Doug Gregor b59c30c1af [SE-0143] Put conditional conformances behind an "experimental" flag. ...

Conditional conformances aren't quite ready yet for Swift 4.1, so
introduce the flag `-enable-experimental-conditional-conformances` to
enable conditional conformaces, and an error when one declares a
conditional conformance without specifying the flag.

Add this flag when building the standard library (which will vend
conditional conformances) and to all of the tests that need it.

Fixes rdar://problem/35728337.

2017-11-28 16:01:51 -08:00

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