This pod discusses the new experimental feature listed in the
diagnostics section. Refer to that.
no warnings "experimental::declared_refs";
use feature "declared_refs";
+See L</Declaring a reference to a variable>.
+
=item *
L<Version control conflict marker|perldiag/"Version control conflict marker">
use feature "declared_refs";
$fooref = my \$foo;
+See L</Declaring a reference to a variable>.
+
=item *
L<C<${^ENCODING}> is no longer supported. Its use will be fatal in Perl 5.28|perldiag/"${^ENCODING} is no longer supported. Its use will be fatal in Perl 5.28">