[perl #77274] [BUG] Class cannot inherit first from parent and then from grandparent in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: class A { method foo { say "OH HAI" } }; class B is A
{}; class C is A is B {}; say "alive"; C.new.*foo
<p6eval> rakudo 85602a: OUTPUT«===SORRY!===␤Could not build C3
linearization: ambiguous hierarchy␤»
* masak submits rakudobug
<masak> it's a good day when I find something amiss in the OO system. :)
<masak> rakudo: class A { method foo { say "OH HAI" } }; class B is A
{}; class C is B is A {}; say "alive"; C.new.*foo
<p6eval> rakudo 85602a: OUTPUT«alive␤OH HAI␤»
<masak> interesting.

Apart from some cases of MRO, the order of the parent classes
shouldn't matter in the declaration.