rust/src/test/ui/run-pass/issues/issue-38763.rs

// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// ignore-emscripten

#[repr(C)]
pub struct Foo(i128);

#[no_mangle]
pub extern "C" fn foo(x: Foo) -> Foo { x }

fn main() {
    foo(Foo(1));
}