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1 | =head1 NAME |
2 | |
3 | perldelta - what's new for perl5.005 |
4 | |
5 | =head1 DESCRIPTION |
6 | |
7 | This document describes differences between the 5.004 release and this one. |
8 | |
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9 | [XXX this needs more verbose summaries of the sub topics, instead of just |
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10 | the "See foo." Scheduled for a second iteration. GSAR] |
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11 | |
12 | =head1 About the new versioning system |
13 | |
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14 | =head1 Incompatible Changes |
15 | |
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16 | =head2 WARNING: This version is not binary compatible with Perl 5.004. |
17 | |
18 | Starting with Perl 5.004_50 there were many deep and far-reaching changes |
19 | to the language internals. If you have dynamically loaded extensions |
20 | that you built under perl 5.003 or 5.004, you can continue to use them |
21 | with 5.004, but you will need to rebuild and reinstall those extensions |
22 | to use them 5.005. See L<INSTALL> for detailed instructions on how to |
23 | upgrade. |
24 | |
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25 | =head2 Default installation structure has changed |
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26 | |
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27 | The new Configure defaults are designed to allow a smooth upgrade from |
28 | 5.004 to 5.005, but you should read L<INSTALL> for a detailed |
29 | discussion of the changes in order to adapt them to your system. |
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30 | |
31 | =head2 Perl Source Compatibility |
32 | |
33 | When none of the experimental features are enabled, there should be |
34 | no user-visible Perl source compatibility issue. |
35 | |
36 | If threads are enabled, then some caveats apply. C<@_> and C<$_> become |
37 | lexical variables. The effect of this should be largely transparent to |
38 | the user, but there are some boundary conditions under which user will |
39 | need to be aware of the issues. [XXX Add e.g. here.] |
40 | |
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41 | Some new keywords have been introduced. These are generally expected to |
42 | have very little impact on compatibility. See L</New C<INIT> keyword>, |
43 | L</New C<lock> keyword>, and L</New C<qr//> operator>. |
44 | |
45 | Certain barewords are now reserved. Use of these will provoke a warning |
46 | if you have asked for them with the C<-w> switch. |
47 | See L</C<our> is now a reserved word>. |
48 | |
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49 | =head2 C Source Compatibility |
50 | |
51 | =item Core sources now require ANSI C compiler |
52 | |
53 | =item Enabling threads has source compatibility issues |
54 | |
55 | =head2 Binary Compatibility |
56 | |
57 | This version is NOT binary compatible with older versions. All extensions |
58 | will need to be recompiled. |
59 | |
60 | =head2 Security fixes may affect compatibility |
61 | |
62 | A few taint leaks and taint omissions have been corrected. This may lead |
63 | to "failure" of scripts that used to work with older versions. Compiling |
64 | with -DINCOMPLETE_TAINTS provides a perl with minimal amounts of changes |
65 | to the tainting behavior. But note that the resulting perl will have |
66 | known insecurities. |
67 | |
68 | Oneliners with the C<-e> switch do not create temporary files anymore. |
69 | |
70 | =head2 Relaxed new mandatory warnings introduced in 5.004 |
71 | |
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72 | Many new warnings that were introduced in 5.004 have been made |
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73 | optional. Some of these warnings are still present, but perl's new |
74 | features make them less often a problem. See L<New Diagnostics>. |
75 | |
76 | =head2 Licensing |
77 | |
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78 | Perl has a new Social Contract for contributors. See F<Porting/Contract>. |
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79 | |
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80 | The license included in much of the Perl documentation has changed. |
81 | [XXX See where?] |
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82 | |
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83 | =head1 Core Changes |
84 | |
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85 | |
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86 | =head2 Threads |
