1PERL5320DELTA(1) Perl Programmers Reference Guide PERL5320DELTA(1)
2
6 perl5320delta - what is new for perl v5.32.0
7
9 This document describes differences between the 5.30.0 release and the
10 5.32.0 release.
11 If you are upgrading from an earlier release such as 5.28.0, first read
13 perl5300delta, which describes differences between 5.28.0 and 5.30.0.
14
16 The isa Operator
17 A new experimental infix operator called "isa" tests whether a given
18 object is an instance of a given class or a class derived from it:
19 if( $obj isa Package::Name ) { ... }
21 For more detail see "Class Instance Operator" in perlop.
23 Unicode 13.0 is supported
25 See <https://www.unicode.org/versions/Unicode13.0.0/> for details.
26 Chained comparisons capability
28 Some comparison operators, as their associativity, chain with some
29 operators of the same precedence (but never with operators of different
30 precedence).
31 if ( $x < $y <= $z ) {...}
33 behaves exactly like:
35 if ( $x < $y && $y <= $z ) {...}
37 (assuming that "$y" is as simple a scalar as it looks.)
39 You can read more about this in perlop under "Operator Precedence and
41 Associativity" in perlop.
42 New Unicode properties "Identifier_Status" and "Identifier_Type" supported
44 Unicode has revised its regular expression requirements:
45 <https://www.unicode.org/reports/tr18/tr18-21.html>. As part of that
46 they are wanting more properties to be exposed, ones that aren't part
47 of the strict UCD (Unicode character database). These two are used for
48 examining inputs for security purposes. Details on their usage is at
49 <https://www.unicode.org/reports/tr39/>.
50 It is now possible to write "qr/\p{Name=...}/", or
52 "qr!\p{na=/(SMILING|GRINNING) FACE/}!"
53 The Unicode Name property is now accessible in regular expression
54 patterns, as an alternative to "\N{...}". A comparison of the two
55 methods is given in "Comparison of \N{...} and \p{name=...}" in
56 perlunicode.
57 The second example above shows that wildcard subpatterns are also
59 usable in this property. See "Wildcards in Property Values" in
60 perlunicode.
61 Improvement of "POSIX::mblen()", "mbtowc", and "wctomb"
63 The "POSIX::mblen()", "mbtowc", and "wctomb" functions now work on
64 shift state locales and are thread-safe on C99 and above compilers when
65 executed on a platform that has locale thread-safety; the length
66 parameters are now optional.
67 These functions are always executed under the current C language
69 locale. (See perllocale.) Most locales are stateless, but a few,
70 notably the very rarely encountered ISO 2022, maintain a state between
71 calls to these functions. Previously the state was cleared on every
72 call, but now the state is not reset unless the appropriate parameter
73 is "undef".
74 On threaded perls, the C99 functions mbrlen(3), mbrtowc(3), and
76 wcrtomb(3), when available, are substituted for the plain functions.
77 This makes these functions thread-safe when executing on a locale
78 thread-safe platform.
79 The string length parameters in "mblen" and "mbtowc" are now optional;
81 useful only if you wish to restrict the length parsed in the source
82 string to less than the actual length.
83 Alpha assertions are no longer experimental
85 See "(*pla:pattern)" in perlre, "(*plb:pattern)" in perlre,
86 "(*nla:pattern)" in perlre>, and "(*nlb:pattern)" in perlre. Use of
87 these no longer generates a warning; existing code that disables the
88 warning category "experimental::alpha_assertions" will continue to work
89 without any changes needed. Enabling the category has no effect.
90 Script runs are no longer experimental
92 See "Script Runs" in perlre. Use of these no longer generates a
93 warning; existing code that disables the warning category
94 "experimental::script_run" will continue to work without any changes
95 needed. Enabling the category has no effect.
96 Feature checks are now faster
98 Previously feature checks in the parser required a hash lookup when
99 features were set outside of a feature bundle, this has been optimized
100 to a bit mask check. [GH #17229
101 <https://github.com/Perl/perl5/issues/17229>]
102 Perl is now developed on GitHub
104 Perl is now developed on GitHub. You can find us at
105 <https://github.com/Perl/perl5>.
106 Non-security bugs should now be reported via GitHub. Security issues
108 should continue to be reported as documented in perlsec.
109 Compiled patterns can now be dumped before optimization
111 This is primarily useful for tracking down bugs in the regular
112 expression compiler. This dump happens on "-DDEBUGGING" perls, if you
113 specify "-Drv" on the command line; or on any perl if the pattern is
114 compiled within the scope of "use re qw(Debug DUMP_PRE_OPTIMIZE)" or
115 "use re qw(Debug COMPILE EXTRA)". (All but the second case display
116 other information as well.)
117
119 [CVE-2020-10543] Buffer overflow caused by a crafted regular expression
120 A signed "size_t" integer overflow in the storage space calculations
121 for nested regular expression quantifiers could cause a heap buffer
122 overflow in Perl's regular expression compiler that overwrites memory
123 allocated after the regular expression storage space with attacker
124 supplied data.
125 The target system needs a sufficient amount of memory to allocate
127 partial expansions of the nested quantifiers prior to the overflow
128 occurring. This requirement is unlikely to be met on 64-bit systems.
129 Discovered by: ManhND of The Tarantula Team, VinCSS (a member of
131 Vingroup).
132 [CVE-2020-10878] Integer overflow via malformed bytecode produced by a
134 crafted regular expression
135 Integer overflows in the calculation of offsets between instructions
136 for the regular expression engine could cause corruption of the
137 intermediate language state of a compiled regular expression. An
138 attacker could abuse this behaviour to insert instructions into the
139 compiled form of a Perl regular expression.
140 Discovered by: Hugo van der Sanden and Slaven Rezic.
142 [CVE-2020-12723] Buffer overflow caused by a crafted regular expression
144 Recursive calls to "S_study_chunk()" by Perl's regular expression
145 compiler to optimize the intermediate language representation of a
146 regular expression could cause corruption of the intermediate language
147 state of a compiled regular expression.
148 Discovered by: Sergey Aleynikov.
150 Additional Note
152 An application written in Perl would only be vulnerable to any of the
153 above flaws if it evaluates regular expressions supplied by the
154 attacker. Evaluating regular expressions in this fashion is known to
155 be dangerous since the regular expression engine does not protect
156 against denial of service attacks in this usage scenario.
157
159 Certain pattern matching features are now prohibited in compiling Unicode
160 property value wildcard subpatterns
161 These few features are either inappropriate or interfere with the
162 algorithm used to accomplish this task. The complete list is in
163 "Wildcards in Property Values" in perlunicode.
