Merge pull request #10109 from practicalswift/swiftc-28766-swift-iterativetypechecker-isqualifiedlookupindeclcontextsatisfied-swift-declcon

[swiftc (31 vs. 5544)] Add crasher in swift::IterativeTypeChecker::isQualifiedLookupInDeclContextSatisfied(...)
diff --git a/validation-test/compiler_crashers/28766-swift-iterativetypechecker-isqualifiedlookupindeclcontextsatisfied-swift-declcon.swift b/validation-test/compiler_crashers/28766-swift-iterativetypechecker-isqualifiedlookupindeclcontextsatisfied-swift-declcon.swift
new file mode 100644
index 0000000..b14096b
--- /dev/null
+++ b/validation-test/compiler_crashers/28766-swift-iterativetypechecker-isqualifiedlookupindeclcontextsatisfied-swift-declcon.swift
@@ -0,0 +1,11 @@
+// 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
+
+// RUN: not --crash %target-swift-frontend %s -emit-ir
+protocol P{ a
+typealias e:A.eas ea}class A:Self.a{
+class a:A