[perl #62836] Null PMC access when calling user-declared sub in List:: class

[Carl Mäsak]

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<masak> rakudo: sub List::a {}; <1 2 3>.a
<p6eval> rakudo 36054: OUTPUT«Null PMC access in invoke() [...]

I'm not at all sure subs should be called that way, but a Null PMC
access is always wrong.