From @zoffixznet

<Zoffix> m​: my $m = 'a 123' ~~ /(\d\d\d)/; dd [$m.list];
<camelia> rakudo-moar 2c95f7​: OUTPUT«[Match.new(ast => Any, list => (), hash => Map.new(()), orig => "a 123", to => 5, from => 2)]␤»
<Zoffix> m​: my $input = '(\d\d\d)'; my $m = 'a 123' ~~ /<$input>/; dd [$m.list];
<camelia> rakudo-moar 2c95f7​: OUTPUT«[]␤»

Expected results​: output is the same, as the $input contains a capture that should capture stuff when interpolated.

From @zoffixznet

<ugexe> m​: my $input = q|(\d\d\d)|; my $rx = rx/<$input>/; my $m = "a 123 456" ~~ m​:g/$rx/; dd [$m.list>>.Str];
<camelia> rakudo-moar 2c95f7​: OUTPUT«["123", "456"]␤»

From @pmichaud

On Wed, Sep 14, 2016 at 05​:10​:55PM -0700, Zoffix Znet wrote​:

<Zoffix> m​: my $input = '(\d\d\d)'; my $m = 'a 123' ~~ /<$input>/; dd [$m.list];
<camelia> rakudo-moar 2c95f7​: OUTPUT«[]␤»

Expected results​: output is the same, as the $input contains a capture that should capture stuff when interpolated.

<$input> is non-capturing, so even though it contains a $0 capture, its result
won't be held by the outermost Match object.

Rewrite to <input=$input> or $0=<$input> and you'll see the resulting capture.

  <pmichaud> m​: my $input = '(\d\d\d)'; my $m = 'a 123' ~~ /<input=$input>/; say $m
  <camelia> rakudo-moar 2c95f7​: OUTPUT«｢123｣␤ input => ｢123｣␤ 0 => ｢123｣␤»
  <pmichaud> m​: my $input = '(\d\d\d)'; my $m = 'a 123' ~~ /$0=<$input>/; say $m
  <camelia> rakudo-moar 2c95f7​: OUTPUT«｢123｣␤ 0 => ｢123｣␤ 0 => ｢123｣␤»

As far as I know, there's not a way to have a "top-level" capturing
interpolation except by using some form of the <foo=...> or $0=<...>
syntax. It's always consider a sub-rule capture.

Rejecting ticket as not-a-bug.

Pm

The RT System itself - Status changed from 'new' to 'open'

@pmichaud - Status changed from 'open' to 'rejected'