164 Unused functions "POSIX::mbstowcs" and "POSIX::wcstombs" are removed
166 These functions could never have worked due to a defective interface
167 specification. There is clearly no demand for them, given that no one
168 has ever complained in the many years the functions were claimed to be
169 available, hence so-called "support" for them is now dropped.
170 A bug fix for "(?[...])" may have caused some patterns to no longer compile
172 See "Selected Bug Fixes". The heuristics previously used may have let
173 some constructs compile (perhaps not with the programmer's intended
174 effect) that should have been errors. None are known, but it is
175 possible that some erroneous constructs no longer compile.
176 "\p{user-defined}" properties now always override official Unicode ones
178 Previously, if and only if a user-defined property was declared prior
179 to the compilation of the regular expression pattern that contains it,
180 its definition was used instead of any official Unicode property with
181 the same name. Now, it always overrides the official property. This
182 change could break existing code that relied (likely unwittingly) on
183 the previous behavior. Without this fix, if Unicode released a new
184 version with a new property that happens to have the same name as the
185 one you had long been using, your program would break when you upgraded
186 to a perl that used that new Unicode version. See "User-Defined
187 Character Properties" in perlunicode. [GH #17205
188 <https://github.com/Perl/perl5/issues/17205>]
189 Modifiable variables are no longer permitted in constants
191 Code like:
192 my $var;
194 $sub = sub () { $var };
195 where $var is referenced elsewhere in some sort of modifiable context
197 now produces an exception when the sub is defined.
198 This error can be avoided by adding a return to the sub definition:
200 $sub = sub () { return $var };
202 This has been deprecated since Perl 5.22. [GH #17020]
204 <https://github.com/Perl/perl5/issues/17020>
205 Use of "vec" on strings with code points above 0xFF is forbidden
207 Such strings are represented internally in UTF-8, and "vec" is a bit-
208 oriented operation that will likely give unexpected results on those
209 strings. This was deprecated in perl 5.28.0.
210 Use of code points over 0xFF in string bitwise operators
212 Some uses of these were already illegal after a previous deprecation
213 cycle. The remaining uses are now prohibited, having been deprecated in
214 perl 5.28.0. See perldeprecation.
215 "Sys::Hostname::hostname()" does not accept arguments
217 This usage was deprecated in perl 5.28.0 and is now fatal.
218 Plain "0" string now treated as a number for range operator
220 Previously a range "0" .. "-1" would produce a range of numeric strings
221 from "0" through "99"; this now produces an empty list, just as "0 ..
222 -1" does. This also means that "0" .. "9" now produces a list of
223 integers, where previously it would produce a list of strings.
224 This was due to a special case that treated strings starting with "0"
226 as strings so ranges like "00" .. "03" produced "00", "01", "02", "03",
227 but didn't specially handle the string "0". [GH #16770]
228 <https://github.com/Perl/perl5/issues/16770>
229 "\K" now disallowed in look-ahead and look-behind assertions
231 This was disallowed because it causes unexpected behaviour, and no-one
232 could define what the desired behaviour should be. [GH #14638]
233 <https://github.com/Perl/perl5/issues/14638>
234
236 • "my_strnlen" has been sped up for systems that don't have their own
237 "strnlen" implementation.
238 • "grok_bin_oct_hex" (and so, "grok_bin", "grok_oct", and "grok_hex")
240 have been sped up.
241 • "grok_number_flags" has been sped up.
243 • "sort" is now noticeably faster in cases such as "sort {$a <=> $b}"
245 or "sort {$b <=> $a}". [GH #17608
246 <https://github.com/Perl/perl5/pull/17608>]
247
249 Updated Modules and Pragmata
250 • Archive::Tar has been upgraded from version 2.32 to 2.36.
251 • autodie has been upgraded from version 2.29 to 2.32.
253 • B has been upgraded from version 1.76 to 1.80.
255 • B::Deparse has been upgraded from version 1.49 to 1.54.
257 • Benchmark has been upgraded from version 1.22 to 1.23.
259 • charnames has been upgraded from version 1.45 to 1.48.
261 • Class::Struct has been upgraded from version 0.65 to 0.66.
263 • Compress::Raw::Bzip2 has been upgraded from version 2.084 to 2.093.
265 • Compress::Raw::Zlib has been upgraded from version 2.084 to 2.093.
267 • CPAN has been upgraded from version 2.22 to 2.27.
269 • DB_File has been upgraded from version 1.843 to 1.853.
271 • Devel::PPPort has been upgraded from version 3.52 to 3.57.
273 The test files generated on Win32 are now identical to when they
275 are generated on POSIX-like systems.
276 • diagnostics has been upgraded from version 1.36 to 1.37.
278 • Digest::MD5 has been upgraded from version 2.55 to 2.55_01.
280 • Dumpvalue has been upgraded from version 1.18 to 1.21.
282 Previously, when dumping elements of an array and encountering an
284 undefined value, the string printed would have been "empty array".
285 This has been changed to what was apparently originally intended:
286 "empty slot".
287 • DynaLoader has been upgraded from version 1.45 to 1.47.
289 • Encode has been upgraded from version 3.01 to 3.06.
291 • encoding has been upgraded from version 2.22 to 3.00.
293 • English has been upgraded from version 1.10 to 1.11.
295 • Exporter has been upgraded from version 5.73 to 5.74.
297 • ExtUtils::CBuilder has been upgraded from version 0.280231 to
299 0.280234.
300 • ExtUtils::MakeMaker has been upgraded from version 7.34 to 7.44.
302 • feature has been upgraded from version 1.54 to 1.58.
304 A new "indirect" feature has been added, which is enabled by
306 default but allows turning off indirect object syntax.
307 • File::Find has been upgraded from version 1.36 to 1.37.
309 On Win32, the tests no longer require either a file in the drive
311 root directory, or a writable root directory.
312 • File::Glob has been upgraded from version 1.32 to 1.33.
314 • File::stat has been upgraded from version 1.08 to 1.09.
316 • Filter::Simple has been upgraded from version 0.95 to 0.96.
318 • Getopt::Long has been upgraded from version 2.5 to 2.51.
320 • Hash::Util has been upgraded from version 0.22 to 0.23.
322 The Synopsis has been updated as the example code stopped working
324 with newer perls. [GH #17399
325 <https://github.com/Perl/perl5/issues/17399>]
326 • I18N::Langinfo has been upgraded from version 0.18 to 0.19.
328 • I18N::LangTags has been upgraded from version 0.43 to 0.44.
