rust/tests/run-make/lib-trait-for-trait-no-ice/rmake.rs

// Inside a library, implementing a trait for another trait
// with a lifetime used to cause an internal compiler error (ICE).
// This test checks that this bug does not make a resurgence -
// first by ensuring successful compilation, then verifying that
// the lib crate-type flag was actually followed.
// See https://github.com/rust-lang/rust/issues/18943

use std::path::Path;

use run_make_support::{rust_lib_name, rustc};

fn main() {
    rustc().input("foo.rs").crate_type("lib").run();
    assert!(Path::new(&rust_lib_name("foo")).exists());
}