From @masak

<moritz> r​: constant %escapes = (^255).map({; chr($_) => sprintf
'%%%02X', $_ }).hash; say %escapes<e>
<p6eval> rakudo 018b27​: OUTPUT«===SORRY!===␤invoke() not implemented
in class 'Undef'␤»
<moritz> r​: constant $a = (^255).map({; $_ => $_ }).hash;
<p6eval> rakudo 018b27​: OUTPUT«===SORRY!===␤invoke() not implemented
in class 'Undef'␤»
<moritz> r​: constant $a = (^255).hash;
<p6eval> rakudo 018b27​: OUTPUT«===SORRY!===␤Odd number of elements
found where hash expected␤»
<moritz> r​: constant $a = (^256).hash;
<p6eval> rakudo 018b27​: ( no output )
<moritz> masak​: wanna submit rakudobug?
* masak submits rakuodbug

From @moritz

note that this only happens within a constant declaration, ie evaluation
at compile time.

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

From @jnthn

On Thu Mar 29 13​:21​:56 2012, masak wrote​:

<moritz> r​: constant %escapes = (^255).map({; chr($_) => sprintf
'%%%02X', $_ }).hash; say %escapes<e>
<p6eval> rakudo 018b27​: OUTPUT«===SORRY!===␤invoke() not implemented
in class 'Undef'␤»
<moritz> r​: constant $a = (^255).map({; $_ => $_ }).hash;
<p6eval> rakudo 018b27​: OUTPUT«===SORRY!===␤invoke() not implemented
in class 'Undef'␤»
<moritz> r​: constant $a = (^255).hash;
<p6eval> rakudo 018b27​: OUTPUT«===SORRY!===␤Odd number of elements
found where hash expected␤»
<moritz> r​: constant $a = (^256).hash;
<p6eval> rakudo 018b27​: ( no output )
<moritz> masak​: wanna submit rakudobug?
* masak submits rakuodbug

Fixed;

constant %escapes = (^255).map({; chr($_) => sprintf '%%%02X', $_
}).hash; say %escapes<e>
%65

Tagging testneeded.

/jnthn

From @moritz

Now tested in S04-declarations/constant.t

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