rust/tests/ui/nll/mir_check_cast_unsafe_fn.rs

12 lines
352 B
Rust

#![allow(dead_code)]
fn bar<'a>(input: &'a u32, f: fn(&'a u32) -> &'a u32) -> &'static u32 {
// Here the NLL checker must relate the types in `f` to the types
// in `g`. These are related via the `UnsafeFnPointer` cast.
let g: unsafe fn(_) -> _ = f;
unsafe { g(input) }
//~^ ERROR lifetime may not live long enough
}
fn main() {}