Slava Pestov 7cbd0c0b37 Sema: Lift restriction on classes conforming to protocols with default implementations returning 'Self' ...

Now that we pass in the correct type metadata for 'Self', it is
sound for a class to conform to a protocol with a default implementation
for a method returning 'Self'.

Fixes <rdar://problem/23671426>.

2017-10-09 19:53:51 -07:00

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