tests/ui/wf/wf-dyn-incompatible.rs - toolchain/rustc - Git at Google

 // Check that dyn-incompatible traits are not WF when used as trait object types.
 // Issue #21953.

 trait A {
     fn foo(&self, _x: &Self);
 }

 fn main() {
     let _x: &dyn A; //~ ERROR E0038
 }
	// Check that dyn-incompatible traits are not WF when used as trait object types.
	// Issue #21953.

	trait A {
	fn foo(&self, _x: &Self);
	}

	fn main() {
	let _x: &dyn A; //~ ERROR E0038
	}