File: type-alias-impl-trait-in-fn-body.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (14 lines) | stat: -rw-r--r-- 374 bytes parent folder | download | duplicates (3) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
//! Test that it is basically not possible to declare *and opaquely use* opaque types
//! in function bodies. This will work again once we have a `#[defines]` attribute

#![feature(type_alias_impl_trait)]

use std::fmt::Debug;

fn main() {
    //~^ ERROR: item does not constrain
    type Existential = impl Debug;

    fn f() -> Existential {}
    println!("{:?}", f());
}