diff options
Diffstat (limited to 'tests/ui/mir/mir_calls_to_shims.rs')
-rw-r--r-- | tests/ui/mir/mir_calls_to_shims.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/tests/ui/mir/mir_calls_to_shims.rs b/tests/ui/mir/mir_calls_to_shims.rs new file mode 100644 index 000000000..9dc0acfbf --- /dev/null +++ b/tests/ui/mir/mir_calls_to_shims.rs @@ -0,0 +1,49 @@ +// 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() -> !); +} |