1 | | | | | # -*- buffer-read-only: t -*- |
2 | | | | | # !!!!!!! DO NOT EDIT THIS FILE !!!!!!! |
3 | | | | | # This file is built by regen/feature.pl. |
4 | | | | | # Any changes made here will be lost! |
5 | | | | | |
6 | | | | | package feature; |
7 | | | | | |
8 | 1 | 1µs | | | our $VERSION = '1.40'; |
9 | | | | | |
10 | 1 | 9µs | | | our %feature = ( |
11 | | | | | fc => 'feature_fc', |
12 | | | | | say => 'feature_say', |
13 | | | | | state => 'feature_state', |
14 | | | | | switch => 'feature_switch', |
15 | | | | | bitwise => 'feature_bitwise', |
16 | | | | | evalbytes => 'feature_evalbytes', |
17 | | | | | postderef => 'feature_postderef', |
18 | | | | | array_base => 'feature_arybase', |
19 | | | | | signatures => 'feature_signatures', |
20 | | | | | current_sub => 'feature___SUB__', |
21 | | | | | refaliasing => 'feature_refaliasing', |
22 | | | | | lexical_subs => 'feature_lexsubs', |
23 | | | | | postderef_qq => 'feature_postderef_qq', |
24 | | | | | unicode_eval => 'feature_unieval', |
25 | | | | | unicode_strings => 'feature_unicode', |
26 | | | | | ); |
27 | | | | | |
28 | 1 | 7µs | | | our %feature_bundle = ( |
29 | | | | | "5.10" => [qw(array_base say state switch)], |
30 | | | | | "5.11" => [qw(array_base say state switch unicode_strings)], |
31 | | | | | "5.15" => [qw(current_sub evalbytes fc say state switch unicode_eval unicode_strings)], |
32 | | | | | "all" => [qw(array_base bitwise current_sub evalbytes fc lexical_subs postderef postderef_qq refaliasing say signatures state switch unicode_eval unicode_strings)], |
33 | | | | | "default" => [qw(array_base)], |
34 | | | | | ); |
35 | | | | | |
36 | 1 | 1µs | | | $feature_bundle{"5.12"} = $feature_bundle{"5.11"}; |
37 | 1 | 400ns | | | $feature_bundle{"5.13"} = $feature_bundle{"5.11"}; |
38 | 1 | 800ns | | | $feature_bundle{"5.14"} = $feature_bundle{"5.11"}; |
39 | 1 | 300ns | | | $feature_bundle{"5.16"} = $feature_bundle{"5.15"}; |
40 | 1 | 200ns | | | $feature_bundle{"5.17"} = $feature_bundle{"5.15"}; |
41 | 1 | 200ns | | | $feature_bundle{"5.18"} = $feature_bundle{"5.15"}; |
42 | 1 | 300ns | | | $feature_bundle{"5.19"} = $feature_bundle{"5.15"}; |
43 | 1 | 200ns | | | $feature_bundle{"5.20"} = $feature_bundle{"5.15"}; |
44 | 1 | 300ns | | | $feature_bundle{"5.21"} = $feature_bundle{"5.15"}; |
45 | 1 | 200ns | | | $feature_bundle{"5.22"} = $feature_bundle{"5.15"}; |
46 | 1 | 1µs | | | $feature_bundle{"5.9.5"} = $feature_bundle{"5.10"}; |
47 | | | | | |
48 | 1 | 300ns | | | our $hint_shift = 26; |
49 | 1 | 100ns | | | our $hint_mask = 0x1c000000; |
50 | 1 | 2µs | | | our @hint_bundles = qw( default 5.10 5.11 5.15 ); |
51 | | | | | |
52 | | | | | # This gets set (for now) in $^H as well as in %^H, |
53 | | | | | # for runtime speed of the uc/lc/ucfirst/lcfirst functions. |
54 | | | | | # See HINT_UNI_8_BIT in perl.h. |
55 | 1 | 200ns | | | our $hint_uni8bit = 0x00000800; |
56 | | | | | |
57 | | | | | # TODO: |
58 | | | | | # - think about versioned features (use feature switch => 2) |
59 | | | | | |
60 | | | | | =head1 NAME |
61 | | | | | |
62 | | | | | feature - Perl pragma to enable new features |
63 | | | | | |
64 | | | | | =head1 SYNOPSIS |
65 | | | | | |
66 | | | | | use feature qw(say switch); |
67 | | | | | given ($foo) { |
68 | | | | | when (1) { say "\$foo == 1" } |
69 | | | | | when ([2,3]) { say "\$foo == 2 || \$foo == 3" } |
70 | | | | | when (/^a[bc]d$/) { say "\$foo eq 'abd' || \$foo eq 'acd'" } |
71 | | | | | when ($_ > 100) { say "\$foo > 100" } |
72 | | | | | default { say "None of the above" } |
73 | | | | | } |
74 | | | | | |
75 | | | | | use feature ':5.10'; # loads all features available in perl 5.10 |
76 | | | | | |
77 | | | | | use v5.10; # implicitly loads :5.10 feature bundle |
78 | | | | | |
79 | | | | | =head1 DESCRIPTION |
