|  | // Copyright (C) 2016-2025 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)] | 
|  |  | 
|  |  | 
|  | #[derive(Clone, Copy)] | 
|  | struct Hold<T>(T); | 
|  |  | 
|  | pub 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() | 
|  | } |