 | This is almost always an error, because exec() never returns unless | |
1866 | there was a failure. You probably wanted to use system() instead, | |
1867 | which does return. To suppress this warning, put the exec() in a block | |
1868 | by itself. | |
1869 | ||
1870 | =item Subroutine %s redefined | |
1871 | ||
1872 | (W) You redefined a subroutine. To suppress this warning, say | |
1873 | ||
1874 | { | |
1875 | local $^W = 0; | |
1876 | eval "sub name { ... }"; | |
1877 | } | |
1878 | ||
1879 | =item Substitution loop | |
1880 | ||
1881 | (P) The substitution was looping infinitely. (Obviously, a | |
1882 | substitution shouldn't iterate more times than there are characters of | |
1883 | input, which is what happened.) See the discussion of substitution in | |
1884 | L<perlop/"Quote and Quotelike Operators">. | |
1885 | ||
1886 | =item Substitution pattern not terminated | |
1887 | ||
1888 | (F) The lexer couldn't find the interior delimiter of a s/// or s{}{} | |
1889 | construct. Remember that bracketing delimiters count nesting level. | |
1890 | ||
1891 | =item Substitution replacement not terminated | |
1892 | ||
1893 | (F) The lexer couldn't find the final delimiter of a s/// or s{}{} | |
1894 | construct. Remember that bracketing delimiters count nesting level. | |
1895 | ||
1896 | =item substr outside of string | |
1897 | ||
1898 | (W) You tried to reference a substr() that pointed outside of a string. | |
1899 | That is, the absolute value of the offset was larger than the length of | |
1900 | the string. See L<perlfunc/substr>. | |
1901 | ||
1902 | =item suidperl is no longer needed since... | |
1903 | ||
1904 | (F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but a | |
1905 | version of the setuid emulator somehow got run anyway. | |
1906 | ||
1907 | =item syntax error | |
1908 | ||
1909 | (F) Probably means you had a syntax error. Common reasons include: | |
1910 | ||
1911 | A keyword is misspelled. | |
1912 | A semicolon is missing. | |
1913 | A comma is missing. | |
1914 | An opening or closing parenthesis is missing. | |
1915 | An opening or closing brace is missing. | |
1916 | A closing quote is missing. | |
1917 | ||
1918 | Often there will be another error message associated with the syntax | |
1919 | error giving more information. (Sometimes it helps to turn on B<-w>.) | |
1920 | The error message itself often tells you where it was in the line when | |
1921 | it decided to give up. Sometimes the actual error is several tokens | |
1922 | before this, since Perl is good at understanding random input. | |
1923 | Occasionally the line number may be misleading, and once in a blue moon | |
1924 | the only way to figure out what's triggering the error is to call | |
1925 | C<perl -c> repeatedly, chopping away half the program each time to see | |
1926 | if the error went away. Sort of the cybernetic version of S<20 questions>. | |
1927 | ||
cb1a09d0 AD |
1928 | =item syntax error at line %d: `%s' unexpected |
1929 | ||
8b1a09fc | 1930 | (A) You've accidentally run your script through the Bourne shell |
1931 | instead of Perl. Check the E<lt>#!E<gt> line, or manually feed your script | |
cb1a09d0 AD |
1932 | into Perl yourself. |
1933 | ||
a0d0e21e LW |
1934 | =item System V IPC is not implemented on this machine |
1935 | ||
1936 | (F) You tried to do something with a function beginning with "sem", "shm" | |
1937 | or "msg". See L<perlfunc/semctl>, for example. | |
1938 | ||
1939 | =item Syswrite on closed filehandle | |
1940 | ||
1941 | (W) The filehandle you're writing to got itself closed sometime before now. | |
1942 | Check your logic flow. | |
1943 | ||
1944 | =item tell() on unopened file | |
1945 | ||
