// 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 %target-swift-frontend %s -emit-ir
protocol A:RangeReplaceableCollection&(t:A{extension{}a e:class a{}class a
{{}lass a=_{case.a<a =nil??as?=
:a<a
?as?=