From @AlexDaniel

Code​:
my @​a[3;3]; for @​a.pairs -> $p { $p.value = $++ }; say @​a.perl

Result (2015.12,2016.10)​:
Array.new(​:shape(3, 3), [0, 1, 2], [3, 4, 5], [6, 7, 8])

Result (2016.11,HEAD)​:
Cannot modify an immutable Mu
in block <unit> at /tmp/kUSl3oiqTO line 1

Bisectable points to rakudo/rakudo@0f2566a

Not sure if the previous behavior was right, I'm just pointing out what was changed and what kind of code it could've broken (after all, somebody actually tried this on camelia).

From @AlexDaniel

Oh wait, there's more!

Code​:
my @​a[5] = 1, 2, 3, 4; for @​a.values <-> $a { $a = 42 }; say @​a

Result (2015.12,2016.10)
[42 42 42 42 42]

Result (2016.11,HEAD)​:
X​::TypeCheck​::Binding exception produced no message
  in block <unit> at /tmp/67YIIistWY line 1

On 2016-12-29 08​:32​:02, alex.jakimenko@​gmail.com wrote​:

Code​:
my @​a[3;3]; for @​a.pairs -> $p { $p.value = $++ }; say @​a.perl

Result (2015.12,2016.10)​:
Array.new(​:shape(3, 3), [0, 1, 2], [3, 4, 5], [6, 7, 8])

Result (2016.11,HEAD)​:
Cannot modify an immutable Mu
in block <unit> at /tmp/kUSl3oiqTO line 1

Bisectable points to
rakudo/rakudo@0f2566a

Not sure if the previous behavior was right, I'm just pointing out
what was changed and what kind of code it could've broken (after all,
somebody actually tried this on camelia).

From @lizmat

Fixed with dc7b688 , tests needed.

On 29 Dec 2016, at 17​:32, Aleks-Daniel Jakimenko-Aleksejev (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by Aleks-Daniel Jakimenko-Aleksejev
# Please include the string​: [perl #​130440]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=130440 >

Code​:
my @​a[3;3]; for @​a.pairs -> $p { $p.value = $++ }; say @​a.perl

Result (2015.12,2016.10)​:
Array.new(​:shape(3, 3), [0, 1, 2], [3, 4, 5], [6, 7, 8])

Result (2016.11,HEAD)​:
Cannot modify an immutable Mu
in block <unit> at /tmp/kUSl3oiqTO line 1

Bisectable points to rakudo/rakudo@0f2566a

Not sure if the previous behavior was right, I'm just pointing out what was changed and what kind of code it could've broken (after all, somebody actually tried this on camelia).

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

From @AlexDaniel

Another problem mentioned in the comment is not fixed. Want me to create another ticket for that?

On 2016-12-29 12​:32​:59, elizabeth wrote​:

Fixed with dc7b688 , tests needed.

On 29 Dec 2016, at 17​:32, Aleks-Daniel Jakimenko-Aleksejev (via RT)
<perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by Aleks-Daniel Jakimenko-Aleksejev
# Please include the string​: [perl #​130440]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=130440 >

Code​:
my @​a[3;3]; for @​a.pairs -> $p { $p.value = $++ }; say @​a.perl

Result (2015.12,2016.10)​:
Array.new(​:shape(3, 3), [0, 1, 2], [3, 4, 5], [6, 7, 8])

Result (2016.11,HEAD)​:
Cannot modify an immutable Mu
in block <unit> at /tmp/kUSl3oiqTO line 1

Bisectable points to
rakudo/rakudo@0f2566a

Not sure if the previous behavior was right, I'm just pointing out
what was changed and what kind of code it could've broken (after all,
somebody actually tried this on camelia).

From @zoffixznet

Tests in Raku/roast@1f5dead548

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