src/test/ui/orphan-check-diagnostics.rs

// aux-build:orphan_check_diagnostics.rs
// see #22388

extern crate orphan_check_diagnostics;

use orphan_check_diagnostics::RemoteTrait;

trait LocalTrait { fn dummy(&self) { } }

impl<T> RemoteTrait for T where T: LocalTrait {}
//~^ ERROR type parameter `T` must be used as the type parameter for some local type

fn main() {}