87 | |
88 | WARNING: Threading is considered an experimental feature. Details of the |
89 | implementation may change without notice. There are known limitations |
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90 | and and some bugs. |
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91 | |
92 | See L<README.threads>. |
93 | |
94 | =head2 Compiler |
95 | |
96 | WARNING: The Compiler and related tools are considered experimental. |
97 | Features may change without notice, and there are known limitations |
98 | and bugs. |
99 | |
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100 | The Compiler produces three different types of transformations of a |
101 | perl program. The C backend generates C code that captures perl's state |
102 | just before execution begins. It eliminates the compile-time overheads |
103 | of the regular perl interpreter, but the run-time performance remains |
104 | comparatively the same. The CC backend generates optimized C code |
105 | equivivalent to the code path at run-time. The CC backend has greater |
106 | potential for big optimizations, but only a few optimizations are |
107 | implemented currently. The Bytecode backend generates a platform |
108 | independent bytecode representation of the interpreter's state |
109 | just before execution. Thus, the Bytecode back end also eliminates |
110 | much of the compilation overhead of the interpreter. |
111 | |
112 | The compiler comes with several valuable utilities. |
113 | |
114 | C<B::Lint> is an experimental module to detect and warn about suspicious |
115 | code, especially the cases that the C<-w> switch does not detect. |
116 | |
117 | C<B::Deparse> can be used to demystify perl code, and understand |
118 | how perl optimizes certain constructs. |
119 | |
120 | C<B::Xref> generates cross reference reports of all definition and use |
121 | of variables, subroutines and formats in a program. |
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122 | |
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123 | C<B::Showlex> show the lexical variables used by a subroutine or file |
124 | at a glance. |
125 | |
126 | C<perlcc> is a simple frontend for compiling perl. |
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127 | |
128 | See C<ext/B/README>. |
129 | |
130 | =head2 Regular Expressions |
131 | |
132 | See L<perlre> and L<perlop>. |
133 | |
134 | =head2 Improved malloc() |
135 | |
136 | See banner at the beginning of C<malloc.c> for details. |
137 | |
138 | =head2 Quicksort is internally implemented |
139 | |
140 | See C<perlfunc/sort>. |
141 | |
142 | =head2 Reliable signals |
143 | |
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144 | Two kinds. |
145 | |
146 | Via C<Thread::Signal>. |
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147 | |
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148 | Via switched runtime op loop. [XXX Not yet available.] |
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149 | |
150 | =head2 Reliable stack pointers |
151 | |
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152 | The internals now reallocate the perl stack only at predictable times. |
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153 | In particular, magic calls never trigger reallocations of the stack, |
154 | because all reentrancy of the runtime is handled using a "stack of stacks". |
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155 | This should improve reliability of cached stack pointers in the internals |
156 | and in XSUBs. |
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157 | |
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158 | =head2 Behavior of local() on array and hash elements is now well-defined |
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159 | |
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160 | See L<perlsub/"Temporary Values via local()">. |
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161 | |
162 | =head2 C<%!> is transparently tied to the L<Errno> module |
163 | |
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164 | See L<perlvar>, and L<Errno>. |
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165 | |
166 | =head2 Pseudo-hashes are supported |
167 | |
168 | See L<perlref>. |
169 | |
170 | =head2 C<EXPR foreach EXPR> is supported |
171 | |
172 | See L<perlsyn>. |
173 | |
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174 | =head2 Keywords can be globally overridden |
175 | |
176 | See L<perlsub>. |
177 | |
178 | =head2 C<$^E> is meaningful on Win32 |
179 | |
180 | See L<perlvar>. |
181 | |
182 | =head2 C<foreach (1..1000000)> optimized |
183 | |