330 Document the "IGNORE_WIN32_LOCALE" environment variable.
332 • IO has been upgraded from version 1.40 to 1.43.
334 IO::Socket no longer caches a zero protocol value, since this
336 indicates that the implementation will select a protocol. This
337 means that on platforms that don't implement "SO_PROTOCOL" for a
338 given socket type the protocol method may return "undef".
339 The supplied TO is now always honoured on calls to the "send()"
341 method. [GH #16891] <https://github.com/Perl/perl5/issues/16891>
342 • IO-Compress has been upgraded from version 2.084 to 2.093.
344 • IPC::Cmd has been upgraded from version 1.02 to 1.04.
346 • IPC::Open3 has been upgraded from version 1.20 to 1.21.
348 • JSON::PP has been upgraded from version 4.02 to 4.04.
350 • Math::BigInt has been upgraded from version 1.999816 to 1.999818.
352 • Math::BigInt::FastCalc has been upgraded from version 0.5008 to
354 0.5009.
355 • Module::CoreList has been upgraded from version 5.20190522 to
357 5.20200620.
358 • Module::Load::Conditional has been upgraded from version 0.68 to
360 0.70.
361 • Module::Metadata has been upgraded from version 1.000036 to
363 1.000037.
364 • mro has been upgraded from version 1.22 to 1.23.
366 • Net::Ping has been upgraded from version 2.71 to 2.72.
368 • Opcode has been upgraded from version 1.43 to 1.47.
370 • open has been upgraded from version 1.11 to 1.12.
372 • overload has been upgraded from version 1.30 to 1.31.
374 • parent has been upgraded from version 0.237 to 0.238.
376 • perlfaq has been upgraded from version 5.20190126 to 5.20200523.
378 • PerlIO has been upgraded from version 1.10 to 1.11.
380 • PerlIO::encoding has been upgraded from version 0.27 to 0.28.
382 • PerlIO::via has been upgraded from version 0.17 to 0.18.
384 • Pod::Html has been upgraded from version 1.24 to 1.25.
386 • Pod::Simple has been upgraded from version 3.35 to 3.40.
388 • podlators has been upgraded from version 4.11 to 4.14.
390 • POSIX has been upgraded from version 1.88 to 1.94.
392 • re has been upgraded from version 0.37 to 0.40.
394 • Safe has been upgraded from version 2.40 to 2.41.
396 • Scalar::Util has been upgraded from version 1.50 to 1.55.
398 • SelfLoader has been upgraded from version 1.25 to 1.26.
400 • Socket has been upgraded from version 2.027 to 2.029.
402 • Storable has been upgraded from version 3.15 to 3.21.
404 Use of "note()" from Test::More is now optional in tests. This
406 works around a circular dependency with Test::More when installing
407 on very old perls from CPAN.
408 Vstring magic strings over 2GB are now disallowed.
410 Regular expressions objects weren't properly counted for object id
412 purposes on retrieve. This would corrupt the resulting structure,
413 or cause a runtime error in some cases. [GH #17037]
414 <https://github.com/Perl/perl5/issues/17037>
415 • Sys::Hostname has been upgraded from version 1.22 to 1.23.
417 • Sys::Syslog has been upgraded from version 0.35 to 0.36.
419 • Term::ANSIColor has been upgraded from version 4.06 to 5.01.
421 • Test::Simple has been upgraded from version 1.302162 to 1.302175.
423 • Thread has been upgraded from version 3.04 to 3.05.
425 • Thread::Queue has been upgraded from version 3.13 to 3.14.
427 • threads has been upgraded from version 2.22 to 2.25.
429 • threads::shared has been upgraded from version 1.60 to 1.61.
431 • Tie::File has been upgraded from version 1.02 to 1.06.
433 • Tie::Hash::NamedCapture has been upgraded from version 0.10 to
435 0.13.
436 • Tie::Scalar has been upgraded from version 1.04 to 1.05.
438 • Tie::StdHandle has been upgraded from version 4.5 to 4.6.
440 • Time::HiRes has been upgraded from version 1.9760 to 1.9764.
442 Removed obsolete code such as support for pre-5.6 perl and classic
444 MacOS. [GH #17096] <https://github.com/Perl/perl5/issues/17096>
445 • Time::Piece has been upgraded from version 1.33 to 1.3401.
447 • Unicode::Normalize has been upgraded from version 1.26 to 1.27.
449 • Unicode::UCD has been upgraded from version 0.72 to 0.75.
451 • VMS::Stdio has been upgraded from version 2.44 to 2.45.
453 • warnings has been upgraded from version 1.44 to 1.47.
455 • Win32 has been upgraded from version 0.52 to 0.53.
457 • Win32API::File has been upgraded from version 0.1203 to 0.1203_01.
459 • XS::APItest has been upgraded from version 1.00 to 1.09.
461 Removed Modules and Pragmata
463 • Pod::Parser has been removed from the core distribution. It still
464 is available for download from CPAN. This resolves [#13194
465 <https://github.com/Perl/perl5/issues/13194>].
466
468 Changes to Existing Documentation
469 We have attempted to update the documentation to reflect the changes
470 listed in this document. If you find any we have missed, open an issue
471 at <https://github.com/Perl/perl5/issues>.
472 Additionally, the following selected changes have been made:
474 perldebguts
476 • Simplify a few regnode definitions
478 Update "BOUND" and "NBOUND" definitions.
480 • Add ANYOFHs regnode
482 This node is like "ANYOFHb", but is used when more than one leading
484 byte is the same in all the matched code points.
485 "ANYOFHb" is used to avoid having to convert from UTF-8 to code
487 point for something that won't match. It checks that the first byte
488 in the UTF-8 encoded target is the desired one, thus ruling out
489 most of the possible code points.
490 perlapi
492 • "sv_2pvbyte" updated to mention it will croak if the SV cannot be
494 downgraded.
495 • "sv_setpvn" updated to mention that the UTF-8 flag will not be
497 changed by this function, and a terminating NUL byte is guaranteed.
498 • Documentation for "PL_phase" has been added.
500 • The documentation for "grok_bin", "grok_oct", and "grok_hex" has
502 been updated and clarified.
503 perldiag
505 • Add documentation for experimental 'isa' operator
507 (S experimental::isa) This warning is emitted if you use the
509 ("isa") operator. This operator is currently experimental and its
510 behaviour may change in future releases of Perl.
511 perlfunc
513 "caller"
515 Like "__FILE__" and "__LINE__", the filename and line number
516 returned here may be altered by the mechanism described at "Plain
517 Old Comments (Not!)" in perlsyn.
518 "__FILE__"
520 It can be altered by the mechanism described at "Plain Old Comments
521 (Not!)" in perlsyn.
