Doug Gregor dc7a251d4c [SubstitutionMap] Handle substitution of non-canonical generic parameters. ...

SubstitutionMap::lookupSubstitution() assumed that any type parameter it was
given would already be canonical, and fail (return a null Type) when given
a type parameter that was equivalent to another type parameter but is
not itself canonical. Canonicalize, recursive, and record the replacement
type appropriately.

2018-05-11 13:18:06 -07:00

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