[perl #69170] [BUG] Roles are stringified in a less-than-awesome way in Rakudo

[Carl Mäsak]

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<masak> rakudo: role A { method foo { self.Str } }; say A.foo
<p6eval> rakudo a9ff30: OUTPUT«()<0xb6ace1c8>␤»
* masak submits rakudobug

I guess we're punning the role into a class here. Maybe that class
should stringify to 'A()<0xb6ace1c8>' instead of no name before the
parentheses.