[perl #64078] Null PMC access when calling .arity on a non-defined sub in Rakudo

[Carl Mäsak]

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<masak> rakudo: say &foo.arity
<p6eval> rakudo de786f: OUTPUT«Null PMC access in can()␤current
instr.: '!dispatch_method' pc 17078 (src/builtins/guts.pir:104)␤»
* masak submits rakudobug