-If you are upgrading from an earlier release such as 5.21.6, first read
-L<perl5217delta>, which describes differences between 5.21.6 and 5.21.7.
-
-=head1 Notice
-
-XXX Any important notices here
-
-=head1 Core Enhancements
-
-XXX New core language features go here. Summarize user-visible core language
-enhancements. Particularly prominent performance optimisations could go
-here, but most should go in the L</Performance Enhancements> section.
-
-[ List each enhancement as a =head2 entry ]
-
-=head2 The warnings pragma now supports warnings outside of "all"
-
-Ever since perl v5.6.0 we've had no way of adding new warnings without
-retroactively adding them to all existing programs that used C<-w>,
-C<-W> or C<use warnings>.
-
-This caused us to not add new useful warnings out of fear that they
-might unduly burden users who just wanted to upgrade perl and didn't
-want to deal with a bunch of warnings from their existing code.
-
-We now support a way to have our cake and eat it too, and can add new
-warnings to the core going forward through other top-level warning
-categories. See L<the warnings documentation|warnings/Top-level
-warning categories & associated confusion> for details.
-
-=head2 Non-Capturing Regular Expression Flag
-
-Regular expressions now support a C</n> flag that disables capturing
-and filling in C<$1>, C<$2>, etc... inside of groups:
-
- "hello" =~ /(hi|hello)/n; # $1 is not set
-
-This is equivalent to putting C<?:> at the beginning of every capturing group.
-
-See L<perlre/"n"> for more information.