Merge pull request #5740 from practicalswift/swiftc-28490-result-case-not-implemented

Author: swift-ci

validation-test/compiler_crashers/28490-result-case-not-implemented.swift

@@ -0,0 +1,9 @@
+// This source file is part of the Swift.org open source project
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+// RUN: not --crash %target-swift-frontend %s -emit-ir
+{{}typealias{guard{return.h.A>String({