Merge pull request #4832 from practicalswift/swiftc-28421-swift-constraints-constraintsystem-diagnosefailureforexpr
diff --git a/validation-test/compiler_crashers/28421-swift-constraints-constraintsystem-diagnosefailureforexpr.swift b/validation-test/compiler_crashers/28421-swift-constraints-constraintsystem-diagnosefailureforexpr.swift
new file mode 100644
index 0000000..b7da7a2
--- /dev/null
+++ b/validation-test/compiler_crashers/28421-swift-constraints-constraintsystem-diagnosefailureforexpr.swift
@@ -0,0 +1,14 @@
+// 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 -parse
+// REQUIRES: asserts
+{
+extension{{
+}init(){a{}{
+for b
+(
