[perl #74850] [BUG] Strange error when doing '.= new' on an attribute in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: class A {}; class B { has A $.foo .= new }
<p6eval> rakudo c4857a: OUTPUT«too few positional arguments: 1 passed,
2 (or more) expected [...]
<slavik> s1n: it will take 1 month to do that ...
* masak submits rakudobug
<masak> alpha: class A {}; class B { has A $.foo .= new }
<p6eval> alpha 30e0ed: OUTPUT«error:imcc:syntax error, unexpected
'\n'␤   in file 'EVAL_25' line 186␤Null PMC access in
find_method('new') [...]