80 | | | | | |
81 | | | | | It is usually impossible to add new syntax to Perl without breaking |
82 | | | | | some existing programs. This pragma provides a way to minimize that |
83 | | | | | risk. New syntactic constructs, or new semantic meanings to older |
84 | | | | | constructs, can be enabled by C<use feature 'foo'>, and will be parsed |
85 | | | | | only when the appropriate feature pragma is in scope. (Nevertheless, the |
86 | | | | | C<CORE::> prefix provides access to all Perl keywords, regardless of this |
87 | | | | | pragma.) |
88 | | | | | |
89 | | | | | =head2 Lexical effect |
90 | | | | | |
91 | | | | | Like other pragmas (C<use strict>, for example), features have a lexical |
92 | | | | | effect. C<use feature qw(foo)> will only make the feature "foo" available |
93 | | | | | from that point to the end of the enclosing block. |
94 | | | | | |
95 | | | | | { |
96 | | | | | use feature 'say'; |
97 | | | | | say "say is available here"; |
98 | | | | | } |
99 | | | | | print "But not here.\n"; |
100 | | | | | |
101 | | | | | =head2 C<no feature> |
102 | | | | | |
103 | | | | | Features can also be turned off by using C<no feature "foo">. This too |
104 | | | | | has lexical effect. |
105 | | | | | |
106 | | | | | use feature 'say'; |
107 | | | | | say "say is available here"; |
108 | | | | | { |
109 | | | | | no feature 'say'; |
110 | | | | | print "But not here.\n"; |
111 | | | | | } |
112 | | | | | say "Yet it is here."; |
113 | | | | | |
114 | | | | | C<no feature> with no features specified will reset to the default group. To |
115 | | | | | disable I<all> features (an unusual request!) use C<no feature ':all'>. |
116 | | | | | |
117 | | | | | =head1 AVAILABLE FEATURES |
118 | | | | | |
119 | | | | | =head2 The 'say' feature |
120 | | | | | |
121 | | | | | C<use feature 'say'> tells the compiler to enable the Perl 6 style |
122 | | | | | C<say> function. |
123 | | | | | |
124 | | | | | See L<perlfunc/say> for details. |
125 | | | | | |
126 | | | | | This feature is available starting with Perl 5.10. |
127 | | | | | |
128 | | | | | =head2 The 'state' feature |
129 | | | | | |
130 | | | | | C<use feature 'state'> tells the compiler to enable C<state> |
131 | | | | | variables. |
132 | | | | | |
133 | | | | | See L<perlsub/"Persistent Private Variables"> for details. |
134 | | | | | |
135 | | | | | This feature is available starting with Perl 5.10. |
136 | | | | | |
137 | | | | | =head2 The 'switch' feature |
138 | | | | | |
139 | | | | | B<WARNING>: Because the L<smartmatch operator|perlop/"Smartmatch Operator"> is |
140 | | | | | experimental, Perl will warn when you use this feature, unless you have |
141 | | | | | explicitly disabled the warning: |
142 | | | | | |
143 | | | | | no warnings "experimental::smartmatch"; |
144 | | | | | |
145 | | | | | C<use feature 'switch'> tells the compiler to enable the Perl 6 |
146 | | | | | given/when construct. |
147 | | | | | |
148 | | | | | See L<perlsyn/"Switch Statements"> for details. |
149 | | | | | |
150 | | | | | This feature is available starting with Perl 5.10. |
151 | | | | | |
152 | | | | | =head2 The 'unicode_strings' feature |
153 | | | | | |
154 | | | | | C<use feature 'unicode_strings'> tells the compiler to use Unicode rules |
155 | | | | | in all string operations executed within its scope (unless they are also |
156 | | | | | within the scope of either C<use locale> or C<use bytes>). The same applies |
157 | | | | | to all regular expressions compiled within the scope, even if executed outside |
158 | | | | | it. It does not change the internal representation of strings, but only how |
159 | | | | | they are interpreted. |
160 | | | | | |
161 | | | | | C<no feature 'unicode_strings'> tells the compiler to use the traditional |
