From @dwarring

The following is derived from http://perl6advent.wordpress.com/2012/12/22/day-22-parsing-an-ipv4-address/

$_ = "Go 127.0.0.1, I said!....";
{
  say .list>>.Str.perl;
  say $_.perl;
} for m​:g/ (\d+)+ % '.' /;

rakudo-2012.11​:
("127", "0", "0", "1")
Match.new(orig => "Go 127.0.0.1, I said!....", from => 3, to => 12, ast => Any, list => ((Match.new(orig => "Go 127.0.0.1, I said!....", \
from => 3, to => 6, ast => Any, list => ().list, hash => EnumMap.new()), Match.new(orig => "Go 127.0.0.1, I said!....", from => 7, to => \
8, ast => Any, list => ().list, hash => EnumMap.new()), Match.new(orig => "Go 127.0.0.1, I said!....", from => 9, to => 10, ast => Any, l\
ist => ().list, hash => EnumMap.new()), Match.new(orig => "Go 127.0.0.1, I said!....", from => 11, to => 12, ast => Any, list => ().list,\
hash => EnumMap.new())),).list, hash => EnumMap.new())

rakudo 2014.04-134-gfd5f8eb (all backends)​:
("127 0 0 1",)
Match.new(orig => "Go 127.0.0.1, I said!....", from => 3, to => 12, ast => Any, list => ([Match.new(orig => "Go 127.0.0.1, I said!....", \
from => 3, to => 6, ast => Any, list => ().list, hash => EnumMap.new()), Match.new(orig => "Go 127.0.0.1, I said!....", from => 7, to => \
8, ast => Any, list => ().list, hash => EnumMap.new()), Match.new(orig => "Go 127.0.0.1, I said!....", from => 9, to => 10, ast => Any, l\
ist => ().list, hash => EnumMap.new()), Match.new(orig => "Go 127.0.0.1, I said!....", from => 11, to => 12, ast => Any, list => ().list,\
hash => EnumMap.new())],).list, hash => EnumMap.new())

In summary there seems to have been a slight change in the structure of the capture which has broken this use of the .list() method

From @ShimmerFairy

Behavior has changed in rakudo​:

<ShimmerFairy> m​: say ("Go 127.0.0.1, I said! He went to 173.194.32.32." ~~ m​:g/ (\d ** 1..3) ** 4 % '.' /).map(*.list».Str.perl)
<camelia> rakudo-moar 5ba44f​: OUTPUT«(["127", "0", "0", "1"],) (["173", "194", "32", "32"],)␤»

And on current GLR​:

<ShimmerFairy> m​: say ("Go 127.0.0.1, I said! He went to 173.194.32.32." ~~ m​:g/ (\d ** 1..3) ** 4 % '.' /).map(*.list».Str.perl)
<GLRelia> rakudo-moar 36ea47​: OUTPUT«(($["127", "0", "0", "1"]) ($["173", "194", "32", "32"]))␤»

Without the .perl in the map, on nom it's a List of Parcel of Array, and on GLR it's a Seq of List of Array. (Using .list or .eager on the Seq would result in a List of List of Array.)

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

From @dwarring

I don't think we need the outer array, which only ever contains one element. How about​:

  $_ = "Go 127.0.0.1, I said! He went to 173.194.32.32.";
  say .list>>.Str.[0].perl for m​:g/ (\d ** 1..3) ** 4 % '.' /;
  # output​:
  # ["127", "0", "0", "1"]
  # ["173", "194", "32", "32"]

On Sun Aug 30 20​:52​:15 2015, lue wrote​:

Behavior has changed in rakudo​:

<ShimmerFairy> m​: say ("Go 127.0.0.1, I said! He went to
173.194.32.32." ~~ m​:g/ (\d ** 1..3) ** 4 % '.'
/).map(*.list».Str.perl)
<camelia> rakudo-moar 5ba44f​: OUTPUT«(["127", "0", "0", "1"],)
(["173", "194", "32", "32"],)␤»

And on current GLR​:

<ShimmerFairy> m​: say ("Go 127.0.0.1, I said! He went to
173.194.32.32." ~~ m​:g/ (\d ** 1..3) ** 4 % '.'
/).map(*.list».Str.perl)
<GLRelia> rakudo-moar 36ea47​: OUTPUT«(($["127", "0", "0", "1"])
($["173", "194", "32", "32"]))␤»

Without the .perl in the map, on nom it's a List of Parcel of Array,
and on GLR it's a Seq of List of Array. (Using .list or .eager on the
Seq would result in a List of List of Array.)

From @dwarring

I've modified and unfudged the test in advent2012-day22.t

Taking this as the new idiom and closing this ticket.

On Mon Aug 31 15​:41​:04 2015, david.warring wrote​:

I don't think we need the outer array, which only ever contains one
element. How about​:

$_ = "Go 127.0.0.1, I said! He went to 173.194.32.32.";
say .list>>.Str.[0].perl for m​:g/ (\d ** 1..3) ** 4 % '.' /;
# output​:
# ["127", "0", "0", "1"]
# ["173", "194", "32", "32"]

On Sun Aug 30 20​:52​:15 2015, lue wrote​:

Behavior has changed in rakudo​:

<ShimmerFairy> m​: say ("Go 127.0.0.1, I said! He went to
173.194.32.32." ~~ m​:g/ (\d ** 1..3) ** 4 % '.'
/).map(*.list».Str.perl)
<camelia> rakudo-moar 5ba44f​: OUTPUT«(["127", "0", "0", "1"],)
(["173", "194", "32", "32"],)␤»

And on current GLR​:

<ShimmerFairy> m​: say ("Go 127.0.0.1, I said! He went to
173.194.32.32." ~~ m​:g/ (\d ** 1..3) ** 4 % '.'
/).map(*.list».Str.perl)
<GLRelia> rakudo-moar 36ea47​: OUTPUT«(($["127", "0", "0", "1"])
($["173", "194", "32", "32"]))␤»

Without the .perl in the map, on nom it's a List of Parcel of Array,
and on GLR it's a Seq of List of Array. (Using .list or .eager on the
Seq would result in a List of List of Array.)

@dwarring - Status changed from 'open' to 'resolved'