184 | C<foreach (1..1000000)> is now optimized into a counting loop. It does |
185 | not try to allocate a 1000000-size list anymore. |
186 | |
187 | =head2 C<Foo::> can be used as implicitly quoted package name |
188 | |
189 | [XXX See what?] |
190 | |
191 | =head2 C<exists $Foo::{Bar::}> tests existence of a package |
192 | |
193 | [XXX See what?] |
194 | |
195 | =head2 Better locale support |
196 | |
197 | See L<perllocale>. |
198 | |
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199 | =head2 Experimental support for 64-bit platforms |
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200 | |
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201 | Perl5 has always had 64-bit support on systems with 64-bit longs. |
202 | Starting with 5.005, the beginnings of experimental support for systems |
203 | with 32-bit long and 64-bit 'long long' integers has been added. |
204 | If you add -DUSE_LONG_LONG to your ccflags in config.sh (or manually |
205 | define it in perl.h) then perl will be built with 'long long' support. |
206 | There will be many compiler warnings, and the resultant perl may not |
207 | work on all systems. There are many other issues related to |
208 | third-party extensions and libraries. This option exists to allow |
209 | people to work on those issues. |
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210 | |
211 | =head2 prototype() returns useful results on builtins |
212 | |
213 | See L<perlfunc/prototype>. |
214 | |
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215 | =head2 Extended support for exception handling |
216 | |
217 | C<die()> now accepts a reference value, and C<$@> gets set to that |
218 | value in exception traps. This makes it possible to propagate |
219 | exception objects. See L<perlfunc/eval>. [XXX there's nothing |
220 | about this in perlfunc/eval yet.] |
221 | |
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222 | =head2 Re-blessing in DESTROY() supported for chaining DESTROY() methods |
223 | |
224 | See L<perlobj/Destructors>. |
225 | |
226 | =head2 All C<printf> format conversions are handled internally |
227 | |
228 | See L<perlfunc/printf>. |
229 | |
230 | =head2 New C<INIT> keyword |
231 | |
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232 | C<INIT> subs are like C<BEGIN> and C<END>, but they get run just before |
233 | the perl runtime begins execution. e.g., the Perl Compiler makes use of |
234 | C<INIT> blocks to initialize and resolve pointers to XSUBs. |
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235 | |
236 | [XXX Needs to be documented in perlsub or perlmod.] |
237 | |
238 | =head2 New C<lock> keyword |
239 | |
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240 | The C<lock> keyword is the fundamental synchronization primitive |
241 | in threaded perl. When threads are not enabled, it is currently a noop. |
242 | |
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243 | To minimize impact on source compatibility this keyword is "weak", i.e., any |
244 | user-defined subroutine of the same name overrides it, unless a C<use Thread> |
245 | has been seen. |
246 | |
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247 | =head2 New C<qr//> operator |
248 | |
249 | The C<qr//> operator, which is syntactically similar to the other quote-like |
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250 | operators, is used to create precompiled regular expressions. This compiled |
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251 | form can now be explicitly passed around in variables, and interpolated in |
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252 | other regular expressions. See L<perlop>. |
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253 | |
254 | =head2 C<our> is now a reserved word |
255 | |
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256 | =head2 Tied arrays are now fully supported |
257 | |
258 | See L<Tie::Array>. |
259 | |
260 | =head2 Tied handles support is better |
261 | |
262 | Several missing hooks have been added. There is also a new base class for |
263 | TIEARRAY implementations. See L<Tie::Array>. |
264 | |
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265 | =head2 4th argument to substr |
266 | |
267 | substr() can now both return and replace in one operation. The optional |
268 | 4th argument is the replacement string. See L<perlfunc/substr>. |
269 | |
270 | =head2 Negative LENGTH argument to splice |
271 | |
272 | Splice() with a negative LENGTH argument now work similar to what the |
273 | LENGTH did for substr(). Previously a negative LENGTH was treated as |
274 | 0. See L<perlfunc/splice>. |
275 | |
