// 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 a{struct Q{
class x{
class D{
let a<, {
f in
}}}
}1
protocol a{struct S<T:A{