From @zoffixznet

# I have the fix; filing for records

The .subst-mutate routine returns a Match object (or Nil) on singular operations or a List of Match objects when :g/​:global is used, as that produces several matches.

The :x option also produces several matches​:

m​: say "1234567".match​: /\d/, :x(5)
rakudo-moar c01fc3​: OUTPUT«(｢1｣ ｢2｣ ｢3｣ ｢4｣ ｢5｣)␤

However, only a single match object is returned when that option is used with .subst-mutate, even though the option does have the desired effect on the substitutions​:

m​: my $x = "1234567"; say $x.subst-mutate​: /\d/, '', :x(5); say $x
rakudo-moar c01fc3​: OUTPUT«｢1｣␤67␤»

From @zoffixznet

Fixed in rakudo/rakudo@f6524e61e8
Tests added in Raku/roast@391ecba7b9

On Wed Sep 28 06​:02​:48 2016, cpan@​zoffix.com wrote​:

# I have the fix; filing for records

The .subst-mutate routine returns a Match object (or Nil) on singular
operations or a List of Match objects when :g/​:global is used, as that
produces several matches.

The :x option also produces several matches​:

m​: say "1234567".match​: /\d/, :x(5)
rakudo-moar c01fc3​: OUTPUT«(｢1｣ ｢2｣ ｢3｣ ｢4｣ ｢5｣)␤

However, only a single match object is returned when that option is
used with .subst-mutate, even though the option does have the desired
effect on the substitutions​:

m​: my $x = "1234567"; say $x.subst-mutate​: /\d/, '', :x(5); say $x
rakudo-moar c01fc3​: OUTPUT«｢1｣␤67␤»

@zoffixznet - Status changed from 'new' to 'resolved'