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276 | =head2 Magic lvalues are now more magical |
277 | |
278 | When you say something like C<substr($x, 5) = "hi">, the scalar returned |
279 | by substr() is special, in that any modifications to it affect $x. |
280 | (This is called a 'magic lvalue' because an 'lvalue' is something on |
281 | the left side of an assignment.) Normally, this is exactly what you |
282 | would expect to happen, but Perl uses the same magic if you use substr(), |
283 | pos(), or vec() in a context where they might be modified, like taking |
284 | a reference with C<\> or as an argument to a sub that modifies C<@_>. |
285 | In previous versions, this 'magic' only went one way, but now changes |
286 | to the scalar the magic refers to ($x in the above example) affect the |
287 | magic lvalue too. For instance, this code now acts differently: |
288 | |
289 | $x = "hello"; |
290 | sub printit { |
291 | $x = "g'bye"; |
292 | print $_[0], "\n"; |
293 | } |
294 | printit(substr($x, 0, 5)); |
295 | |
296 | In previous versions, this would print "hello", but it now prints "g'bye". |
297 | |
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298 | =head2 E<lt>E<gt> now reads in records |
299 | |
300 | If C<$/> is a referenence to an integer, or a scalar that holds an integer, |
301 | E<lt>E<gt> will read in records instead of lines. For more info, see |
302 | L<perlvar/$/>. |
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303 | |
304 | =head1 Supported Platforms |
305 | |
306 | Configure has many incremental improvements. Site-wide policy for building |
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307 | perl can now be made persistent, via Policy.sh. Configure also records |
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308 | the command-line arguments used in F<config.sh>. |
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309 | |
310 | =head2 New Platforms |
311 | |
312 | BeOS is now supported. See L<README.beos>. |
313 | |
314 | DOS is now supported under the DJGPP tools. See L<README.dos>. |
315 | |
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316 | MPE/iX is now supported. See L<README.mpeix>. |
317 | |
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318 | =head2 Changes in existing support |
319 | |
320 | Win32 support has been vastly enhanced. Support for Perl Object, a C++ |
321 | encapsulation of Perl. GCC and EGCS are now supported on Win32. |
322 | [XXX Perl Object needs a big explanation elsewhere, and a pointer to |
323 | that location here.] |
324 | |
325 | VMS configuration system has been rewritten. See L<README.vms>. |
326 | |
327 | OpenBSD better supported. [XXX what others?] |
328 | |
329 | =head1 Modules and Pragmata |
330 | |
331 | =head2 New Modules |
332 | |
333 | =over |
334 | |
335 | =item B |
336 | |
337 | Perl compiler and tools. See [XXX what?]. |
338 | |
339 | =item Data::Dumper |
340 | |
341 | A module to pretty print Perl data. See L<Data::Dumper>. |
342 | |
343 | =item Errno |
344 | |
345 | A module to look up errors more conveniently. See L<Errno>. |
346 | |
347 | =item File::Spec |
348 | |
349 | A portable API for file operations. |
350 | |
351 | =item ExtUtils::Installed |
352 | |
353 | Query and manage installed modules. |
354 | |
355 | =item ExtUtils::Packlist |
356 | |
357 | Manipulate .packlist files. |
358 | |
359 | =item Fatal |
360 | |
361 | Make functions/builtins succeed or die. |
362 | |
363 | =item IPC::SysV |
364 | |
365 | Constants and other support infrastructure for System V IPC operations |
366 | in perl. |
367 | |
368 | =item Test |
369 | |
370 | A framework for writing testsuites. |
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371 | |
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372 | =item Tie::Array |
373 | |
374 | Base class for tied arrays. |
375 | |
376 | =item Tie::Handle |
377 | |
378 | Base class for tied handles. |
379 | |
380 | =item Thread |
381 | |
382 | Perl thread creation, manipulation, and support. |
383 | |
384 | =item attrs |
385 | |
386 | Set subroutine attributes. |
387 | |
388 | =item fields |
389 | |
390 | Compile-time class fields. |
391 | |
392 | =item re |
393 | |
394 | Various pragmata to control behavior of regular expressions. |
395 | |
396 | =back |
397 | |
398 | =head2 Changes in existing modules |
399 | |
400 | =over |
401 | |
402 | =item CGI |
403 | |
404 | CGI has been updated to version 2.42. |
405 | |
406 | =item POSIX |
407 | |
408 | POSIX now has its own platform-specific hints files. |
409 | |
410 | =item DB_File |
411 | |
412 | DB_File supports version 2.x of Berkeley DB. See C<ext/DB_File/Changes>. |
413 | |