522 "__LINE__"
524 It can be altered by the mechanism described at "Plain Old Comments
525 (Not!)" in perlsyn.
526 "return"
528 Now mentions that you cannot return from "do BLOCK".
529 "open"
531 The "open()" section had been renovated significantly.
532 perlguts
534 • No longer suggesting using perl's "malloc". Modern system "malloc"
536 is assumed to be much better than perl's implementation now.
537 • Documentation about embed.fnc flags has been removed. embed.fnc now
539 has sufficient comments within it. Anyone changing that file will
540 see those comments first, so entries here are now redundant.
541 • Updated documentation for "UTF8f"
543 • Added missing "=for apidoc" lines
545 perlhacktips
547 • The differences between Perl strings and C strings are now
549 detailed.
550 perlintro
552 • The documentation for the repetition operator "x" have been
554 clarified. [GH #17335
555 <https://github.com/Perl/perl5/issues/17335>]
556 perlipc
558 • The documentation surrounding "open" and handle usage has been
560 modernized to prefer 3-arg open and lexical variables instead of
561 barewords.
562 • Various updates and fixes including making all examples strict-safe
564 and replacing "-w" with "use warnings".
565 perlop
567 • 'isa' operator is experimental
569 This is an experimental feature and is available when enabled by
571 "use feature 'isa'". It emits a warning in the "experimental::isa"
572 category.
573 perlpod
575 • Details of the various stacks within the perl interpreter are now
577 explained here.
578 • Advice has been added regarding the usage of "Z<>".
580 perlport
582 • Update "timegm" example to use the correct year format 1970 instead
584 of 70. [GH #16431 <https://github.com/Perl/perl5/issues/16431>]
585 perlreref
587 • Fix some typos.
589 perlvar
591 • Now recommends stringifying $] and comparing it numerically.
593 perlapi, perlintern
595 • Documentation has been added for several functions that were
597 lacking it before.
598 perlxs
600 • Suggest using "libffi" for simple library bindings via CPAN modules
602 like FFI::Platypus or FFI::Raw.
603 POSIX
605 • "setlocale" warning about threaded builds updated to note it does
607 not apply on Perl 5.28.X and later.
608 • "Posix::SigSet->new(...)" updated to state it throws an error if
610 any of the supplied signals cannot be added to the set.
611 Additionally, the following selected changes have been made:
613 Updating of links
615 • Links to the now defunct <https://search.cpan.org> site now point
617 at the equivalent <https://metacpan.org> URL. [GH #17393
618 <https://github.com/Perl/perl5/issues/17393>]
619 • The man page for ExtUtils::XSSymSet is now only installed on VMS,
621 which is the only platform the module is installed on. [GH #17424
622 <https://github.com/Perl/perl5/issues/17424>]
623 • URLs have been changed to "https://" and stale links have been
625 updated.
626 Where applicable, the URLs in the documentation have been moved
628 from using the "http://" protocol to "https://". This also affects
629 the location of the bug tracker at <https://rt.perl.org>.
630 • Some links to OS/2 libraries, Address Sanitizer and other system
632 tools had gone stale. These have been updated with working links.
633 • Some links to old email addresses on perl5-porters had gone stale.
635 These have been updated with working links.
636
638 The following additions or changes have been made to diagnostic output,
639 including warnings and fatal error messages. For the complete list of
640 diagnostic messages, see perldiag.
641 New Diagnostics
643 New Errors
644 • Expecting interpolated extended charclass in regex; marked by <--
646 HERE in m/%s/
647 This is a replacement for several error messages listed under
649 "Changes to Existing Diagnostics".
650 • "No digits found for %s literal"
652 (F) No hexadecimal digits were found following "0x" or no binary
654 digits were found following "0b".
655 New Warnings
657 • Code point 0x%X is not Unicode, and not portable
659 This is actually not a new message, but it is now output when the
661 warnings category "portable" is enabled.
662 When raised during regular expression pattern compilation, the
664 warning has extra text added at the end marking where precisely in
665 the pattern it occurred.
666 • Non-hex character '%c' terminates \x early. Resolved as "%s"
668 This replaces a warning that was much less specific, and which gave
670 false information. This new warning parallels the similar already-
671 existing one raised for "\o{}".
672 Changes to Existing Diagnostics
674 • Character following "\c" must be printable ASCII
675 ...now has extra text added at the end, when raised during regular
677 expression pattern compilation, marking where precisely in the
678 pattern it occurred.
679 • Use "%s" instead of "%s"
681 ...now has extra text added at the end, when raised during regular
683 expression pattern compilation, marking where precisely in the
684 pattern it occurred.
685 • Sequence "\c{" invalid
687 ...now has extra text added at the end, when raised during regular
689 expression pattern compilation, marking where precisely in the
690 pattern it occurred.
691 • "\c%c" is more clearly written simply as "%s"
693 ...now has extra text added at the end, when raised during regular
695 expression pattern compilation, marking where precisely in the
696 pattern it occurred.
697 • Non-octal character '%c' terminates \o early. Resolved as "%s"
699 ...now includes the phrase "terminates \o early", and has extra
701 text added at the end, when raised during regular expression
702 pattern compilation, marking where precisely in the pattern it
703 occurred. In some instances the text of the resolution has been
704 clarified.
705 • '%s' resolved to '\o{%s}%d'
707 As of Perl 5.32, this message is no longer generated. Instead,
709 "Non-octal character '%c' terminates \o early. Resolved as "%s""
710 in perldiag is used instead.
711 • Use of code point 0x%s is not allowed; the permissible max is 0x%X
713 Some instances of this message previously output the hex digits
715 "A", "B", "C", "D", "E", and "F" in lower case. Now they are all
716 consistently upper case.
717 • The following three diagnostics have been removed, and replaced by
719 "Expecting interpolated extended charclass in regex; marked by <--
720 HERE in m/%s/" : "Expecting close paren for nested extended
721 charclass in regex; marked by <-- HERE in m/%s/", "Expecting close
722 paren for wrapper for nested extended charclass in regex; marked by
723 <-- HERE in m/%s/", and "Expecting '(?flags:(?[...' in regex;
724 marked by <-- HERE in m/%s/".
725 • The "Code point 0x%X is not Unicode, and not portable" warning
727 removed the line "Code points above 0xFFFF_FFFF require larger than
728 a 32 bit word." as code points that large are no longer legal on
729 32-bit platforms.
