New upstream version 1.55.0+dfsg1

[rustc.git] / src / test / ui / closures / 2229_closure_analysis / migrations / mir_calls_to_shims.rs

// run-rustfix

#![deny(rust_2021_incompatible_closure_captures)]
//~^ NOTE: the lint level is defined here
// ignore-wasm32-bare compiled with panic=abort by default
#![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 || {
        //~^ ERROR: `UnwindSafe`, `RefUnwindSafe` trait implementation for closure
        //~| NOTE: in Rust 2018, this closure would implement `UnwindSafe`, `RefUnwindSafe` as `f` implements `UnwindSafe`, `RefUnwindSafe`, but in Rust 2021, this closure would no longer implement `UnwindSafe`, `RefUnwindSafe` as `f.0` does not implement `UnwindSafe`, `RefUnwindSafe`
        //~| NOTE: for more information, see
        //~| HELP: add a dummy let to cause `f` to be fully captured
        f.0()
        //~^ NOTE: in Rust 2018, closure captures all of `f`, but in Rust 2021, it only captures `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() -> !);
}