[perl #124017] [BUG] Shouldn't be allowed to declare a class called `Foo:D` in Rakudo

[Carl Mäsak]

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<masak> m: class Foo:D {}; say Foo.new
<camelia> rakudo-moar 459c63: OUTPUT«Foo.new()␤»
* masak submits rakudobug
<masak> (the bug being that that `:D` is allowed on a class declaration)