414 | =item MakeMaker |
415 | |
416 | MakeMaker now supports writing empty makefiles, provides a way to |
417 | specify that site umask() policy should be honored. There is also |
418 | better support for manipulation of .packlist files, and getting |
419 | information about installed modules. |
420 | |
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421 | Extensions that have both architecture-dependent and |
422 | architecture-independent files are now always installed completely in |
423 | the architecture-dependent locations. Previously, the shareable parts |
424 | were shared both across architectures and across perl versions and were |
425 | therefore liable to be overwritten with newer versions that might have |
426 | subtle incompatibilities. |
427 | |
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428 | =item CPAN |
429 | |
430 | [XXX What?] |
431 | |
432 | =item Cwd |
433 | |
434 | Cwd::cwd is faster on most platforms. |
435 | |
436 | =item Benchmark |
437 | |
438 | Keeps better time. |
439 | |
440 | =back |
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441 | |
442 | =head1 Utility Changes |
443 | |
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444 | h2ph and related utilities have been vastly overhauled. |
445 | |
446 | perlcc, a new experimental front end for the compiler is available. |
447 | |
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448 | The crude GNU configure emulator is now called configure.gnu. |
449 | |
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450 | =head1 API Changes |
451 | |
452 | =head2 Incompatible Changes |
453 | |
454 | =head2 Deprecations, Extensions |
455 | |
456 | =head2 C++ Support |
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457 | |
458 | =head1 Documentation Changes |
459 | |
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460 | Config.pm now has a glossary of variables. |
461 | |
462 | Porting/patching.pod has detailed instructions on how to create and |
463 | submit patches for perl. |
464 | |
465 | =head1 New Diagnostics |
466 | |
467 | =over |
468 | |
469 | =item Ambiguous call resolved as CORE::%s(), qualify as such or use & |
470 | |
471 | (W) A subroutine you have declared has the same name as a Perl keyword, |
472 | and you have used the name without qualification for calling one or the |
473 | other. Perl decided to call the builtin because the subroutine is |
474 | not imported. |
475 | |
476 | To force interpretation as a subroutine call, either put an ampersand |
477 | before the subroutine name, or qualify the name with its package. |
478 | Alternatively, you can import the subroutine (or pretend that it's |
479 | imported with the C<use subs> pragma). |
480 | |
481 | To silently interpret it as the Perl operator, use the C<CORE::> prefix |
482 | on the operator (e.g. C<CORE::log($x)>) or by declaring the subroutine |
483 | to be an object method (see L<attrs>). |
484 | |
485 | =item Bad index while coercing array into hash |
486 | |
487 | (F) The index looked up in the hash found as the 0'th element of a |
488 | pseudo-hash is not legal. Index values must be at 1 or greater. |
489 | See L<perlref>. |
490 | |
491 | =item Bareword "%s" refers to nonexistent package |
492 | |
493 | (W) You used a qualified bareword of the form C<Foo::>, but |
494 | the compiler saw no other uses of that namespace before that point. |
495 | Perhaps you need to predeclare a package? |
496 | |
497 | =item Can't call method "%s" on an undefined value |
498 | |
499 | (F) You used the syntax of a method call, but the slot filled by the |
500 | object reference or package name contains an undefined value. |
501 | Something like this will reproduce the error: |
502 | |
503 | $BADREF = 42; |
504 | process $BADREF 1,2,3; |
505 | $BADREF->process(1,2,3); |
506 | |
507 | =item Can't coerce array into hash |
508 | |
509 | (F) You used an array where a hash was expected, but the array has no |
510 | information on how to map from keys to array indices. You can do that |
511 | only with arrays that have a hash reference at index 0. |
512 | |
513 | =item Can't goto subroutine from an eval-string |
514 | |
515 | (F) The "goto subroutine" call can't be used to jump out of an eval "string". |
516 | (You can use it to jump out of an eval {BLOCK}, but you probably don't want to.) |
517 | |
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518 | =item Can't localize pseudo-hash element |
519 | |
520 | (F) You said something like C<local $ar-E<gt>{'key'}>, where $ar is |
521 | a reference to a pseudo-hash. That hasn't been implemented yet, but |
522 | you can get a similar effect by localizing the corresponding array |
