[perl #62892] Rakudo dies when trying to do 'is' inheritance on a role

[Carl Mäsak]

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<masak> rakudo: role A {}; class B is A {}
<p6eval> rakudo 36139: OUTPUT«Null PMC access in get_string() [...]
* masak submits rakudobug

I haven't checked in the specs what this should do, but STD says it's allowed.