162 | | | | | Perl rules wherein the native character set rules is used unless it is |
163 | | | | | clear to Perl that Unicode is desired. This can lead to some surprises |
164 | | | | | when the behavior suddenly changes. (See |
165 | | | | | L<perlunicode/The "Unicode Bug"> for details.) For this reason, if you are |
166 | | | | | potentially using Unicode in your program, the |
167 | | | | | C<use feature 'unicode_strings'> subpragma is B<strongly> recommended. |
168 | | | | | |
169 | | | | | This feature is available starting with Perl 5.12; was almost fully |
170 | | | | | implemented in Perl 5.14; and extended in Perl 5.16 to cover C<quotemeta>. |
171 | | | | | |
172 | | | | | =head2 The 'unicode_eval' and 'evalbytes' features |
173 | | | | | |
174 | | | | | Under the C<unicode_eval> feature, Perl's C<eval> function, when passed a |
175 | | | | | string, will evaluate it as a string of characters, ignoring any |
176 | | | | | C<use utf8> declarations. C<use utf8> exists to declare the encoding of |
177 | | | | | the script, which only makes sense for a stream of bytes, not a string of |
178 | | | | | characters. Source filters are forbidden, as they also really only make |
179 | | | | | sense on strings of bytes. Any attempt to activate a source filter will |
180 | | | | | result in an error. |
181 | | | | | |
182 | | | | | The C<evalbytes> feature enables the C<evalbytes> keyword, which evaluates |
183 | | | | | the argument passed to it as a string of bytes. It dies if the string |
184 | | | | | contains any characters outside the 8-bit range. Source filters work |
185 | | | | | within C<evalbytes>: they apply to the contents of the string being |
186 | | | | | evaluated. |
187 | | | | | |
188 | | | | | Together, these two features are intended to replace the historical C<eval> |
189 | | | | | function, which has (at least) two bugs in it, that cannot easily be fixed |
190 | | | | | without breaking existing programs: |
191 | | | | | |
192 | | | | | =over |
193 | | | | | |
194 | | | | | =item * |
195 | | | | | |
196 | | | | | C<eval> behaves differently depending on the internal encoding of the |
197 | | | | | string, sometimes treating its argument as a string of bytes, and sometimes |
198 | | | | | as a string of characters. |
199 | | | | | |
200 | | | | | =item * |
201 | | | | | |
202 | | | | | Source filters activated within C<eval> leak out into whichever I<file> |
203 | | | | | scope is currently being compiled. To give an example with the CPAN module |
204 | | | | | L<Semi::Semicolons>: |
205 | | | | | |
206 | | | | | BEGIN { eval "use Semi::Semicolons; # not filtered here " } |
207 | | | | | # filtered here! |
208 | | | | | |
209 | | | | | C<evalbytes> fixes that to work the way one would expect: |
210 | | | | | |
211 | | | | | use feature "evalbytes"; |
212 | | | | | BEGIN { evalbytes "use Semi::Semicolons; # filtered " } |
213 | | | | | # not filtered |
214 | | | | | |
215 | | | | | =back |
216 | | | | | |
217 | | | | | These two features are available starting with Perl 5.16. |
218 | | | | | |
219 | | | | | =head2 The 'current_sub' feature |
220 | | | | | |
221 | | | | | This provides the C<__SUB__> token that returns a reference to the current |
222 | | | | | subroutine or C<undef> outside of a subroutine. |
223 | | | | | |
224 | | | | | This feature is available starting with Perl 5.16. |
225 | | | | | |
226 | | | | | =head2 The 'array_base' feature |
227 | | | | | |
228 | | | | | This feature supports the legacy C<$[> variable. See L<perlvar/$[> and |
229 | | | | | L<arybase>. It is on by default but disabled under C<use v5.16> (see |
230 | | | | | L</IMPLICIT LOADING>, below). |
231 | | | | | |
232 | | | | | This feature is available under this name starting with Perl 5.16. In |
