[perl #104760] Stubbing does not work for multi-joined namespaces

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# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #104760]
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11:41 < moritz> nom: class X::Foo { ... }; class X::Foo { }
11:41 <+p6eval> nom 2154eb: OUTPUT«===SORRY!===␤The following packages 
were stubbed but not defined:␤    X::Foo␤␤»
11:42 < moritz> jnthn: ^^ that one is blocking me on the exceptions stuff

(The actual case that interests me is with lexical classes).