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Perl

Perl updated to 5.16

Perl 5.16 introduces a number of significant changes:

New Features

• Unicode 6.1
• More consistent eval controlled with unicode_eval and evalbytes feature
• 2- and 3-argument substr called in left-value context is evaluted even after changing original string
• New T_*REF_REFCOUNT_FIXED XS typemap fixing reference counter decremetion
• New is_utf8_char_buf XS-callable function replaces broken is_utf8_char function
• $$ variable is writable
• Improved debugger: tracing mode can be restricted to certain level, breakpoints can be disabled temporarily, breakpoints can be set by file name
• sort subroutines can be autoloaded
• $[ variable is provided by arybase module
• mmaped PerlIO layer is now a separate module PerlIO::mmap

Deprecated Features

• Accessing Unicode database files directly is deprecated now; use Unicode::UCD instead
• Version::Requirements is deprecated in favor of CPAN::Meta::Requirements

Incompatible Changes

• Special blocks (e.g. BEGIN) are called in void context
• Unoverloaded stringification of regular expression does not return the expression literal
• T_DATAUNIT and T_CALLBACK XS typemaps removed
• User defined case-changing has been removed in favor of Unicode::Casing
• XSUB C functions are static now and they are not exported from their object files
• Read-only references cannot be weaken
• $$, $<, $>, $(, and $) do not cache their value
• Devel::DProf, Shell have been removed from Perl core
• perl4 libraries removed: abbrev.pl, assert.pl, bigfloat.pl, bigint.pl, bigrat.pl, cacheout.pl, complete.pl, ctime.pl, dotsh.pl, exceptions.pl, fastcwd.pl, flush.pl, getcwd.pl, getopt.pl, getopts.pl, hostname.pl, importenv.pl, lib/find{,depth}.pl, look.pl, newgetopt.pl, open2.pl, open3.pl, pwd.pl, hellwords.pl, stat.pl, tainted.pl, termcap.pl, timelocal.pl

Python updated to 3.3

The system Python 3 stack has been upgraded to 3.3 (the system Python 2 stack remains at 2.7), bringing in hundreds of fixes and tweaks; for a list of changes see http://docs.python.org/dev/whatsnew/3.3.html

Clojure joined by leiningen and tools

Fedora 18 now ships a more complete Clojure programming stack, including the build tool Leiningen. This will make it easier to package other Clojure libraries in the future.