[perl #64850] Null PMC access when binding an attribute in a method in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: class A { has $.x; method foo { $!x := 42 } }; my $a =
A.new; $a.foo; say A.x
<p6eval> rakudo c271e1: OUTPUT«Null PMC access in set_attr_str() [...]
* masak submits rakudobug