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Strange return type on &-sigilled attributes with where clauses. #1798
Class attributes with & sigil and a where clause are given a mysterious anon return type.
This only happens to attributes, not class variables.
Somewhat related: #1414
But basically in this context, the variable (attribute) is parametarized with anonymous subset with that where clause and the callable being given to it isn't, so it rejects it. If it were possible to use a