730 • Can't use global %s in %s
732 This error message has been slightly reformatted from the original
734 "Can't use global %s in "%s"", and in particular misleading error
735 messages like "Can't use global $_ in "my"" are now rendered as
736 "Can't use global $_ in subroutine signature".
737 • Constants from lexical variables potentially modified elsewhere are
739 no longer permitted
740 This error message replaces the former "Constants from lexical
742 variables potentially modified elsewhere are deprecated. This will
743 not be allowed in Perl 5.32" to reflect the fact that this
744 previously deprecated usage has now been transformed into an
745 exception. The message's classification has also been updated from
746 D (deprecated) to F (fatal).
747 See also "Incompatible Changes".
749 • "\N{} here is restricted to one character" is now emitted in the
751 same circumstances where previously "\N{} in inverted character
752 class or as a range end-point is restricted to one character" was.
753 This is due to new circumstances having been added in Perl 5.30
755 that weren't covered by the earlier wording.
756
758 perlbug
759 • The bug tracker homepage URL now points to GitHub.
760 streamzip
762 • This is a new utility, included as part of an IO::Compress::Base
763 upgrade.
764 streamzip creates a zip file from stdin. The program will read data
766 from stdin, compress it into a zip container and, by default, write
767 a streamed zip file to stdout.
768
770 Configure
771 • For clang++, add "#include <stdlib.h>" to Configure's probes for
772 "futimes", "strtoll", "strtoul", "strtoull", "strtouq", otherwise
773 the probes would fail to compile.
774 • Use a compile and run test for "lchown" to satisfy clang++ which
776 should more reliably detect it.
777 • For C++ compilers, add "#include <stdio.h>" to Configure's probes
779 for "getpgrp" and "setpgrp" as they use printf and C++ compilers
780 may fail compilation instead of just warning.
781 • Check if the compiler can handle inline attribute.
783 • Check for character data alignment.
785 • Configure now correctly handles gcc-10. Previously it was
787 interpreting it as gcc-1 and turned on "-fpcc-struct-return".
788 • Perl now no longer probes for "d_u32align", defaulting to "define"
790 on all platforms. This check was error-prone when it was done,
791 which was on 32-bit platforms only. [GH #16680]
792 <https://github.com/Perl/perl5/issues/16680>
793 • Documentation and hints for building perl on Z/OS (native EBCDIC)
795 have been updated. This is still a work in progress.
796 • A new probe for "malloc_usable_size" has been added.
798 • Improvements in Configure to detection in C++ and clang++. Work
800 ongoing by Andy Dougherty. [GH #17033]
801 <https://github.com/Perl/perl5/issues/17033>
802 • autodoc.pl
804 This tool that regenerates perlintern and perlapi has been
806 overhauled significantly, restoring consistency in flags used in
807 embed.fnc and Devel::PPPort and allowing removal of many redundant
808 "=for apidoc" entries in code.
809 • The "ECHO" macro is now defined. This is used in a "dtrace" rule
811 that was originally changed for FreeBSD, and the FreeBSD make
812 apparently predefines it. The Solaris make does not predefine
813 "ECHO" which broke this rule on Solaris. [GH #17057]
814 <https://github.com/Perl/perl5/issues/17057>
815 • Bison versions 3.1 through 3.4 are now supported.
817
819 Tests were added and changed to reflect the other additions and changes
820 in this release. Furthermore, these significant changes were made:
821 • t/run/switches.t no longer uses (and re-uses) the tmpinplace/
823 directory under t/. This may prevent spurious failures. [GH #17424
824 <https://github.com/Perl/perl5/issues/17424>]
825 • Various bugs in "POSIX::mbtowc" were fixed. Potential races with
827 other threads are now avoided, and previously the returned wide
828 character could well be garbage.
829 • Various bugs in "POSIX::wctomb" were fixed. Potential races with
831 other threads are now avoided, and previously it would segfault if
832 the string parameter was shared or hadn't been pre-allocated with a
833 string of sufficient length to hold the result.
834 • Certain test output of scalars containing control characters and
836 Unicode has been fixed on EBCDIC.
837 • t/charset_tools.pl: Avoid some work on ASCII platforms.
839 • t/re/regexp.t: Speed up many regex tests on ASCII platform
841 • t/re/pat.t: Skip tests that don't work on EBCDIC.
843
845 Discontinued Platforms
846 Windows CE
847 Support for building perl on Windows CE has now been removed.
848 Platform-Specific Notes
850 Linux
851 "cc" will be used to populate "plibpth" if "cc" is "clang". [GH
852 #17043] <https://github.com/Perl/perl5/issues/17043>
853 NetBSD 8.0
855 Fix compilation of Perl on NetBSD 8.0 with g++. [GH #17381
856 <https://github.com/Perl/perl5/issues/17381>]
857 Windows
859 • The configuration for "ccflags" and "optimize" are now
860 separate, as with POSIX platforms. [GH #17156
861 <https://github.com/Perl/perl5/issues/17156>]
862 • Support for building perl with Visual C++ 6.0 has now been
864 removed.
865 • The locale tests could crash on Win32 due to a Windows bug, and
867 separately due to the CRT throwing an exception if the locale
868 name wasn't validly encoded in the current code page.
869 For the second we now decode the locale name ourselves, and
871 always decode it as UTF-8. [GH #16922]
872 <https://github.com/Perl/perl5/issues/16922>
873 • t/op/magic.t could fail if environment variables starting with
875 "FOO" already existed.
876 • MYMALLOC (PERL_MALLOC) build has been fixed.
878 Solaris
880 • "Configure" will now find recent versions of the Oracle
881 Developer Studio compiler, which are found under
882 "/opt/developerstudio*".
883 • "Configure" now uses the detected types for "gethostby*"
885 functions, allowing Perl to once again compile on certain
886 configurations of Solaris.
887 VMS
889 • With the release of the patch kit C99 V2.0, VSI has provided
890 support for a number of previously-missing C99 features. On
891 systems with that patch kit installed, Perl's configuration
892 process will now detect the presence of the header "stdint.h"
893 and the following functions: "fpclassify", "isblank", "isless",
894 "llrint", "llrintl", "llround", "llroundl", "nearbyint",
895 "round", "scalbn", and "scalbnl".
896 • "-Duse64bitint" is now the default on VMS.