233 | | | | | previous versions, it was simply on all the time, and this pragma knew |
234 | | | | | nothing about it. |
235 | | | | | |
236 | | | | | =head2 The 'fc' feature |
237 | | | | | |
238 | | | | | C<use feature 'fc'> tells the compiler to enable the C<fc> function, |
239 | | | | | which implements Unicode casefolding. |
240 | | | | | |
241 | | | | | See L<perlfunc/fc> for details. |
242 | | | | | |
243 | | | | | This feature is available from Perl 5.16 onwards. |
244 | | | | | |
245 | | | | | =head2 The 'lexical_subs' feature |
246 | | | | | |
247 | | | | | B<WARNING>: This feature is still experimental and the implementation may |
248 | | | | | change in future versions of Perl. For this reason, Perl will |
249 | | | | | warn when you use the feature, unless you have explicitly disabled the |
250 | | | | | warning: |
251 | | | | | |
252 | | | | | no warnings "experimental::lexical_subs"; |
253 | | | | | |
254 | | | | | This enables declaration of subroutines via C<my sub foo>, C<state sub foo> |
255 | | | | | and C<our sub foo> syntax. See L<perlsub/Lexical Subroutines> for details. |
256 | | | | | |
257 | | | | | This feature is available from Perl 5.18 onwards. |
258 | | | | | |
259 | | | | | =head2 The 'postderef' and 'postderef_qq' features |
260 | | | | | |
261 | | | | | B<WARNING>: This feature is still experimental and the implementation may |
262 | | | | | change in future versions of Perl. For this reason, Perl will |
263 | | | | | warn when you use the feature, unless you have explicitly disabled the |
264 | | | | | warning: |
265 | | | | | |
266 | | | | | no warnings "experimental::postderef"; |
267 | | | | | |
268 | | | | | The 'postderef' feature allows the use of L<postfix dereference |
269 | | | | | syntax|perlref/Postfix Dereference Syntax>. For example, it will make the |
270 | | | | | following two statements equivalent: |
271 | | | | | |
272 | | | | | my @x = @{ $h->{a} }; |
273 | | | | | my @x = $h->{a}->@*; |
274 | | | | | |
275 | | | | | The 'postderef_qq' feature extends this, for array and scalar dereference, to |
276 | | | | | working inside of double-quotish interpolations. |
277 | | | | | |
278 | | | | | This feature is available from Perl 5.20 onwards. |
279 | | | | | |
280 | | | | | =head2 The 'signatures' feature |
281 | | | | | |
282 | | | | | B<WARNING>: This feature is still experimental and the implementation may |
283 | | | | | change in future versions of Perl. For this reason, Perl will |
284 | | | | | warn when you use the feature, unless you have explicitly disabled the |
285 | | | | | warning: |
286 | | | | | |
287 | | | | | no warnings "experimental::signatures"; |
288 | | | | | |
289 | | | | | This enables unpacking of subroutine arguments into lexical variables |
290 | | | | | by syntax such as |
291 | | | | | |
292 | | | | | sub foo ($left, $right) { |
293 | | | | | return $left + $right; |
294 | | | | | } |
295 | | | | | |
296 | | | | | See L<perlsub/Signatures> for details. |
297 | | | | | |
298 | | | | | This feature is available from Perl 5.20 onwards. |
299 | | | | | |
300 | | | | | =head2 The 'refaliasing' feature |
301 | | | | | |
302 | | | | | B<WARNING>: This feature is still experimental and the implementation may |
303 | | | | | change in future versions of Perl. For this reason, Perl will |
304 | | | | | warn when you use the feature, unless you have explicitly disabled the |
305 | | | | | warning: |
306 | | | | | |
307 | | | | | no warnings "experimental::refaliasing"; |
308 | | | | | |
309 | | | | | This enables aliasing via assignment to references: |
310 | | | | | |
311 | | | | | \$a = \$b; # $a and $b now point to the same scalar |
312 | | | | | \@a = \@b; # to the same array |
313 | | | | | \%a = \%b; |
314 | | | | | \&a = \&b; |
315 | | | | | foreach \%hash (@array_of_hash_refs) { |