1946 | (W) You tried to use the tell() function on a filehandle that was either | |
1947 | never opened or has been closed since. | |
1948 | ||
8b1a09fc | 1949 | =item Test on unopened file E<lt>%sE<gt> |
a0d0e21e LW |
1950 | |
1951 | (W) You tried to invoke a file test operator on a filehandle that isn't | |
1952 | open. Check your logic. See also L<perlfunc/-X>. | |
1953 | ||
1954 | =item That use of $[ is unsupported | |
1955 | ||
8b1a09fc | 1956 | (F) Assignment to C<$[> is now strictly circumscribed, and interpreted as |
a0d0e21e LW |
1957 | a compiler directive. You may only say one of |
1958 | ||
1959 | $[ = 0; | |
1960 | $[ = 1; | |
1961 | ... | |
1962 | local $[ = 0; | |
1963 | local $[ = 1; | |
1964 | ... | |
1965 | ||
1966 | This is to prevent the problem of one module changing the array base | |
1967 | out from under another module inadvertently. See L<perlvar/$[>. | |
1968 | ||
1969 | =item The %s function is unimplemented | |
1970 | ||
1971 | The function indicated isn't implemented on this architecture, according | |
1972 | to the probings of Configure. | |
1973 | ||
1974 | =item The crypt() function is unimplemented due to excessive paranoia. | |
1975 | ||
1976 | (F) Configure couldn't find the crypt() function on your machine, | |
1977 | probably because your vendor didn't supply it, probably because they | |
8b1a09fc | 1978 | think the U.S. Government thinks it's a secret, or at least that they |
a0d0e21e LW |
1979 | will continue to pretend that it is. And if you quote me on that, I |
1980 | will deny it. | |
1981 | ||
1982 | =item The stat preceding C<-l _> wasn't an lstat | |
1983 | ||
1984 | (F) It makes no sense to test the current stat buffer for symbolic linkhood | |
1985 | if the last stat that wrote to the stat buffer already went past | |
1986 | the symlink to get to the real file. Use an actual filename instead. | |
1987 | ||
1988 | =item times not implemented | |
1989 | ||
1990 | (F) Your version of the C library apparently doesn't do times(). I suspect | |
1991 | you're not running on Unix. | |
1992 | ||
1993 | =item Too few args to syscall | |
1994 | ||
1995 | (F) There has to be at least one argument to syscall() to specify the | |
1996 | system call to call, silly dilly. | |
1997 | ||
cb1a09d0 AD |
1998 | =item Too many ('s |
1999 | ||
2000 | =item Too many )'s | |
2001 | ||
2002 | (A) You've accidentally run your script through B<csh> instead | |
8b1a09fc | 2003 | of Perl. Check the E<lt>#!E<gt> line, or manually feed your script |
cb1a09d0 AD |
2004 | into Perl yourself. |
2005 | ||
a0d0e21e LW |
2006 | =item Too many args to syscall |
2007 | ||
2008 | (F) Perl only supports a maximum of 14 args to syscall(). | |
2009 | ||
2010 | =item Too many arguments for %s | |
2011 | ||
2012 | (F) The function requires fewer arguments than you specified. | |
2013 | ||
2014 | =item trailing \ in regexp | |
2015 | ||
2016 | (F) The regular expression ends with an unbackslashed backslash. Backslash | |
2017 | it. See L<perlre>. | |
2018 | ||
2019 | =item Translation pattern not terminated | |
2020 | ||
2021 | (F) The lexer couldn't find the interior delimiter of a tr/// or tr[][] | |
2022 | construct. | |
2023 | ||
2024 | =item Translation replacement not terminated | |
2025 | ||
2026 | (F) The lexer couldn't find the final delimiter of a tr/// or tr[][] | |
2027 | construct. | |
2028 | ||
2029 | =item truncate not implemented | |
2030 | ||
2031 | (F) Your machine doesn't implement a file truncation mechanism that | |
2032 | Configure knows about. | |
2033 | ||
2034 | =item Type of arg %d to %s must be %s (not %s) | |
2035 | ||
2036 | (F) This function requires the argument in that position to be of a | |
8b1a09fc | 2037 | certain type. Arrays must be @NAME or C<@{EXPR}>. Hashes must be |
