1PERL5161DELTA(1)       Perl Programmers Reference Guide       PERL5161DELTA(1)
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NAME

6       perl5161delta - what is new for perl v5.16.1
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DESCRIPTION

9       This document describes differences between the 5.16.0 release and the
10       5.16.1 release.
11
12       If you are upgrading from an earlier release such as 5.14.0, first read
13       perl5160delta, which describes differences between 5.14.0 and 5.16.0.
14

Security

16   an off-by-two error in Scalar-List-Util has been fixed
17       The bugfix was in Scalar-List-Util 1.23_04, and perl 5.16.1 includes
18       Scalar-List-Util 1.25.
19

Incompatible Changes

21       There are no changes intentionally incompatible with 5.16.0 If any
22       exist, they are bugs, and we request that you submit a report.  See
23       "Reporting Bugs" below.
24

Modules and Pragmata

26   Updated Modules and Pragmata
27       •   Scalar::Util and List::Util have been upgraded from version 1.23 to
28           version 1.25.
29
30       •   B::Deparse has been updated from version 1.14 to 1.14_01.  An
31           "uninitialized" warning emitted by B::Deparse has been squashed
32           [perl #113464].
33

Configuration and Compilation

35       •   Building perl with some Windows compilers used to fail due to a
36           problem with miniperl's "glob" operator (which uses the "perlglob"
37           program) deleting the PATH environment variable [perl #113798].
38

Platform Support

40   Platform-Specific Notes
41       VMS All C header files from the top-level directory of the distribution
42           are now installed on VMS, providing consistency with a long-
43           standing practice on other platforms. Previously only a subset were
44           installed, which broke non-core extension builds for extensions
45           that depended on the missing include files.
46

Selected Bug Fixes

48       •   A regression introduced in Perl v5.16.0 involving
49           "tr/SEARCHLIST/REPLACEMENTLIST/" has been fixed.  Only the first
50           instance is supposed to be meaningful if a character appears more
51           than once in "SEARCHLIST".  Under some circumstances, the final
52           instance was overriding all earlier ones.  [perl #113584]
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54       •   "B::COP::stashlen" has been added.   This provides access to an
55           internal field added in perl 5.16 under threaded builds.  It was
56           broken at the last minute before 5.16 was released [perl #113034].
57
58       •   The re pragma will no longer clobber $_. [perl #113750]
59
60       •   Unicode 6.1 published an incorrect alias for one of the
61           Canonical_Combining_Class property's values (which range between 0
62           and 254).  The alias "CCC133" should have been "CCC132".  Perl now
63           overrides the data file furnished by Unicode to give the correct
64           value.
65
66       •   Duplicating scalar filehandles works again.  [perl #113764]
67
68       •   Under threaded perls, a runtime code block in a regular expression
69           could corrupt the package name stored in the op tree, resulting in
70           bad reads in "caller", and possibly crashes [perl #113060].
71
72       •   For efficiency's sake, many operators and built-in functions return
73           the same scalar each time.  Lvalue subroutines and subroutines in
74           the CORE:: namespace were allowing this implementation detail to
75           leak through.  "print &CORE::uc("a"), &CORE::uc("b")" used to print
76           "BB".  The same thing would happen with an lvalue subroutine
77           returning the return value of "uc".  Now the value is copied in
78           such cases [perl #113044].
79
80       •   "__SUB__" now works in special blocks ("BEGIN", "END", etc.).
81
82       •   Formats that reference lexical variables from outside no longer
83           result in crashes.
84

Known Problems

86       There are no new known problems, but consult "Known Problems" in
87       perl5160delta to see those identified in the 5.16.0 release.
88

Acknowledgements

90       Perl 5.16.1 represents approximately 2 months of development since Perl
91       5.16.0 and contains approximately 14,000 lines of changes across 96
92       files from 8 authors.
93
94       Perl continues to flourish into its third decade thanks to a vibrant
95       community of users and developers. The following people are known to
96       have contributed the improvements that became Perl 5.16.1:
97
98       Chris 'BinGOs' Williams, Craig A. Berry, Father Chrysostomos, Karl
99       Williamson, Paul Johnson, Reini Urban, Ricardo Signes, Tony Cook.
100
101       The list above is almost certainly incomplete as it is automatically
102       generated from version control history. In particular, it does not
103       include the names of the (very much appreciated) contributors who
104       reported issues to the Perl bug tracker.
105
106       Many of the changes included in this version originated in the CPAN
107       modules included in Perl's core. We're grateful to the entire CPAN
108       community for helping Perl to flourish.
109
110       For a more complete list of all of Perl's historical contributors,
111       please see the AUTHORS file in the Perl source distribution.
112

Reporting Bugs

114       If you find what you think is a bug, you might check the articles
115       recently posted to the comp.lang.perl.misc newsgroup and the perl bug
116       database at http://rt.perl.org/perlbug/ .  There may also be
117       information at http://www.perl.org/ , the Perl Home Page.
118
119       If you believe you have an unreported bug, please run the perlbug
120       program included with your release.  Be sure to trim your bug down to a
121       tiny but sufficient test case.  Your bug report, along with the output
122       of "perl -V", will be sent off to perlbug@perl.org to be analysed by
123       the Perl porting team.
124
125       If the bug you are reporting has security implications, which make it
126       inappropriate to send to a publicly archived mailing list, then please
127       send it to perl5-security-report@perl.org. This points to a closed
128       subscription unarchived mailing list, which includes all the core
129       committers, who will be able to help assess the impact of issues,
130       figure out a resolution, and help co-ordinate the release of patches to
131       mitigate or fix the problem across all platforms on which Perl is
132       supported. Please only use this address for security issues in the Perl
133       core, not for modules independently distributed on CPAN.
134

SEE ALSO

136       The Changes file for an explanation of how to view exhaustive details
137       on what changed.
138
139       The INSTALL file for how to build Perl.
140
141       The README file for general stuff.
142
143       The Artistic and Copying files for copyright information.
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147perl v5.38.2                      2023-11-30                  PERL5161DELTA(1)
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