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=head1 NAME

perl5200delta - what is new for perl v5.20.0

=head1 DESCRIPTION

This document describes differences between the 5.18.0 release and the
5.20.0 release.

If you are upgrading from an earlier release such as 5.16.0, first read
L<perl5180delta>, which describes differences between 5.16.0 and 5.18.0.

=head1 Core Enhancements

=head2 Experimental Subroutine signatures

Declarative syntax to unwrap argument list into lexical variables.
C<sub foo ($a,$b) {...}> checks the number of arguments and puts the
arguments into lexical variables.  Signatures are not equivalent to
the existing idiom of C<sub foo { my($a,$b) = @_; ... }>.  Signatures
are only available by enabling a non-default feature, and generate
warnings about being experimental.  The syntactic clash with
prototypes is managed by disabling the short prototype syntax when
signatures are enabled.

See L<perlsub/Signatures> for details.

=head2 C<sub>s now take a C<prototype> attribute

When declaring or defining a C<sub>, the prototype can now be specified inside
of a C<prototype> attribute instead of in parens following the name.

For example, C<sub foo($$){}> could be rewritten as
C<sub foo : prototype($$){}>.

=head2 More consistent prototype parsing

Multiple semicolons in subroutine prototypes have long been tolerated and
treated as a single semicolon.  There was one case where this did not
happen.  A subroutine whose prototype begins with "*" or ";*" can affect
whether a bareword is considered a method name or sub call.  This now
applies also to ";;;*".

Whitespace has long been allowed inside subroutine prototypes, so
C<sub( $ $ )> is equivalent to C<sub($$)>, but until now it was stripped
when the subroutine was parsed.  Hence, whitespace was I<not> allowed in
prototypes set by C<Scalar::Util::set_prototype>.  Now it is permitted,
and the parser no longer strips whitespace.  This means
C<prototype &mysub> returns the original prototype, whitespace and all.

=head2 C<rand> now uses a consistent random number generator

Previously perl would use a platform specific random number generator, varying
between the libc rand(), random() or drand48().

This meant that the quality of perl's random numbers would vary from platform
to platform, from the 15 bits of rand() on Windows to 48-bits on POSIX
platforms such as Linux with drand48().

Perl now uses its own internal drand48() implementation on all platforms.  This
does not make perl's C<rand> cryptographically secure.  [perl #115928]

=head2 New slice syntax

The new C<%hash{...}> and C<%array[...]> syntax returns a list of key/value (or
index/value) pairs.  See L<perldata/"Key/Value Hash Slices">.

=head2 Experimental Postfix Dereferencing

When the C<postderef> feature is in effect, the following syntactical
equivalencies are set up:

  $sref->$*;  # same as ${ $sref }  # interpolates
  $aref->@*;  # same as @{ $aref }  # interpolates
  $href->%*;  # same as %{ $href }
  $c