Merge pull request #5575 from practicalswift/swiftc-28456-unreachable-executed-at-swift-lib-ast-module-cpp-614

Author: swift-ci

validation-test/compiler_crashers/28456-unreachable-executed-at-swift-lib-ast-module-cpp-614.swift

@@ -0,0 +1,12 @@
+// 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
+protocol a{typealias B<>:a{}associatedtype e
+struct B<T>:a{
+var:e
+class B<T>:a