mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 07:14:28 +00:00
50 lines
1.2 KiB
Rust
50 lines
1.2 KiB
Rust
//@ run-pass
|
|
//@ needs-unwind
|
|
|
|
#![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() -> !);
|
|
}
|