Emit error in Swift 4 mode for final protocol extensions#8890

Merged

slavapestov merged 2 commits intoswiftlang:masterfrom

KingOfBrian:bugfix/SR-1762-error-in-swift-4

Apr 21, 2017

Commits on Apr 20, 2017

Only emit compatibility warning in Swift 3 mode
Brian King
committed
Verify behavior of Swift 3 and Swift 4 final protocol extension behavior
Brian King
committed