Doug Gregor cc133b2b46 Implement subtyping and conversion for existential types. The only ...

difference is that a concrete type's conformance to an existential
type is considered a conversion (but not a subtyping). Relationships
between two existential types are (non-trivial) subtyping relationships.


Swift SVN r2718

2012-08-23 00:29:35 +00:00

3.4 KiB

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