316 | | | | | ... |
317 | | | | | } |
318 | | | | | |
319 | | | | | See L<perlref/Assigning to References> for details. |
320 | | | | | |
321 | | | | | This feature is available from Perl 5.22 onwards. |
322 | | | | | |
323 | | | | | =head2 The 'bitwise' feature |
324 | | | | | |
325 | | | | | B<WARNING>: This feature is still experimental and the implementation may |
326 | | | | | change in future versions of Perl. For this reason, Perl will |
327 | | | | | warn when you use the feature, unless you have explicitly disabled the |
328 | | | | | warning: |
329 | | | | | |
330 | | | | | no warnings "experimental::bitwise"; |
331 | | | | | |
332 | | | | | This makes the four standard bitwise operators (C<& | ^ ~>) treat their |
333 | | | | | operands consistently as numbers, and introduces four new dotted operators |
334 | | | | | (C<&. |. ^. ~.>) that treat their operands consistently as strings. The |
335 | | | | | same applies to the assignment variants (C<&= |= ^= &.= |.= ^.=>). |
336 | | | | | |
337 | | | | | See L<perlop/Bitwise String Operators> for details. |
338 | | | | | |
339 | | | | | This feature is available from Perl 5.22 onwards. |
340 | | | | | |
341 | | | | | =head1 FEATURE BUNDLES |
342 | | | | | |
343 | | | | | It's possible to load multiple features together, using |
344 | | | | | a I<feature bundle>. The name of a feature bundle is prefixed with |
345 | | | | | a colon, to distinguish it from an actual feature. |
346 | | | | | |
347 | | | | | use feature ":5.10"; |
348 | | | | | |
349 | | | | | The following feature bundles are available: |
350 | | | | | |
351 | | | | | bundle features included |
352 | | | | | --------- ----------------- |
353 | | | | | :default array_base |
354 | | | | | |
355 | | | | | :5.10 say state switch array_base |
356 | | | | | |
357 | | | | | :5.12 say state switch unicode_strings array_base |
358 | | | | | |
359 | | | | | :5.14 say state switch unicode_strings array_base |
360 | | | | | |
361 | | | | | :5.16 say state switch unicode_strings |
362 | | | | | unicode_eval evalbytes current_sub fc |
363 | | | | | |
364 | | | | | :5.18 say state switch unicode_strings |
365 | | | | | unicode_eval evalbytes current_sub fc |
366 | | | | | |
367 | | | | | :5.20 say state switch unicode_strings |
368 | | | | | unicode_eval evalbytes current_sub fc |
369 | | | | | |
370 | | | | | :5.22 say state switch unicode_strings |
371 | | | | | unicode_eval evalbytes current_sub fc |
372 | | | | | |
373 | | | | | The C<:default> bundle represents the feature set that is enabled before |
374 | | | | | any C<use feature> or C<no feature> declaration. |
375 | | | | | |
376 | | | | | Specifying sub-versions such as the C<0> in C<5.14.0> in feature bundles has |
377 | | | | | no effect. Feature bundles are guaranteed to be the same for all sub-versions. |
378 | | | | | |
379 | | | | | use feature ":5.14.0"; # same as ":5.14" |
380 | | | | | use feature ":5.14.1"; # same as ":5.14" |
381 | | | | | |
382 | | | | | =head1 IMPLICIT LOADING |
383 | | | | | |
384 | | | | | Instead of loading feature bundles by name, it is easier to let Perl do |
385 | | | | | implicit loading of a feature bundle for you. |
386 | | | | | |
387 | | | | | There are two ways to load the C<feature> pragma implicitly: |
388 | | | | | |
389 | | | | | =over 4 |
390 | | | | | |
391 | | | | | =item * |
392 | | | | | |
393 | | | | | By using the C<-E> switch on the Perl command-line instead of C<-e>. |
394 | | | | | That will enable the feature bundle for that version of Perl in the |
395 | | | | | main compilation unit (that is, the one-liner that follows C<-E>). |
396 | | | | | |
397 | | | | | =item * |
398 | | | | | |
399 | | | | | By explicitly requiring a minimum Perl version number for your program, with |