898 z/OS
900 Perl 5.32 has been tested on z/OS 2.4, with the following caveats:
901 • Only static builds (the default) build reliably
903 • When using locales, z/OS does not handle the "LC_MESSAGES"
905 category properly, so when compiling perl, you should add the
906 following to your Configure options
907 ./Configure <other options> -Accflags=-DNO_LOCALE_MESSAGES
909 • z/OS does not support locales with threads, so when compiling a
911 threaded perl, you should add the following to your Configure
912 options
913 ./Configure <other Configure options> -Accflags=-DNO_LOCALE
915 • Some CPAN modules that are shipped with perl fail at least one
917 of their self-tests. These are: Archive::Tar, Config::Perl::V,
918 CPAN::Meta, CPAN::Meta::YAML, Digest::MD5, Digest::SHA, Encode,
919 ExtUtils::MakeMaker, ExtUtils::Manifest, HTTP::Tiny,
920 IO::Compress, IPC::Cmd, JSON::PP, libnet, MIME::Base64,
921 Module::Metadata, PerlIO::via-QuotedPrint, Pod::Checker,
922 podlators, Pod::Simple, Socket, and Test::Harness.
923 The causes of the failures range from the self-test itself is
925 flawed, and the module actually works fine, up to the module
926 doesn't work at all on EBCDIC platforms.
927
929 • "savepvn"'s len parameter is now a "Size_t" instead of an "I32"
930 since we can handle longer strings than 31 bits.
931 • The lexer ("Perl_yylex()" in toke.c) was previously a single
933 4100-line function, relying heavily on "goto" and a lot of widely-
934 scoped local variables to do its work. It has now been pulled apart
935 into a few dozen smaller static functions; the largest remaining
936 chunk ("yyl_word_or_keyword()") is a little over 900 lines, and
937 consists of a single "switch" statement, all of whose "case" groups
938 are independent. This should be much easier to understand and
939 maintain.
940 • The OS-level signal handlers and type (Sighandler_t) used by the
942 perl core were declared as having three parameters, but the OS was
943 always told to call them with one argument. This has been fixed by
944 declaring them to have one parameter. See the merge commit
945 "v5.31.5-346-g116e19abbf" for full details.
946 • The code that handles "tr///" has been extensively revised, fixing
948 various bugs, especially when the source and/or replacement strings
949 contain characters whose code points are above 255. Some of the
950 bugs were undocumented, one being that under some circumstances
951 (but not all) with "/s", the squeezing was done based on the
952 source, rather than the replacement. A documented bug that got
953 fixed was [GH #14777] <https://github.com/Perl/perl5/issues/14777>.
954 • A new macro for XS writers dealing with UTF-8-encoded Unicode
956 strings has been created ""UTF8_CHK_SKIP"" in perlapi that is safer
957 in the face of malformed UTF-8 input than ""UTF8_SKIP"" in perlapi
958 (but not as safe as ""UTF8_SAFE_SKIP"" in perlapi). It won't read
959 past a NUL character. It has been backported in Devel::PPPort 3.55
960 and later.
961 • Added the "PL_curstackinfo->si_cxsubix" field. This records the
963 stack index of the most recently pushed sub/format/eval context. It
964 is set and restored automatically by "cx_pushsub()", "cx_popsub()"
965 etc., but would need to be manually managed if you do any unusual
966 manipulation of the context stack.
967 • Various macros dealing with character type classification and
969 changing case where the input is encoded in UTF-8 now require an
970 extra parameter to prevent potential reads beyond the end of the
971 buffer. Use of these has generated a deprecation warning since Perl
972 5.26. Details are in "In XS code, use of various macros dealing
973 with UTF-8." in perldeprecation
974 • A new parser function parse_subsignature() allows a keyword plugin
976 to parse a subroutine signature while "use feature 'signatures'" is
977 in effect. This allows custom keywords to implement semantics
978 similar to regular "sub" declarations that include signatures. [GH
979 #16261] <https://github.com/Perl/perl5/issues/16261>
980 • Since on some platforms we need to hold a mutex when temporarily
982 switching locales, new macros ("STORE_LC_NUMERIC_SET_TO_NEEDED_IN",
983 "WITH_LC_NUMERIC_SET_TO_NEEDED" and
984 "WITH_LC_NUMERIC_SET_TO_NEEDED_IN") have been added to make it
985 easier to do this safely and efficiently as part of [GH #17034]
986 <https://github.com/Perl/perl5/issues/17034>.
987 • The memory bookkeeping overhead for allocating an OP structure has
989 been reduced by 8 bytes per OP on 64-bit systems.
990 • eval_pv() no longer stringifies the exception when "[GH
992 #17035]|https://github.com/Perl/perl5/issues/17035"]
993 • The PERL_DESTRUCT_LEVEL environment variable was formerly only
995 honoured on perl binaries built with DEBUGGING support. It is now
996 checked on all perl builds. Its normal use is to force perl to
997 individually free every block of memory which it has allocated
998 before exiting, which is useful when using automated leak detection
999 tools such as valgrind.
1000 • The API eval_sv() now accepts a "G_RETHROW" flag. If this flag is
1002 set and an exception is thrown while compiling or executing the
1003 supplied code, it will be rethrown, and eval_sv() will not return.
1004 [GH #17036] <https://github.com/Perl/perl5/issues/17036>
1005 • As part of the fix for [GH #1537]
1007 <https://github.com/Perl/perl5/issues/1537> perl_parse() now
1008 returns non-zero if exit(0) is called in a "BEGIN", "UNITCHECK" or
1009 "CHECK" block.
1010 • Most functions which recursively walked an op tree during
1012 compilation have been made non-recursive. This avoids SEGVs from
1013 stack overflow when the op tree is deeply nested, such as "$n == 1
1014 ? "one" : $n == 2 ? "two" : ...." (especially in code which is
1015 auto-generated).
1016 This is particularly noticeable where the code is compiled within a
1018 separate thread, as threads tend to have small stacks by default.
1019
1021 • Previously "require" in perlfunc would only treat the special
1022 built-in SV &PL_sv_undef as a value in %INC as if a previous
1023 "require" has failed, treating other undefined SVs as if the
1024 previous "require" has succeeded. This could cause unexpected
1025 success from "require" e.g., on "local %INC = %INC;". This has been
1026 fixed. [GH #17428 <https://github.com/Perl/perl5/issues/17428>]
1027 • "(?{...})" eval groups in regular expressions no longer
1029 unintentionally trigger "EVAL without pos change exceeded limit in
1030 regex" [GH #17490 <https://github.com/Perl/perl5/issues/17490>].
1031 • "(?[...])" extended bracketed character classes do not wrongly
1033 raise an error on some cases where a previously-compiled such class
1034 is interpolated into another. The heuristics previously used have
1035 been replaced by a reliable method, and hence the diagnostics
1036 generated have changed. See "Diagnostics".
