== Perl 5.20 == Perl has been updated to version 5.20 in Fedora 22. This new release brings several new features, changes to existing behavior, and removes a few features; notable changes are described below. New features: * Subroutine 'prototype' attribute allows to declare subroutine prototype in postfix manner. * The new '%hash{...}' and '%array[...]' syntax returns a list of key/value and index/value pairs, respectively. * Unicode 6.3 tables added. * More internal counters support 64-bit values (arrays with more than 2^32 elements, regular expression matching strings longer than 2^32 characters). * Copy-on-write mechanism is used when assigning scalars. * Speed was improved (lazy evaluation of logical conjunction and disjunction in void context, constant hash look-ups, return at the end of subroutine). * New modules were added into the core ('experimental', 'IO::Socket::IP'). Changes in existing behavior: * 'use locale' in an UTF-8 locale environment enables Unicode character type processing. * perl initializes locale according to all locale environment variables (such as 'LANG'). * The '-F' perl option implies the '-a' option. * The '-a' perl option implies '-n' option. * Character after a '\c' sequence in double-quoted string or regular expression must be a printable character and may not be a '{'. * In 'use locale' scope, regular expression matching which depends on locale properties (like case) taints values. * The regular expression pattern element '\p{All}' previously matched only the Unicode code points. Now it matches all possible code points; that is, making it equivalent to qr/./s. Therefore, '\p{All}' is no longer synonymous with '\p{Any}', which continues to match only the Unicode code points. * The output format for 'Data::Dumper' has changed. * Locale decimal point in Perl code is subject to locale only in scope of use locale. Removed features: * 'do subroutine(LIST)' is no longer supported and results in a syntax error. * The 'PerlIO_vsprintf()' and 'PerlIO_sprintf()' functions have been removed. For more information, see the 5.20 perldelta (http://search.cpan.org/dist/perl-5.20.0/pod/perldelta.pod), 5.20.1 perldelta (http://search.cpan.org/dist/perl-5.20.1/pod/perldelta.pod) and 5.20.2 perldelta (http://search.cpan.org/dist/perl-5.20.2/pod/perldelta.pod).