File: wf-check-fn-def.rs

package info (click to toggle)
rustc 1.87.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 925,564 kB
  • sloc: xml: 158,127; python: 36,039; javascript: 19,761; sh: 19,737; cpp: 18,981; ansic: 13,133; asm: 4,376; makefile: 710; perl: 29; lisp: 28; ruby: 19; sql: 11
file content (21 lines) | stat: -rw-r--r-- 418 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
#![feature(type_alias_impl_trait)]

trait Bar {
    fn bar(&self);
}

type FooFn<B> = impl FnOnce(B);

#[define_opaque(FooFn)]
fn foo<B: Bar>() -> FooFn<B> {
    fn mop<B: Bar>(bar: B) {
        bar.bar()
    }
    mop // NOTE: no function pointer, but function zst item
    //~^ ERROR the trait bound `B: Bar` is not satisfied
}

fn main() {
    let boom: FooFn<u32> = unsafe { core::mem::zeroed() };
    boom(42);
}