2038 | %NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the | |
a0d0e21e LW |
2039 | {EXPR} forms as an explicit dereference. See L<perlref>. |
2040 | ||
2041 | =item umask: argument is missing initial 0 | |
2042 | ||
2043 | (W) A umask of 222 is incorrect. It should be 0222, since octal literals | |
2044 | always start with 0 in Perl, as in C. | |
2045 | ||
4633a7c4 LW |
2046 | =item Unable to create sub named "%s" |
2047 | ||
2048 | (F) You attempted to create or access a subroutine with an illegal name. | |
2049 | ||
a0d0e21e LW |
2050 | =item Unbalanced context: %d more PUSHes than POPs |
2051 | ||
2052 | (W) The exit code detected an internal inconsistency in how many execution | |
2053 | contexts were entered and left. | |
2054 | ||
2055 | =item Unbalanced saves: %d more saves than restores | |
2056 | ||
2057 | (W) The exit code detected an internal inconsistency in how many | |
2058 | values were temporarily localized. | |
2059 | ||
2060 | =item Unbalanced scopes: %d more ENTERs than LEAVEs | |
2061 | ||
2062 | (W) The exit code detected an internal inconsistency in how many blocks | |
2063 | were entered and left. | |
2064 | ||
2065 | =item Unbalanced tmps: %d more allocs than frees | |
2066 | ||
2067 | (W) The exit code detected an internal inconsistency in how many mortal | |
2068 | scalars were allocated and freed. | |
2069 | ||
2070 | =item Undefined format "%s" called | |
2071 | ||
2072 | (F) The format indicated doesn't seem to exist. Perhaps it's really in | |
2073 | another package? See L<perlform>. | |
2074 | ||
2075 | =item Undefined sort subroutine "%s" called | |
2076 | ||
2077 | (F) The sort comparison routine specified doesn't seem to exist. Perhaps | |
2078 | it's in a different package? See L<perlfunc/sort>. | |
2079 | ||
2080 | =item Undefined subroutine &%s called | |
2081 | ||
2082 | (F) The subroutine indicated hasn't been defined, or if it was, it | |
2083 | has since been undefined. | |
2084 | ||
2085 | =item Undefined subroutine called | |
2086 | ||
2087 | (F) The anonymous subroutine you're trying to call hasn't been defined, | |
2088 | or if it was, it has since been undefined. | |
2089 | ||
2090 | =item Undefined subroutine in sort | |
2091 | ||
2092 | (F) The sort comparison routine specified is declared but doesn't seem to | |
2093 | have been defined yet. See L<perlfunc/sort>. | |
2094 | ||
4633a7c4 LW |
2095 | =item Undefined top format "%s" called |
2096 | ||
2097 | (F) The format indicated doesn't seem to exist. Perhaps it's really in | |
2098 | another package? See L<perlform>. | |
2099 | ||
a0d0e21e LW |
2100 | =item unexec of %s into %s failed! |
2101 | ||
2102 | (F) The unexec() routine failed for some reason. See your local FSF | |
2103 | representative, who probably put it there in the first place. | |
2104 | ||
2105 | =item Unknown BYTEORDER | |
2106 | ||
2107 | (F) There are no byteswapping functions for a machine with this byte order. | |
2108 | ||
2109 | =item unmatched () in regexp | |
2110 | ||
2111 | (F) Unbackslashed parentheses must always be balanced in regular | |
2112 | expressions. If you're a vi user, the % key is valuable for finding | |
2113 | the matching paren. See L<perlre>. | |
2114 | ||
2115 | =item Unmatched right bracket | |
2116 | ||
2117 | (F) The lexer counted more closing curly brackets (braces) than opening | |
2118 | ones, so you're probably missing an opening bracket. As a general | |
2119 | rule, you'll find the missing one (so to speak) near the place you were | |
2120 | last editing. | |
2121 | ||
2122 | =item unmatched [] in regexp | |
2123 | ||
2124 | (F) The brackets around a character class must match. If you wish to | |
