[perl #69608] [BUG] Null PMC access when doing 'nextwith' and there's no matching candidate in the candidate list in Rakudo

[Carl Mäsak]

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<masak> rakudo: class A { multi method foo() { say "foo1" }; multi
method foo($x) { say "foo2"; nextwith() } }; A.new.foo(42)
<p6eval> rakudo f845cc: OUTPUT«foo2␤Null PMC access in isa()␤in method
A::foo [...]
<masak> mwhahaha.
* masak submits rakudobug
<masak> rakudo: class A { multi method foo($x) { say "foo2";
nextwith() } }; A.new.foo(42)
<p6eval> rakudo f845cc: OUTPUT«foo2␤Null PMC access in isa()␤in method
A::foo [...]
<jnthn> huh, it blows up when there's nowhere to defer to?
<jnthn> ouch.
<masak> jnthn: but in the first example, isn't there somewhere to defer to?
<jnthn> masak: Very debatable.
<masak> why?
<masak> because it isn't in the original list of candidates?
<jnthn> Right.
<masak> understood.
<jnthn> And if we decide to re-generate the list, we get ourselves
into even more "fun".
* masak shudders
<jnthn> I still need to write a mail to p6l on that issue.
<jnthn> And try and get a design decision.