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perl5161delta - what is new for perl v5.16.1

DESCRIPTION

This document describes differences between the 5.16.0 release and the 5.16.1 release.

If you are upgrading from an earlier release such as 5.14.0, first read perl5160delta,
which describes differences between 5.14.0 and 5.16.0.

Security

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

Incompatible Changes

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

Modules and Pragmata

Updated Modules and Pragmata
· Scalar::Util and List::Util have been upgraded from version 1.23 to version 1.25.

· B::Deparse has been updated from version 1.14 to 1.14_01. An "uninitialized" warning
emitted by B::Deparse has been squashed [perl #113464].

Configuration and Compilation

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

Platform Support

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

Selected Bug Fixes

· A regression introduced in Perl v5.16.0 involving "tr/SEARCHLIST/REPLACEMENTLIST/" has
been fixed. Only the first instance is supposed to be meaningful if a character
appears more than once in "SEARCHLIST". Under some circumstances, the final instance
was overriding all earlier ones. [perl #113584]

· "B::COP::stashlen" has been added. This provides access to an internal field added
in perl 5.16 under threaded builds. It was broken at the last minute before 5.16 was
released [perl #113034].

· The re pragma will no longer clobber $_. [perl #113750]

· Unicode 6.1 published an incorrect alias for one of the Canonical_Combining_Class
property's values (which range between 0 and 254). The alias "CCC133" should have
been "CCC132". Perl now overrides the data file furnished by Unicode to give the
correct value.

· Duplicating scalar filehandles works again. [perl #113764]

· Under threaded perls, a runtime code block in a regular expression could corrupt the
package name stored in the op tree, resulting in bad reads in "caller", and possibly
crashes [perl #113060].

· For efficiency's sake, many operators and built-in functions return the same scalar
each time. Lvalue subroutines and subroutines in the CORE:: namespace were allowing
this implementation detail to leak through. "print &CORE::uc("a"), &CORE::uc("b")"
used to print "BB". The same thing would happen with an lvalue subroutine returning
the return value of "uc". Now the value is copied in such cases [perl #113044].

· "__SUB__" now works in special blocks ("BEGIN", "END", etc.).

· Formats that reference lexical variables from outside no longer result in crashes.

Known Problems

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

Acknowledgements

Perl 5.16.1 represents approximately 2 months of development since Perl 5.16.0 and
contains approximately 14,000 lines of changes across 96 files from 8 authors.

Perl continues to flourish into its third decade thanks to a vibrant community of users
and developers. The following people are known to have contributed the improvements that
became Perl 5.16.1:

Chris 'BinGOs' Williams, Craig A. Berry, Father Chrysostomos, Karl Williamson, Paul
Johnson, Reini Urban, Ricardo Signes, Tony Cook.

The list above is almost certainly incomplete as it is automatically generated from
version control history. In particular, it does not include the names of the (very much
appreciated) contributors who reported issues to the Perl bug tracker.

Many of the changes included in this version originated in the CPAN modules included in
Perl's core. We're grateful to the entire CPAN community for helping Perl to flourish.

For a more complete list of all of Perl's historical contributors, please see the AUTHORS
file in the Perl source distribution.

Reporting Bugs

If you find what you think is a bug, you might check the articles recently posted to the
comp.lang.perl.misc newsgroup and the perl bug database at http://rt.perl.org/perlbug/ .
There may also be information at http://www.perl.org/ , the Perl Home Page.

If you believe you have an unreported bug, please run the perlbug program included with
your release. Be sure to trim your bug down to a tiny but sufficient test case. Your bug
report, along with the output of "perl -V", will be sent off to perlbug@perl.org to be
analysed by the Perl porting team.

If the bug you are reporting has security implications, which make it inappropriate to
send to a publicly archived mailing list, then please send it to
perl5-security-report@perl.org. This points to a closed subscription unarchived mailing
list, which includes all the core committers, who will be able to help assess the impact
of issues, figure out a resolution, and help co-ordinate the release of patches to
mitigate or fix the problem across all platforms on which Perl is supported. Please only
use this address for security issues in the Perl core, not for modules independently
distributed on CPAN.

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