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# We need use re 'eval' because we use interpolation and (?{...})
# in the same regexp. Beware of the implications of this directive.
...
   )+
   (?{ @matches = @{$^R}; })  # Success! Save the result.
/x;

sub flatten_list {
   my ($rv, $p) = @_;
...
   )+
   (?{ flatten_list \@matches, $^R })
/x;