File: associated-types-project-from-hrtb-in-trait-method.rs

package info (click to toggle)
rustc-web 1.85.0%2Bdfsg3-1~deb12u3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,759,988 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,056; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (38 lines) | stat: -rw-r--r-- 954 bytes parent folder | download | duplicates (7)
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
#![allow(dead_code)]
//@ run-rustfix
// Check projection of an associated type out of a higher-ranked trait-bound
// in the context of a method definition in a trait.

pub trait Foo<T> {
    type A;

    fn get(&self, t: T) -> Self::A;
}

trait SomeTrait<I : for<'x> Foo<&'x isize>> {
    fn some_method(&self, arg: I::A);
    //~^ ERROR cannot use the associated type of a trait with uninferred generic parameters
}

trait AnotherTrait<I : for<'x> Foo<&'x isize>> {
    fn some_method(&self, arg: <I as Foo<&isize>>::A);
}

trait YetAnotherTrait<I : for<'x> Foo<&'x isize>> {
    fn some_method<'a>(&self, arg: <I as Foo<&'a isize>>::A);
}

trait Banana<'a> {
    type Assoc: Default;
}

struct Peach<X>(std::marker::PhantomData<X>);

impl<X: for<'a> Banana<'a>> Peach<X> {
    fn mango(&self) -> X::Assoc {
    //~^ ERROR cannot use the associated type of a trait with uninferred generic parameters
        Default::default()
    }
}

pub fn main() {}