| // Copyright 2016 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-wasm32-bare compiled with panic=abort by default |
| |
| #![feature(fn_traits)] |
| #![feature(never_type)] |
| |
| use std::panic; |
| |
| fn foo(x: u32, y: u32) -> u32 { x/y } |
| fn foo_diverges() -> ! { panic!() } |
| |
| fn test_fn_ptr<T>(mut t: T) |
| where T: Fn(u32, u32) -> u32, |
| { |
| let as_fn = <T as Fn<(u32, u32)>>::call; |
| assert_eq!(as_fn(&t, (9, 3)), 3); |
| let as_fn_mut = <T as FnMut<(u32, u32)>>::call_mut; |
| assert_eq!(as_fn_mut(&mut t, (18, 3)), 6); |
| let as_fn_once = <T as FnOnce<(u32, u32)>>::call_once; |
| assert_eq!(as_fn_once(t, (24, 3)), 8); |
| } |
| |
| fn assert_panics<F>(f: F) where F: FnOnce() { |
| let f = panic::AssertUnwindSafe(f); |
| let result = panic::catch_unwind(move || { |
| f.0() |
| }); |
| if let Ok(..) = result { |
| panic!("diverging function returned"); |
| } |
| } |
| |
| fn test_fn_ptr_panic<T>(mut t: T) |
| where T: Fn() -> ! |
| { |
| let as_fn = <T as Fn<()>>::call; |
| assert_panics(|| as_fn(&t, ())); |
| let as_fn_mut = <T as FnMut<()>>::call_mut; |
| assert_panics(|| as_fn_mut(&mut t, ())); |
| let as_fn_once = <T as FnOnce<()>>::call_once; |
| assert_panics(|| as_fn_once(t, ())); |
| } |
| |
| fn main() { |
| test_fn_ptr(foo); |
| test_fn_ptr(foo as fn(u32, u32) -> u32); |
| test_fn_ptr_panic(foo_diverges); |
| test_fn_ptr_panic(foo_diverges as fn() -> !); |
| } |