[WIP] Enhance interop of generics, roles, and classes, Raku or nqp #808
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- In general, a generic on the RHS can accept anything on the LHS... - ...but a non-generic type on the RHS cannot accept a generic on the LHS... - ...buf if either carry a type signature, we should take advantage of it... - ...mapping type capture to type capture until we find any non-generic type (or Mu). - A return type must not exist on the LHS if one does not exist on the RHS, otherwise it should defer to ACCEPTS as with parameters.
Unlike before: - Spare any unnecessary &EVAL nonsense. - Ensure that generic doees, parents, and a complicated blend of the two can typecheck. - Ensure we can access the doees list before composition (as typechecks may depend on it).
Because the cons of picking Array for type objects (need to decont for `=:=`. not a normal array otherwise) outweigh the pros of mutability here.
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See rakudo/rakudo#4936. @lizmat may be interested in some TODOs now passing.