400 | | | | | the C<use VERSION> construct. That is, |
401 | | | | | |
402 | | | | | use v5.10.0; |
403 | | | | | |
404 | | | | | will do an implicit |
405 | | | | | |
406 | | | | | no feature ':all'; |
407 | | | | | use feature ':5.10'; |
408 | | | | | |
409 | | | | | and so on. Note how the trailing sub-version |
410 | | | | | is automatically stripped from the |
411 | | | | | version. |
412 | | | | | |
413 | | | | | But to avoid portability warnings (see L<perlfunc/use>), you may prefer: |
414 | | | | | |
415 | | | | | use 5.010; |
416 | | | | | |
417 | | | | | with the same effect. |
418 | | | | | |
419 | | | | | If the required version is older than Perl 5.10, the ":default" feature |
420 | | | | | bundle is automatically loaded instead. |
421 | | | | | |
422 | | | | | =back |
423 | | | | | |
424 | | | | | =cut |
425 | | | | | |
426 | | | | | sub import { |
427 | | | | | my $class = shift; |
428 | | | | | |
429 | | | | | if (!@_) { |
430 | | | | | croak("No features specified"); |
431 | | | | | } |
432 | | | | | |
433 | | | | | __common(1, @_); |
434 | | | | | } |
435 | | | | | |
436 | | | | | sub unimport { |
437 | | | | | my $class = shift; |
438 | | | | | |
439 | | | | | # A bare C<no feature> should reset to the default bundle |
440 | | | | | if (!@_) { |
441 | | | | | $^H &= ~($hint_uni8bit|$hint_mask); |
442 | | | | | return; |
443 | | | | | } |
444 | | | | | |
445 | | | | | __common(0, @_); |
446 | | | | | } |
447 | | | | | |
448 | | | | | |
449 | | | | | sub __common { |
450 | | | | | my $import = shift; |
451 | | | | | my $bundle_number = $^H & $hint_mask; |
452 | | | | | my $features = $bundle_number != $hint_mask |
453 | | | | | && $feature_bundle{$hint_bundles[$bundle_number >> $hint_shift]}; |
454 | | | | | if ($features) { |
455 | | | | | # Features are enabled implicitly via bundle hints. |
456 | | | | | # Delete any keys that may be left over from last time. |
457 | | | | | delete @^H{ values(%feature) }; |
458 | | | | | $^H |= $hint_mask; |
459 | | | | | for (@$features) { |
460 | | | | | $^H{$feature{$_}} = 1; |
461 | | | | | $^H |= $hint_uni8bit if $_ eq 'unicode_strings'; |
462 | | | | | } |
463 | | | | | } |
464 | | | | | while (@_) { |
465 | | | | | my $name = shift; |
466 | | | | | if (substr($name, 0, 1) eq ":") { |
467 | | | | | my $v = substr($name, 1); |
468 | | | | | if (!exists $feature_bundle{$v}) { |
469 | | | | | $v =~ s/^([0-9]+)\.([0-9]+).[0-9]+$/$1.$2/; |
470 | | | | | if (!exists $feature_bundle{$v}) { |
471 | | | | | unknown_feature_bundle(substr($name, 1)); |
472 | | | | | } |
473 | | | | | } |
474 | | | | | unshift @_, @{$feature_bundle{$v}}; |
475 | | | | | next; |
476 | | | | | } |
477 | | | | | if (!exists $feature{$name}) { |
478 | | | | | unknown_feature($name); |
479 | | | | | } |
480 | | | | | if ($import) { |
481 | | | | | $^H{$feature{$name}} = 1; |
482 | | | | | $^H |= $hint_uni8bit if $name eq 'unicode_strings'; |
483 | | | | | } else { |
484 | | | | | delete $^H{$feature{$name}}; |
485 | | | | | $^H &= ~ $hint_uni8bit if $name eq 'unicode_strings'; |
486 | | | | | } |
487 | | | | | } |
488 | | | | | } |
489 | | | | | |
490 | | | | | sub unknown_feature { |
491 | | | | | my $feature = shift; |
492 | | | | | croak(sprintf('Feature "%s" is not supported by Perl %vd', |
493 | | | | | $feature, $^V)); |
494 | | | | | } |
495 | | | | | |
496 | | | | | sub unknown_feature_bundle { |
497 | | | | | my $feature = shift; |
498 | | | | | croak(sprintf('Feature bundle "%s" is not supported by Perl %vd', |
499 | | | | | $feature, $^V)); |
500 | | | | | } |
501 | | | | | |
502 | | | | | sub croak { |
503 | | | | | require Carp; |
504 | | | | | Carp::croak(@_); |
505 | | | | | } |
506 | | | | | |
507 | 1 | 19µs | | | 1; |
508 | | | | | |
509 | | | | | # ex: set ro: |