File: sub-principals.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, forky, sid, trixie, trixie-backports, trixie-proposed-updates
  • 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 (27 lines) | stat: -rw-r--r-- 618 bytes parent folder | download | duplicates (15)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
//@ check-pass
//@ revisions: current next
//@ ignore-compare-mode-next-solver (explicit revisions)
//@[next] compile-flags: -Znext-solver

// Verify that the unsize goal can cast a higher-ranked trait goal to
// a non-higer-ranked instantiation.

#![feature(unsize)]

use std::marker::Unsize;

fn test<T: ?Sized, U: ?Sized>()
where
    T: Unsize<U>,
{
}

fn main() {
    test::<dyn for<'a> Fn(&'a ()) -> &'a (), dyn Fn(&'static ()) -> &'static ()>();

    trait Foo<'a, 'b> {}
    test::<dyn for<'a, 'b> Foo<'a, 'b>, dyn for<'a> Foo<'a, 'a>>();

    trait Bar<'a> {}
    test::<dyn for<'a> Bar<'a>, dyn Bar<'_>>();
}