1037 • The debug display (say by specifying "-Dr" or "use re" (with
1039 appropriate options) of compiled Unicode property wildcard
1040 subpatterns no longer has extraneous output.
1041 • Fix an assertion failure in the regular expression engine. [GH
1043 #17372 <https://github.com/Perl/perl5/issues/17372>]
1044 • Fix coredump in pp_hot.c after "B::UNOP_AUX::aux_list()". [GH
1046 #17301 <https://github.com/Perl/perl5/issues/17301>]
1047 • Loading IO is now threadsafe. [GH #14816
1049 <https://github.com/Perl/perl5/issues/14816>]
1050 • "\p{user-defined}" overrides official Unicode [GH #17025
1052 <https://github.com/Perl/perl5/issues/17025>]
1053 Prior to this patch, the override was only sometimes in effect.
1055 • Properly handle filled "/il" regnodes and multi-char folds
1057 • Compilation error during make minitest [GH #17293
1059 <https://github.com/Perl/perl5/issues/17293>]
1060 • Move the implementation of "%-", "%+" into core.
1062 • Read beyond buffer in "grok_inf_nan" [GH #17370
1064 <https://github.com/Perl/perl5/issues/17370>]
1065 • Workaround glibc bug with "LC_MESSAGES" [GH #17081
1067 <https://github.com/Perl/perl5/issues/17081>]
1068 • "printf()" or "sprintf()" with the %n format could cause a panic on
1070 debugging builds, or report an incorrectly cached length value when
1071 producing "SVfUTF8" flagged strings. [GH #17221
1072 <https://github.com/Perl/perl5/issues/17221>]
1073 • The tokenizer has been extensively refactored. [GH #17241
1075 <https://github.com/Perl/perl5/issues/17241>] [GH #17189
1076 <https://github.com/Perl/perl5/issues/17189>]
1077 • "use strict "subs"" is now enforced for bareword constants
1079 optimized into a "multiconcat" operator. [GH #17254
1080 <https://github.com/Perl/perl5/issues/17254>]
1081 • A memory leak in regular expression patterns has been fixed. [GH
1083 #17218 <https://github.com/Perl/perl5/issues/17218>]
1084 • Perl no longer treats strings starting with "0x" or "0b" as hex or
1086 binary numbers respectively when converting a string to a number.
1087 This reverts a change in behaviour inadvertently introduced in perl
1088 5.30.0 intended to improve precision when converting a string to a
1089 floating point number. [GH #17062]
1090 <https://github.com/Perl/perl5/issues/17062>
1091 • Matching a non-"SVf_UTF8" string against a regular expression
1093 containing unicode literals could leak a SV on each match attempt.
1094 [GH #17140] <https://github.com/Perl/perl5/issues/17140>
1095 • Overloads for octal and binary floating point literals were always
1097 passed a string with a "0x" prefix instead of the appropriate 0 or
1098 "[GH #14791]|https://github.com/Perl/perl5/issues/14791"]
1099 • "$@ = 100; die;" now correctly propagates the 100 as an exception
1101 instead of ignoring it. [GH #17098]
1102 <https://github.com/Perl/perl5/issues/17098>
1103 • "[GH #17108]|https://github.com/Perl/perl5/issues/17108"]
1105 • Exceptions thrown while $@ is read-only could result in infinite
1107 recursion as perl tried to update $@, which throws another
1108 exception, resulting in a stack overflow. Perl now replaces $@ with
1109 a copy if it's not a simple writable SV. [GH #17083]
1110 <https://github.com/Perl/perl5/issues/17083>
1111 • Setting $) now properly sets supplementary group ids if you have
1113 the necessary privileges. [GH #17031]
1114 <https://github.com/Perl/perl5/issues/17031>
1115 • close() on a pipe now preemptively clears the PerlIO object from
1117 the IO SV. This prevents a second attempt to close the already
1118 closed PerlIO object if a signal handler calls die() or exit()
1119 while close() is waiting for the child process to complete. [GH
1120 #13929] <https://github.com/Perl/perl5/issues/13929>
1121 • "sprintf("%.*a", -10000, $x)" would cause a buffer overflow due to
1123 mishandling of the negative precision value. [GH #16942]
1124 <https://github.com/Perl/perl5/issues/16942>
1125 • scalar() on a reference could cause an erroneous assertion failure
1127 during compilation. [GH #16969]
1128 <https://github.com/Perl/perl5/issues/16969>
1129 • "%{^CAPTURE_ALL}" is now an alias to "%-" as documented, rather
1131 than incorrectly an alias for "[GH
1132 #16105]|https://github.com/Perl/perl5/issues/16105"]
1133 • "%{^CAPTURE}" didn't work if "@{^CAPTURE}" was mentioned first.
1135 Similarly for "%{^CAPTURE_ALL}" and "@{^CAPTURE_ALL}", though "[GH
1136 #17045]|https://github.com/Perl/perl5/issues/17045"]
1137 • Extraordinarily large (over 2GB) floating point format widths could
1139 cause an integer overflow in the underlying call to snprintf(),
1140 resulting in an assertion. Formatted floating point widths are now
1141 limited to the range of int, the return value of snprintf().
1142 [#16881 <https://github.com/Perl/perl5/issues/16881>]
1143 • Parsing the following constructs within a sub-parse (such as with
1145 "${code here}" or "s/.../code here/e") has changed to match how
1146 they're parsed normally:
1147 • "print $fh ..." no longer produces a syntax error.
1149 • Code like "s/.../ ${time} /e" now properly produces an
1151 "Ambiguous use of ${time} resolved to $time at ..." warning
1152 when warnings are enabled.
1153 • "@x {"a"}" (with the space) in a sub-parse now properly
1155 produces a "better written as" warning when warnings are
1156 enabled.
1157 • Attributes can now be used in a sub-parse. [GH #16847]
1159 <https://github.com/Perl/perl5/issues/16847>
1160 • Incomplete hex and binary literals like "0x" and "0b" are now
1162 treated as if the "x" or "b" is part of the next token. [#17010
1163 <https://github.com/Perl/perl5/issues/17010>]
1164 • A spurious ")" in a subparse, such as in "s/.../code here/e" or
1166 "...${code here}", no longer confuses the parser.
1167 Previously a subparse was bracketed with generated "(" and ")"
1169 tokens, so a spurious ")" would close the construct without doing
1170 the normal subparse clean up, confusing the parser and possible
1171 causing an assertion failure.