523 | element directly -- C<local $ar-E<gt>[$ar-E<gt>[0]{'key'}]>. |
524 | |
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525 | =item Can't use %%! because Errno.pm is not available |
526 | |
527 | (F) The first time the %! hash is used, perl automatically loads the |
528 | Errno.pm module. The Errno module is expected to tie the %! hash to |
529 | provide symbolic names for C<$!> errno values. |
530 | |
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531 | =item Cannot find an opnumber for "%s" |
532 | |
533 | (F) A string of a form C<CORE::word> was given to prototype(), but |
534 | there is no builtin with the name C<word>. |
535 | |
536 | =item Character class syntax [. .] is reserved for future extensions |
537 | |
538 | (W) Within regular expression character classes ([]) the syntax beginning |
539 | with "[." and ending with ".]" is reserved for future extensions. |
540 | If you need to represent those character sequences inside a regular |
541 | expression character class, just quote the square brackets with the |
542 | backslash: "\[." and ".\]". |
543 | |
544 | =item Character class syntax [: :] is reserved for future extensions |
545 | |
546 | (W) Within regular expression character classes ([]) the syntax beginning |
547 | with "[:" and ending with ":]" is reserved for future extensions. |
548 | If you need to represent those character sequences inside a regular |
549 | expression character class, just quote the square brackets with the |
550 | backslash: "\[:" and ":\]". |
551 | |
552 | =item Character class syntax [= =] is reserved for future extensions |
553 | |
554 | (W) Within regular expression character classes ([]) the syntax |
555 | beginning with "[=" and ending with "=]" is reserved for future extensions. |
556 | If you need to represent those character sequences inside a regular |
557 | expression character class, just quote the square brackets with the |
558 | backslash: "\[=" and "=\]". |
559 | |
560 | =item %s: Eval-group in insecure regular expression |
561 | |
562 | (F) Perl detected tainted data when trying to compile a regular expression |
563 | that contains the C<(?{ ... })> zero-width assertion, which is unsafe. |
564 | See L<perlre/(?{ code })>, and L<perlsec>. |
565 | |
566 | =item %s: Eval-group not allowed, use re 'eval' |
567 | |
568 | (F) A regular expression contained the C<(?{ ... })> zero-width assertion, |
569 | but that construct is only allowed when the C<use re 'eval'> pragma is |
570 | in effect. See L<perlre/(?{ code })>. |
571 | |
572 | =item %s: Eval-group not allowed at run time |
573 | |
574 | (F) Perl tried to compile a regular expression containing the C<(?{ ... })> |
575 | zero-width assertion at run time, as it would when the pattern contains |
576 | interpolated values. Since that is a security risk, it is not allowed. |
577 | If you insist, you may still do this by explicitly building the pattern |
578 | from an interpolated string at run time and using that in an eval(). |
579 | See L<perlre/(?{ code })>. |
580 | |
581 | =item Explicit blessing to '' (assuming package main) |
582 | |
583 | (W) You are blessing a reference to a zero length string. This has |
584 | the effect of blessing the reference into the package main. This is |
585 | usually not what you want. Consider providing a default target |
586 | package, e.g. bless($ref, $p or 'MyPackage'); |
587 | |
588 | =item Illegal hex digit ignored |
589 | |
590 | (W) You may have tried to use a character other than 0 - 9 or A - F in a |
591 | hexadecimal number. Interpretation of the hexadecimal number stopped |
592 | before the illegal character. |
593 | |
594 | =item No such array field |
595 | |
596 | (F) You tried to access an array as a hash, but the field name used is |
597 | not defined. The hash at index 0 should map all valid field names to |
598 | array indices for that to work. |
599 | |
600 | =item No such field "%s" in variable %s of type %s |
601 | |
602 | (F) You tried to access a field of a typed variable where the type |
603 | does not know about the field name. The field names are looked up in |
604 | the %FIELDS hash in the type package at compile time. The %FIELDS hash |
605 | is usually set up with the 'fields' pragma. |
606 | |
607 | =item Out of memory during ridiculously large request |
608 | |
609 | (F) You can't allocate more than 2^31+"small amount" bytes. This error |
610 | is most likely to be caused by a typo in the Perl program. e.g., C<$arr[time]> |
611 | instead of C<$arr[$time]>. |
612 | |
613 | =item Range iterator outside integer range |
614 | |
615 | (F) One (or both) of the numeric arguments to the range operator ".." |
