// 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 b{struct T{class A{struct S{struct c{struct d{class a{class A{class a{deinit{protocol A{func c<f:f.U