// Copyright (C) 2016-2026 Free Software Foundation, Inc.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_assignments)]

// Use repr(C) and extern "C" to force the compiler to present a
// C-like interface, facilitating inferior calls.

#[repr(C)]
#[derive(Clone, Copy)]
struct Hold<T>(T);

pub extern "C" fn identity<T>(x: T) -> T { x }

fn dowhatever() { () }

pub fn main() {
    let a = identity(23u32);
    let b = identity(23.0f64);

    let d = identity::<u32>(7);

    let e = Hold(7);
    let f = Hold::<u8>(7);

    let g = identity(e);

    let h = Hold(e);
    let i = identity(h);

    let z = ();                          // set breakpoint here
    dowhatever()
}
