File: dispatch-on-self-type-1.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, forky, 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 (39 lines) | stat: -rw-r--r-- 809 bytes parent folder | download | duplicates (6)
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
28
29
30
31
32
33
34
35
36
37
38
39
//@ check-pass

#![feature(inherent_associated_types, auto_traits, negative_impls)]
#![allow(incomplete_features)]

use std::cmp::Ordering;

// Check that inherent associated types are dispatched on the concrete Self type.

struct Select<T, U>(T, U);

impl<T: Ordinary, U: Ordinary> Select<T, U> {
    type Type = ();
}

impl<T: Ordinary> Select<T, Special> {
    type Type = bool;
}

impl<T: Ordinary> Select<Special, T> {
    type Type = Ordering;
}

impl Select<Special, Special> {
    type Type = (bool, bool);
}

fn main() {
    let _: Select<String, Special>::Type = false;
    let _: Select<Special, Special>::Type = (true, false);
    let _: Select<Special, u8>::Type = Ordering::Equal;
    let _: Select<i128, ()>::Type = ();
}

enum Special {}

impl !Ordinary for Special {}

auto trait Ordinary {}