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// run-rustfix
// needs-unwind
#![deny(rust_2021_incompatible_closure_captures)]
//~^ NOTE: the lint level is defined here
#![feature(fn_traits)]
#![feature(never_type)]
use std::panic;
fn foo_diverges() -> ! {
panic!()
}
fn assert_panics<F>(f: F)
where
F: FnOnce(),
{
let f = panic::AssertUnwindSafe(f);
let result = panic::catch_unwind(move || {
let _ = &f;
//~^ ERROR: changes to closure capture in Rust 2021 will affect which traits the closure implements [rust_2021_incompatible_closure_captures]
//~| NOTE: in Rust 2018, this closure implements `UnwindSafe`
//~| NOTE: in Rust 2018, this closure implements `RefUnwindSafe`
//~| NOTE: for more information, see
//~| HELP: add a dummy let to cause `f` to be fully captured
f.0()
//~^ NOTE: in Rust 2018, this closure captures all of `f`, but in Rust 2021, it will only capture `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_panic(foo_diverges);
test_fn_ptr_panic(foo_diverges as fn() -> !);
}
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