[perl #78012] [BUG] Null PMC access when doing .assuming on a routine that doesn't resolve/exist in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: class A { method b { 'b' } }; my $a = A.new; my $b =
&A::b.assuming($a); $b()
<p6eval> rakudo 8156be: OUTPUT«Null PMC access in invoke() [...]
<moritz_> LTA error
<masak> rakudo: class A {}; my $a = A.new; &A::b.assuming($a)()
<p6eval> rakudo 8156be: OUTPUT«Null PMC access in invoke() [...]
* masak submits rakudobug
<moritz_> rakudo: class A { our method b { 'b' } }; my $a = A.new;
&A::b.assuming($a)()
<p6eval> rakudo 8156be:  ( no output )
<masak> ash_++ and TimToady++ for discovering it.