From @colomon

colomon​: rakudo​: (1..3).map({$_ => $_*$_}).perl.say
p6eval​: rakudo e5a63d​: OUTPUT«Use of uninitialized value␤Use of
uninitialized value␤Use of uninitialized value␤Null PMC access in
invoke()␤in Main (/tmp/xCUuiEBOsh​:2)␤»

I understand that this code should not work, but it shouldn't Null PMC
access either.

On the other hand, not sure if this one should work or not​:

colomon​: rakudo​: (1..3).map({$_ => $_*$_;}).perl.say
p6eval​: rakudo e5a63d​: OUTPUT«Use of uninitialized value␤Use of
uninitialized value␤Use of uninitialized value␤Null PMC access in
invoke()␤in Main (/tmp/8McBNVU08o​:2)␤»

--
Solomon Foster​: colomon@​gmail.com
HarmonyWare, Inc​: http://www.harmonyware.com

From @bbkr

It's

ppabian@​b-gr-dev​:~/rakudo$ perl6 -e '(1..3).map({$_ => $_*$_}).perl.say'
No candidates found to invoke

on Moscow build.

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

From @bbkr

And

$ perl6 -e '(1..3).map({$_ => $_*$_}).perl.say'
Use of uninitialized value in numeric context
Use of uninitialized value in numeric context
No candidates found to invoke
  in main program body at line 1

on Kiev build

From @bbkr

NOM

bbkr​:nom bbkr$ ./perl6 -e '(1..3).map({$_ => $_*$_}).perl.say'
Use of uninitialized value in numeric context
Use of uninitialized value in numeric context
Use of uninitialized value in string context
Method 'count' not found for invocant of class 'Hash'
  in method reify at src/gen/CORE.setting​:3634
  in method reify at src/gen/CORE.setting​:3539
  in method gimme at src/gen/CORE.setting​:3876
  in method perl at src/gen/CORE.setting​:4055

From @diakopter

On Sun Sep 11 02​:50​:58 2011, bbkr wrote​:

NOM

bbkr​:nom bbkr$ ./perl6 -e '(1..3).map({$_ => $_*$_}).perl.say'
Use of uninitialized value in numeric context
Use of uninitialized value in numeric context
Use of uninitialized value in string context
Method 'count' not found for invocant of class 'Hash'
in method reify at src/gen/CORE.setting​:3634
in method reify at src/gen/CORE.setting​:3539
in method gimme at src/gen/CORE.setting​:3876
in method perl at src/gen/CORE.setting​:4055

new behavior. However, note what happens when I add another {} around
it.

15​:50 < diakopter> r​: (1..3).map({$_ => $_*$_}).perl.say
15​:51 <+p6eval> rakudo 3b1596​: OUTPUT«use of uninitialized variable $_
of type Any in
  numeric context in block <anon> at
/tmp/2hcyev09Jp​:1␤␤use of uninitialized
  variable $_ of type Any in numeric context in block
<anon> at
  /tmp/2hcyev09Jp​:1␤␤use of uninitialized variable $!key
of type Any in
  string c…
15​:51 < diakopter> r​: (1..3).map({{$_ => $_*$_}}).perl.say
15​:51 <+p6eval> rakudo 3b1596​: OUTPUT«({"1" => 1}, {"2" => 4}, {"3" =>
9}).list␤»

From @moritz

Now tested in S06-other/anon-hashes-vs-blocks.t

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