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Abigail > perl-5.15.9 > perldelta


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Source   Latest Release: perl-5.28.0-RC1


perldelta - what is new for perl v5.15.9


This document describes differences between the 5.15.8 release and the 5.15.9 release.

If you are upgrading from an earlier release such as 5.15.7, first read perl5158delta, which describes differences between 5.15.7 and 5.15.8.

Notice ^

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Core Enhancements ^

no feature; now means reset to default

no feature now resets to the default feature set. To disable all features (which is likely to be a pretty special-purpose request, since it presumably won't match any named set of semantics) you can now write no feature ':all'.

Security ^

Malformed UTF-8 input could cause attempts to read beyond the end of the buffer

Two new XS-accessible functions, utf8_to_uvchr_buf() and utf8_to_uvuni_buf() are now available to prevent this, and the Perl core has been converted to use them. See "Internal Changes".

Incompatible Changes ^

no feature;

no feature; now means reset to default.

Deprecations ^

Literal "{" characters in regular expressions.

It has been documented that the current plans include requiring a literal "{" to be escaped: 5.18 will emit deprecation warnings, and it will be required in 5.20.

XS functions utf8_to_uvchr() and utf8_to_uvuni()

Use utf8_to_uvchr_buf() and utf8_to_uvuni_buf() instead. See "Internal Changes".

Performance Enhancements ^

Modules and Pragmata ^

Updated Modules and Pragmata

Documentation ^

There has been no significant change in the documentation between 5.15.8 and 5.15.9.

Diagnostics ^

The following additions or changes have been made to diagnostic output, including warnings and fatal error messages. For the complete list of diagnostic messages, see perldiag.

New Diagnostics

New Errors

Compared to 5.15.8, 5.15.9 does not introduce new errors.

New Warnings

Compared to 5.15.8, 5.15.9 does not introduce new warnings, but see "Changes to Existing Diagnostics"

Changes to Existing Diagnostics

Utility Changes ^

No utilities changed between 5.15.8 and 5.15.9.

Configuration and Compilation ^

Testing ^

Platform Support ^

There have been no changes to Perl's support of various platforms between 5.15.8 and 5.15.9.

Internal Changes ^

Selected Bug Fixes ^

Known Problems ^

This is a list of some significant unfixed bugs, which need to be resolved before 5.16.0

op/sigdispatch.t fails alarm test 14 and gets killed [perl #89718]

Perl crash due to wrong delimiter in PATH environment [perl #94846]

It's possible to crash perl under Win32 if the wrong delimiter is used.

Corrupt UTF8 [perl #79960, #100058]

It is possible to read an invalid UTF8 character, but have it marked valid, or to incorrectly read UTF8 characters if $/ is set to read fixed length records.

UTF8 patches for 5.16 [perl #107008]

Brian Fraser's work on UTF8 needs further integration.

eval { 'fork()' } is broken on Windows [perl #109718]

This is a known test failure to be fixed before 5.16.0.

Warnings from cpan/IO-Compress [perl #110736]

Some tests in cpan/IO-Compress/t/cz-03zlib-v1.t issues a "isn't numeric" warning in blead, but not in maint.

Pod-Html test failures on Windows.

A number of tests for Pod::Html fail under Windows, due to an incorrect assumption by the test scripts about capitalization of the network drive.

Acknowledgements ^

Perl 5.15.9 represents approximately 4 weeks of development since Perl 5.15.8 and contains approximately 79,000 lines of changes across 530 files from 23 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 5.15.9:

Aaron Crane, Abigail, Chris 'BinGOs' Williams, Craig A. Berry, Dave Rolsky, David Cantrell, David Golden, David Mitchell, Eric Brine, Father Chrysostomos, Florian Ragwitz, James E Keenan, Jesse Vincent, Karl Williamson, Marc Green, Max Maischein, Nicholas Clark, Pau Amma, Reini Urban, Ricardo Signes, Tony Cook, Yves Orton, Zefram.

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 . There may also be information at , 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 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 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.


The Changes file for an explanation of how to view exhaustive details on what changed.

The INSTALL file for how to build Perl.

The README file for general stuff.

The Artistic and Copying files for copyright information.

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