[Tests] NFC: Add a test-case for self-conforming protocols and Copyable interaction

Author: xedin

test/Generics/copyable_and_self_conforming_protocols.swift

@@ -0,0 +1,20 @@
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -enable-experimental-feature NoncopyableGenerics -enable-experimental-feature NonescapableTypes %s -verify
+
+// REQUIRES: objc_interop
+// REQUIRES: asserts
+
+import Foundation
+
+@objc protocol MyResult {
+}
+
+class Request<T : MyResult> {
+}
+
+struct Test {
+  let closure: (Request<MyResult>) -> Void
+
+  func test<R>(_ request: Request<R>) {
+    self.closure(request as! Request<MyResult>)
+  }
+}