[perl #64386] Null PMC access when assigning to $!attr in a submethod BUILD

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
# Please include the string:  [perl #64386]
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<ruoso> rakudo: class A { has $.foo; submethod BUILD($obj) { $!foo = 7
} }; say A.new.foo;
<p6eval> rakudo c40f3b: OUTPUT«Null PMC access in getprop() [...]
* masak submits rakudobug
<masak> rakudo: class A { has $.a; method foo { self.bar }; submethod
bar { $!a = 7 } }; A.new.foo
<p6eval> rakudo c40f3b:  ( no output )
<masak> something specifically to do with BUILD, then.