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perldelta for 90595091f, revert uncondition CvOUTSIDE references #22894

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perldelta for 90595091f, revert uncondition CvOUTSIDE references #22894

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Expand Up @@ -45,6 +45,26 @@ XXX For a release on a stable branch, this section aspires to be:

[ List each incompatible change as a =head2 entry ]

=head2 Removed containing function references for functions without eval

5.40 reintroduced unconditional references from functions to their
containing functions to fix a bug introduced in 5.18 that broke the
special behaviour of C<eval EXPR> in package C<DB> which is used by
the debugger.

In some cases this change led to circular reference chains between
closures and other existing references, resulting in memory leaks.

This change has been reverted, fixing [GH #22547] but re-breaking [GH
#19370].

This means the reference loops won't occur, and that lexical variables
and functions from enclosing functions may not be visible in the
debugger.

Note that calling C<eval EXPR> in a function unconditionally causes a
function to reference its enclosing functions as it always has.

=head1 Deprecations

XXX Any deprecated features, syntax, modules etc. should be listed here.
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