// RUN: not %target-swift-frontend %s -parse
// Distributed under the terms of the MIT license
// Test case submitted to project by https://github.com/practicalswift (practicalswift)
// Test case found by fuzzing

class d:SequenceType
struct Q{{}class b{class d{class d{
{}class b{struct d{
enum e{
protocol a{class d<T:a