Merge pull request #8663 from practicalswift/swiftc-28738-impl-genericparams-empty-key-depth-impl-genericparams-back-getdepth-key-index-im

Author: swift-ci

validation-test/compiler_crashers/28738-impl-genericparams-empty-key-depth-impl-genericparams-back-getdepth-key-index-im.swift

@@ -0,0 +1,10 @@
+// This source file is part of the Swift.org open source project
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+// REQUIRES: asserts
+// RUN: not --crash %target-swift-frontend %s -emit-ir
+protocol P}extension P{{}typealias a:P}extension P.a{protocol P