[perl #78314] [BUG] The type object of a class that has only had a { ... } declaration yields Failure in Rakudo

[Carl Mäsak]

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<masak> rakudo: role Bottle[::T] { method Str { "a bottle of {T}" } };
class Wine { ... }; say Bottle[Wine].new
<p6eval> rakudo 5bdbd4: OUTPUT«a bottle of Failure()␤»
<masak> oh la la
* masak submits rakudobug