2125 | include a closing bracket in a character class, backslash it or put it first. | |
2126 | See L<perlre>. | |
2127 | ||
2128 | =item Unquoted string "%s" may clash with future reserved word | |
2129 | ||
2130 | (W) You used a bare word that might someday be claimed as a reserved word. | |
2131 | It's best to put such a word in quotes, or capitalize it somehow, or insert | |
2132 | an underbar into it. You might also declare it as a subroutine. | |
2133 | ||
2134 | =item Unrecognized character \%03o ignored | |
2135 | ||
2136 | (S) A garbage character was found in the input, and ignored, in case it's | |
2137 | a weird control character on an EBCDIC machine, or some such. | |
2138 | ||
2139 | =item Unrecognized signal name "%s" | |
2140 | ||
2141 | (F) You specified a signal name to the kill() function that was not recognized. | |
2142 | Say C<kill -l> in your shell to see the valid signal names on your system. | |
2143 | ||
2144 | =item Unrecognized switch: -%s | |
2145 | ||
2146 | (F) You specified an illegal option to Perl. Don't do that. | |
2147 | (If you think you didn't do that, check the #! line to see if it's | |
2148 | supplying the bad switch on your behalf.) | |
2149 | ||
2150 | =item Unsuccessful %s on filename containing newline | |
2151 | ||
2152 | (W) A file operation was attempted on a filename, and that operation | |
2153 | failed, PROBABLY because the filename contained a newline, PROBABLY | |
2154 | because you forgot to chop() or chomp() it off. See L<perlfunc/chop>. | |
2155 | ||
2156 | =item Unsupported directory function "%s" called | |
2157 | ||
2158 | (F) Your machine doesn't support opendir() and readdir(). | |
2159 | ||
2160 | =item Unsupported function %s | |
2161 | ||
2162 | (F) This machines doesn't implement the indicated function, apparently. | |
2163 | At least, Configure doesn't think so. | |
2164 | ||
2165 | =item Unsupported socket function "%s" called | |
2166 | ||
2167 | (F) Your machine doesn't support the Berkeley socket mechanism, or at | |
2168 | least that's what Configure thought. | |
2169 | ||
8b1a09fc | 2170 | =item Unterminated E<lt>E<gt> operator |
a0d0e21e LW |
2171 | |
2172 | (F) The lexer saw a left angle bracket in a place where it was expecting | |
2173 | a term, so it's looking for the corresponding right angle bracket, and not | |
2174 | finding it. Chances are you left some needed parentheses out earlier in | |
2175 | the line, and you really meant a "less than". | |
2176 | ||
2177 | =item Use of $# is deprecated | |
2178 | ||
8b1a09fc | 2179 | (D) This was an ill-advised attempt to emulate a poorly defined B<awk> feature. |
a0d0e21e LW |
2180 | Use an explicit printf() or sprintf() instead. |
2181 | ||
2182 | =item Use of $* is deprecated | |
2183 | ||
2184 | (D) This variable magically turned on multiline pattern matching, both for | |
2185 | you and for any luckless subroutine that you happen to call. You should | |
2186 | use the new C<//m> and C<//s> modifiers now to do that without the dangerous | |
2187 | action-at-a-distance effects of C<$*>. | |
2188 | ||
748a9306 LW |
2189 | =item Use of %s in printf format not supported |
2190 | ||
2191 | (F) You attempted to use a feature of printf that is accessible only | |
2192 | from C. This usually means there's a better way to do it in Perl. | |
2193 | ||
a0d0e21e LW |
2194 | =item Use of %s is deprecated |
2195 | ||
2196 | (D) The construct indicated is no longer recommended for use, generally | |
2197 | because there's a better way to do it, and also because the old way has | |
2198 | bad side effects. | |
2199 | ||
8b1a09fc | 2200 | =item Use of bare E<lt>E<lt> to mean E<lt>E<lt>"" is deprecated |
4633a7c4 LW |
2201 | |
2202 | (D) You are now encouraged to use the explicitly quoted form if you | |
