From @grondilu

$ cat > A.pm6
unit module A;

constant @​a is export = map { (1 +< $_) => 1 }, ^3;

$ PERL6LIB=. perl6 -e 'use A; say @​a[1];'
Cannot invoke this object
  in block at /home/grondilu/A.pm6 (A) line 3
  in block <unit> at -e line 1

$ perl6 -e 'module A { constant @​a is export = map { (1 +< $_) => 1 }, ^3;
}; import A; say @​a[1];'
2 => 1

$ perl6 --version
This is Rakudo version 2016.03-88-g600eb53 built on MoarVM version
2016.03-84-g4afd7b6
implementing Perl 6.c.

From @jonathanstowe

It looks like the $!block of the MapIter isn't surviving precompilation.

Cannot invoke this object
  at /home/jonathan/devel/perl6/A.pm (A)​:3 (/home/jonathan/devel/perl6/.precomp/CA7216BD3C200837F18683285874D142EF787206.1460060190.82819/D6/D6A0A528F91D5E0AF8AA4B10BF2365224AEC4D53​:)
from gen/moar/m-CORE.setting​:4111 (/home/jonathan/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm​:pull-one)
from gen/moar/m-CORE.setting​:2381 (/home/jonathan/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm​:push-exactly)
from gen/moar/m-CORE.setting​:2395 (/home/jonathan/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm​:push-at-least)
from gen/moar/m-CORE.setting​:14297 (/home/jonathan/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm​:reify-at-least)

with

Rakudo version 2016.03-98-g61d231c built on MoarVM version 2016.03-84-g4afd7b6

From @zoffixznet

Still present in 2016.06-154-g55c359e built on MoarVM version 2016.06-9-g8fc21d5

From @jnthn

Once this is fixed, a workaround in OO​::Monitors can also be removed.

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

From @LLFourn

merged patch​: rakudo/rakudo#1111
tests​: https://github.com/perl6/roast/pull/291/files
can be closed

On Fri, Apr 8, 2016 at 7​:16 PM grondilu@​yahoo.fr <
perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by grondilu@​yahoo.fr
# Please include the string​: [perl #​127858]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=127858 >

$ cat > A.pm6
unit module A;

constant @​a is export = map { (1 +< $_) => 1 }, ^3;

$ PERL6LIB=. perl6 -e 'use A; say @​a[1];'
Cannot invoke this object
in block at /home/grondilu/A.pm6 (A) line 3
in block <unit> at -e line 1

$ perl6 -e 'module A { constant @​a is export = map { (1 +< $_) => 1 }, ^3;
}; import A; say @​a[1];'
2 => 1

$ perl6 --version
This is Rakudo version 2016.03-88-g600eb53 built on MoarVM version
2016.03-84-g4afd7b6
implementing Perl 6.c.

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

From @LLFourn

Fix reverted​:
rakudo/rakudo@50d38a1

should be re-opened :)

On Tue, Jul 25, 2017 at 11​:45 PM Lloyd Fournier via RT <
perl6-bugs-followup@​perl.org> wrote​:

merged patch​: rakudo/rakudo#1111
tests​: https://github.com/perl6/roast/pull/291/files
can be closed

On Fri, Apr 8, 2016 at 7​:16 PM grondilu@​yahoo.fr <
perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by grondilu@​yahoo.fr
# Please include the string​: [perl #​127858]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=127858 >

$ cat > A.pm6
unit module A;

constant @​a is export = map { (1 +< $_) => 1 }, ^3;

$ PERL6LIB=. perl6 -e 'use A; say @​a[1];'
Cannot invoke this object
in block at /home/grondilu/A.pm6 (A) line 3
in block <unit> at -e line 1

$ perl6 -e 'module A { constant @​a is export = map { (1 +< $_) => 1 },
^3;
}; import A; say @​a[1];'
2 => 1

$ perl6 --version
This is Rakudo version 2016.03-88-g600eb53 built on MoarVM version
2016.03-84-g4afd7b6
implementing Perl 6.c.