Merge pull request #5582 from practicalswift/swiftc-28457-unreachable-executed-at-swift-include-swift-ast-cantypevisitor-h-41

Author: swift-ci

validation-test/compiler_crashers/28457-unreachable-executed-at-swift-include-swift-ast-cantypevisitor-h-41.swift

@@ -0,0 +1,11 @@
+// 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
+let a{
+for
+let a{String($0}({