2203 | wish to use a blank line as the terminator of the here-document. | |
2204 | ||
a0d0e21e LW |
2205 | =item Use of implicit split to @_ is deprecated |
2206 | ||
2207 | (D) It makes a lot of work for the compiler when you clobber a | |
2208 | subroutine's argument list, so it's better if you assign the results of | |
2209 | a split() explicitly to an array (or list). | |
2210 | ||
2211 | =item Use of uninitialized value | |
2212 | ||
2213 | (W) An undefined value was used as if it were already defined. It was | |
2214 | interpreted as a "" or a 0, but maybe it was a mistake. To suppress this | |
2215 | warning assign an initial value to your variables. | |
2216 | ||
2217 | =item Useless use of %s in void context | |
2218 | ||
2219 | (W) You did something without a side effect in a context that does nothing | |
2220 | with the return value, such as a statement that doesn't return a value | |
2221 | from a block, or the left side of a scalar comma operator. Very often | |
2222 | this points not to stupidity on your part, but a failure of Perl to parse | |
2223 | your program the way you thought it would. For example, you'd get this | |
2224 | if you mixed up your C precedence with Python precedence and said | |
2225 | ||
2226 | $one, $two = 1, 2; | |
2227 | ||
2228 | when you meant to say | |
2229 | ||
2230 | ($one, $two) = (1, 2); | |
2231 | ||
748a9306 LW |
2232 | Another common error is to use ordinary parentheses to construct a list |
2233 | reference when you should be using square or curly brackets, for | |
2234 | example, if you say | |
2235 | ||
2236 | $array = (1,2); | |
2237 | ||
2238 | when you should have said | |
2239 | ||
2240 | $array = [1,2]; | |
2241 | ||
2242 | The square brackets explicitly turn a list value into a scalar value, | |
2243 | while parentheses do not. So when a parenthesized list is evaluated in | |
2244 | a scalar context, the comma is treated like C's comma operator, which | |
2245 | throws away the left argument, which is not what you want. See | |
2246 | L<perlref> for more on this. | |
2247 | ||
4633a7c4 LW |
2248 | =item Variable "%s" is not exported |
2249 | ||
2250 | (F) While "use strict" in effect, you referred to a global variable | |
2251 | that you apparently thought was imported from another module, because | |
2252 | something else of the same name (usually a subroutine) is exported | |
2253 | by that module. It usually means you put the wrong funny character | |
2254 | on the front of your variable. | |
2255 | ||
cb1a09d0 AD |
2256 | =item Variable syntax. |
2257 | ||
2258 | (A) You've accidentally run your script through B<csh> instead | |
8b1a09fc | 2259 | of Perl. Check the E<lt>#!E<gt> line, or manually feed your script |
cb1a09d0 AD |
2260 | into Perl yourself. |
2261 | ||
a0d0e21e LW |
2262 | =item Warning: unable to close filehandle %s properly. |
2263 | ||
8b1a09fc | 2264 | (S) The implicit close() done by an open() got an error indication on the |
2ba9eb46 | 2265 | close(). This usually indicates your filesystem ran out of disk space. |
a0d0e21e LW |
2266 | |
2267 | =item Warning: Use of "%s" without parens is ambiguous | |
2268 | ||
2269 | (S) You wrote a unary operator followed by something that looks like a | |
2270 | binary operator that could also have been interpreted as a term or | |
2271 | unary operator. For instance, if you know that the rand function | |
2272 | has a default argument of 1.0, and you write | |
2273 | ||
2274 | rand + 5; | |
2275 | ||
2276 | you may THINK you wrote the same thing as | |
2277 | ||
2278 | rand() + 5; | |
2279 | ||
2280 | but in actual fact, you got | |
2281 | ||
2282 | rand(+5); | |
2283 | ||
2284 | So put in parens to say what you really mean. | |