616 | are outside the range which can be represented by integers internally. |
617 | One possible workaround is to force Perl to use magical string |
618 | increment by prepending "0" to your numbers. |
619 | |
620 | =item Recursive inheritance detected while looking for method '%s' in package '%s' |
621 | |
622 | (F) More than 100 levels of inheritance were encountered while invoking a |
623 | method. Probably indicates an unintended loop in your inheritance hierarchy. |
624 | |
625 | =item Reference found where even-sized list expected |
626 | |
627 | (W) You gave a single reference where Perl was expecting a list with |
628 | an even number of elements (for assignment to a hash). This |
629 | usually means that you used the anon hash constructor when you meant |
630 | to use parens. In any case, a hash requires key/value B<pairs>. |
631 | |
632 | %hash = { one => 1, two => 2, }; # WRONG |
633 | %hash = [ qw/ an anon array / ]; # WRONG |
634 | %hash = ( one => 1, two => 2, ); # right |
635 | %hash = qw( one 1 two 2 ); # also fine |
636 | |
637 | =item Undefined value assigned to typeglob |
638 | |
639 | (W) An undefined value was assigned to a typeglob, a la C<*foo = undef>. |
640 | This does nothing. It's possible that you really mean C<undef *foo>. |
641 | |
642 | =item Use of reserved word "%s" is deprecated |
643 | |
644 | (D) The indicated bareword is a reserved word. Future versions of perl |
645 | may use it as a keyword, so you're better off either explicitly quoting |
646 | the word in a manner appropriate for its context of use, or using a |
647 | different name altogether. The warning can be suppressed for subroutine |
648 | names by either adding a C<&> prefix, or using a package qualifier, |
649 | e.g. C<&our()>, or C<Foo::our()>. |
650 | |
651 | =item perl: warning: Setting locale failed. |
652 | |
653 | (S) The whole warning message will look something like: |
654 | |
655 | perl: warning: Setting locale failed. |
656 | perl: warning: Please check that your locale settings: |
657 | LC_ALL = "En_US", |
658 | LANG = (unset) |
659 | are supported and installed on your system. |
660 | perl: warning: Falling back to the standard locale ("C"). |
661 | |
662 | Exactly what were the failed locale settings varies. In the above the |
663 | settings were that the LC_ALL was "En_US" and the LANG had no value. |
664 | This error means that Perl detected that you and/or your system |
665 | administrator have set up the so-called variable system but Perl could |
666 | not use those settings. This was not dead serious, fortunately: there |
667 | is a "default locale" called "C" that Perl can and will use, the |
668 | script will be run. Before you really fix the problem, however, you |
669 | will get the same error message each time you run Perl. How to really |
670 | fix the problem can be found in L<perllocale> section B<LOCALE PROBLEMS>. |
671 | |
672 | =back |
673 | |
674 | |
675 | =head1 Obsolete Diagnostics |
676 | |
677 | =over |
6cc33c6d |
678 | |
429b3afa |
679 | =item Can't mktemp() |
680 | |
681 | (F) The mktemp() routine failed for some reason while trying to process |
682 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. |
683 | |
684 | =item Can't write to temp file for B<-e>: %s |
685 | |
686 | (F) The write routine failed for some reason while trying to process |
687 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. |
688 | |
689 | =item Cannot open temporary file |
690 | |
691 | (F) The create routine failed for some reason while trying to process |
692 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. |
693 | |
694 | |
695 | =back |
696 | |
01784f0d |
697 | =head1 BUGS |
698 | |
699 | If you find what you think is a bug, you might check the headers of |
700 | recently posted articles in the comp.lang.perl.misc newsgroup. |
701 | There may also be information at http://www.perl.com/perl/, the Perl |
702 | Home Page. |
703 | |
704 | If you believe you have an unreported bug, please run the B<perlbug> |
705 | program included with your release. Make sure you trim your bug down |
706 | to a tiny but sufficient test case. Your bug report, along with the |
707 | output of C<perl -V>, will be sent off to <F<perlbug@perl.com>> to be |
708 | analysed by the Perl porting team. |
709 | |
710 | =head1 SEE ALSO |
711 | |
712 | The F<Changes> file for exhaustive details on what changed. |
713 | |
714 | The F<INSTALL> file for how to build Perl. |
715 | |
716 | The F<README> file for general stuff. |
717 | |
718 | The F<Artistic> and F<Copying> files for copyright information. |
719 | |
720 | =head1 HISTORY |
429b3afa |
721 | |
722 | =cut |