Michael Ilseman 12fb0bad7b [swift-version] Allow swift-version 4 and tests ...

The recent @escaping on variadic argument closures back-compat fix is
the first Swift 3.0 compatibility behavior that we don't want to carry
forwards indefinitely into the future. To address this, we
version-gate the diagnostic suppression.

Makes it an official compatibility check. Creates new test directory
for compatibility testing. Allow -swift-version 4 so that we can test
it both ways.

2016-10-11 17:42:25 -07:00

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