2285 | ||
2286 | =item Write on closed filehandle | |
2287 | ||
2288 | (W) The filehandle you're writing to got itself closed sometime before now. | |
2289 | Check your logic flow. | |
2290 | ||
2291 | =item X outside of string | |
2292 | ||
2293 | (F) You had a pack template that specified a relative position before | |
2294 | the beginning of the string being unpacked. See L<perlfunc/pack>. | |
2295 | ||
2296 | =item x outside of string | |
2297 | ||
2298 | (F) You had a pack template that specified a relative position after | |
2299 | the end of the string being unpacked. See L<perlfunc/pack>. | |
2300 | ||
2301 | =item Xsub "%s" called in sort | |
2302 | ||
2303 | (F) The use of an external subroutine as a sort comparison is not yet supported. | |
2304 | ||
2305 | =item Xsub called in sort | |
2306 | ||
2307 | (F) The use of an external subroutine as a sort comparison is not yet supported. | |
2308 | ||
2309 | =item You can't use C<-l> on a filehandle | |
2310 | ||
2311 | (F) A filehandle represents an opened file, and when you opened the file it | |
2312 | already went past any symlink you are presumably trying to look for. | |
2313 | Use a filename instead. | |
2314 | ||
2315 | =item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET! | |
2316 | ||
2317 | (F) And you probably never will, since you probably don't have the | |
2318 | sources to your kernel, and your vendor probably doesn't give a rip | |
2319 | about what you want. Your best bet is to use the wrapsuid script in | |
2320 | the eg directory to put a setuid C wrapper around your script. | |
2321 | ||
2322 | =item You need to quote "%s" | |
2323 | ||
2324 | (W) You assigned a bareword as a signal handler name. Unfortunately, you | |
2325 | already have a subroutine of that name declared, which means that Perl 5 | |
2326 | will try to call the subroutine when the assignment is executed, which is | |
2327 | probably not what you want. (If it IS what you want, put an & in front.) | |
2328 | ||
2329 | =item [gs]etsockopt() on closed fd | |
2330 | ||
2331 | (W) You tried to get or set a socket option on a closed socket. | |
2332 | Did you forget to check the return value of your socket() call? | |
2333 | See L<perlfunc/getsockopt>. | |
2334 | ||
2335 | =item \1 better written as $1 | |
2336 | ||
2337 | (W) Outside of patterns, backreferences live on as variables. The use | |
2338 | of backslashes is grandfathered on the righthand side of a | |
2339 | substitution, but stylistically it's better to use the variable form | |
2340 | because other Perl programmers will expect it, and it works better | |
2341 | if there are more than 9 backreferences. | |
2342 | ||
8b1a09fc | 2343 | =item '|' and 'E<lt>' may not both be specified on command line |
748a9306 LW |
2344 | |
2345 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
2346 | found that STDIN was a pipe, and that you also tried to redirect STDIN using | |
8b1a09fc | 2347 | 'E<lt>'. Only one STDIN stream to a customer, please. |
748a9306 | 2348 | |
8b1a09fc | 2349 | =item '|' and 'E<gt>' may not both be specified on command line |
748a9306 LW |
2350 | |
2351 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
2352 | thinks you tried to redirect stdout both to a file and into a pipe to another | |
2353 | command. You need to choose one or the other, though nothing's stopping you | |
2354 | from piping into a program or Perl script which 'splits' output into two | |
2355 | streams, such as | |
2356 | ||
2357 | open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!"; | |
2358 | while (<STDIN>) { | |
2359 | print; | |
2360 | print OUT; | |
2361 | } | |
2362 | close OUT; | |
2363 | ||
a0d0e21e LW |
2364 | =back |
2365 |