1172 Such constructs are now surrounded by artificial tokens that can't
1174 be included in the source. [GH #15814]
1175 <https://github.com/Perl/perl5/issues/15814>
1176 • Reference assignment of a sub, such as "\&foo = \&bar;", silently
1178 did nothing in the "[GH
1179 #16987]|https://github.com/Perl/perl5/issues/16987"]
1180 • sv_gets() now recovers better if the target SV is modified by a
1182 signal handler. [GH #16960]
1183 <https://github.com/Perl/perl5/issues/16960>
1184 • "readline @foo" now evaluates @foo in scalar context. Previously it
1186 would be evaluated in list context, and since readline() pops only
1187 one argument from the stack, the stack could underflow, or be left
1188 with unexpected values on the stack. [GH #16929]
1189 <https://github.com/Perl/perl5/issues/16929>
1190 • Parsing incomplete hex or binary literals was changed in 5.31.1 to
1192 treat such a literal as just the 0, leaving the following "x" or
1193 "b" to be parsed as part of the next token. This could lead to some
1194 silent changes in behaviour, so now incomplete hex or binary
1195 literals produce a fatal error. [GH #17010]
1196 <https://github.com/Perl/perl5/issues/17010>
1197 • eval_pv()'s croak_on_error flag will now throw even if the
1199 exception is a false overloaded value. [GH #17036]
1200 <https://github.com/Perl/perl5/issues/17036>
1201 • "INIT" blocks and the program itself are no longer run if exit(0)
1203 is called within a "BEGIN", "UNITCHECK" or "CHECK" block. [GH
1204 #1537] <https://github.com/Perl/perl5/issues/1537>
1205 • "open my $fh, ">>+", undef" now opens the temporary file in append
1207 mode: writes will seek to the end of file before writing. [GH
1208 #17058] <https://github.com/Perl/perl5/issues/17058>
1209 • Fixed a SEGV when searching for the source of an uninitialized
1211 value warning on an op whose subtree includes an OP_MULTIDEREF.
1212 [GH #17088] <https://github.com/Perl/perl5/issues/17088>
1213
1215 Jeff Goff (JGOFF or DrForr), an integral part of the Perl and Raku
1216 communities and a dear friend to all of us, has passed away on March
1217 13th, 2020. DrForr was a prominent member of the communities, attending
1218 and speaking at countless events, contributing to numerous projects,
1219 and assisting and helping in any way he could.
1220 His passing leaves a hole in our hearts and in our communities and he
1222 will be sorely missed.
1223
1225 Perl 5.32.0 represents approximately 13 months of development since
1226 Perl 5.30.0 and contains approximately 220,000 lines of changes across
1227 1,800 files from 89 authors.
1228 Excluding auto-generated files, documentation and release tools, there
1230 were approximately 140,000 lines of changes to 880 .pm, .t, .c and .h
1231 files.
1232 Perl continues to flourish into its fourth decade thanks to a vibrant
1234 community of users and developers. The following people are known to
1235 have contributed the improvements that became Perl 5.32.0:
1236 Aaron Crane, Alberto Simo~es, Alexandr Savca, Andreas Koenig, Andrew
1238 Fresh, Andy Dougherty, Ask Bjorn Hansen, Atsushi Sugawara, Bernhard M.
1239 Wiedemann, brian d foy, Bryan Stenson, Chad Granum, Chase Whitener,
1240 Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsaaker, Dan
1241 Book, Daniel Dragan, Dan Kogai, Dave Cross, Dave Rolsky, David
1242 Cantrell, David Mitchell, Dominic Hargreaves, E. Choroba, Felipe
1243 Gasper, Florian Weimer, Graham Knop, Haakon Haegland, Hauke D, H.Merijn
1244 Brand, Hugo van der Sanden, Ichinose Shogo, James E Keenan, Jason
1245 McIntosh, Jerome Duval, Johan Vromans, John Lightsey, John Paul Adrian
1246 Glaubitz, Kang-min Liu, Karen Etheridge, Karl Williamson, Leon
1247 Timmermans, Manuel Mausz, Marc Green, Matthew Horsfall, Matt Turner,
1248 Max Maischein, Michael Haardt, Nicholas Clark, Nicolas R., Niko Tyni,
1249 Pali, Paul Evans, Paul Johnson, Paul Marquess, Peter Eisentraut, Peter
1250 John Acklam, Peter Oliver, Petr PisaX, Renee Baecker, Ricardo Signes,
1251 Richard Leach, Russ Allbery, Samuel Smith, Santtu Ojanperae, Sawyer X,
1252 Sergey Aleynikov, Sergiy Borodych, Shirakata Kentaro, Shlomi Fish,
1253 Sisyphus, Slaven Rezic, Smylers, Stefan Seifert, Steve Hay, Steve
1254 Peters, Svyatoslav, Thibault Duponchelle, Todd Rinaldo, Tomasz
1255 Konojacki, Tom Hukins, Tony Cook, Unicode Consortium, VanL, Vickenty
1256 Fesunov, Vitali Peil, Yves Orton, Zefram.
1257 The list above is almost certainly incomplete as it is automatically
1259 generated from version control history. In particular, it does not
1260 include the names of the (very much appreciated) contributors who
1261 reported issues to the Perl bug tracker.
1262 Many of the changes included in this version originated in the CPAN
1264 modules included in Perl's core. We're grateful to the entire CPAN
1265 community for helping Perl to flourish.
1266 For a more complete list of all of Perl's historical contributors,
1268 please see the AUTHORS file in the Perl source distribution.
1269
1271 If you find what you think is a bug, you might check the perl bug
1272 database at <https://github.com/Perl/perl5/issues>. There may also be
1273 information at <http://www.perl.org/>, the Perl Home Page.
1274 If you believe you have an unreported bug, please open an issue at
1276 <https://github.com/Perl/perl5/issues>. Be sure to trim your bug down
1277 to a tiny but sufficient test case.
1278 If the bug you are reporting has security implications which make it
1280 inappropriate to send to a public issue tracker, then see "SECURITY
1281 VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to
1282 report the issue.
1283
1285 If you wish to thank the Perl 5 Porters for the work we had done in
1286 Perl 5, you can do so by running the "perlthanks" program:
1287 perlthanks
1289 This will send an email to the Perl 5 Porters list with your show of
1291 thanks.
1292
1294 The Changes file for an explanation of how to view exhaustive details
1295 on what changed.
1296 The INSTALL file for how to build Perl.
1298 The README file for general stuff.
1300 The Artistic and Copying files for copyright information.
1302perl v5.34.1 2022-03-15 PERL5320DELTA(1)