From @masak

<masak> std​: my %h = not => 42;
<camelia> std 14ad63b​: OUTPUT«ok 00​:00 137m␤»
<masak> m​: my %h = not => 42;
<camelia> rakudo-moar 315ec6​: OUTPUT«===SORRY!=== Error while
compiling /tmp/uZK1u3tWdg␤Malformed initializer␤at
/tmp/uZK1u3tWdg​:1␤------> my %h = not ⏏=> 42; [...]
* masak submits rakudobug
<masak> m​: my %h = 'not' => 42; # workaround
<camelia> rakudo-moar 315ec6​: ( no output )

From @usev6

This works now​:

$ perl6 -e 'my %h = not => 42; say %h.perl'
("not" => 42).hash

I added a test to S02-types/hash.t with commit Raku/roast@83da5c2c81

I'm closing this ticket as 'resolved'.

@usev6 - Status changed from 'new' to 'resolved'