tests/ui/mir/issue-92893.rs - toolchain/rustc - Git at Google

 struct Bug<A = [(); (let a = (), 1).1]> {
     //~^ ERROR expected expression, found `let` statement
     a: A
 }

 fn main() {}
	struct Bug<A = [(); (let a = (), 1).1]> {
	//~^ ERROR expected expression, found `let` statement
	a: A
	}

	fn main() {}