// 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

struct X<T, y: d where Optional<T : end: U, y)
b<S : A? {
convenience init() {
struct c : d {
func i(v: T.a: Co
