// RUN: %empty-directory(%t)
// RUN: %target-build-swift -emit-module -o %t/Test.swiftmodule -emit-module-interface-path %t/Test.swiftinterface -module-name Test -enable-library-evolution -swift-version 5 %s
// RUN: %FileCheck %s < %t/Test.swiftinterface

public protocol P {
}

public class Foo<T> : P {
  public struct Nested {}
}

extension P {
  public static func blah1<T>(_: Self) where Self == Foo<T> {}
  public static func blah2<T>(_: Self.Nested) where Self == Foo<T> {}

  public static func blah3<T>(_: Self) where Self : Foo<T> {}
  public static func blah4<T>(_: Self.Nested) where Self : Foo<T> {}
}

// CHECK-LABEL: extension Test.P {
// CHECK-NEXT:    public static func blah1<T>(_: Self) where Self == Test.Foo<T>
// CHECK-NEXT:    public static func blah2<T>(_: Test.Foo<T>.Nested) where Self == Test.Foo<T>
// CHECK-NEXT:    public static func blah3<T>(_: Self) where Self : Test.Foo<T>
// CHECK-NEXT:    public static func blah4<T>(_: Test.Foo<T>.Nested) where Self : Test.Foo<T>
// CHECK-NEXT:  }