884af362f2
Previously, any associated function could have `~const` trait bounds on generic parameters, which could lead to ICEs when these bounds were used on associated functions of non-`#[const_trait] trait` or non-`impl const` blocks. Includes changes as per @fee1-dead's comments in #116210.
38 lines
769 B
Rust
38 lines
769 B
Rust
#![feature(const_trait_impl, effects)]
|
|
#![feature(generic_arg_infer)]
|
|
#![feature(generic_const_exprs)]
|
|
#![allow(incomplete_features)]
|
|
|
|
struct Foo<const N: usize>;
|
|
|
|
impl<const N: usize> Foo<N> {
|
|
fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
|
|
//~^ ERROR `~const` is not allowed here
|
|
//~| ERROR mismatched types
|
|
Foo
|
|
}
|
|
}
|
|
|
|
#[const_trait]
|
|
trait Add42 {
|
|
fn add(a: usize) -> usize;
|
|
}
|
|
|
|
impl const Add42 for () {
|
|
fn add(a: usize) -> usize {
|
|
a + 42
|
|
}
|
|
}
|
|
|
|
fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
|
|
//~^ ERROR `~const` is not allowed here
|
|
//~| ERROR mismatched types
|
|
Foo
|
|
}
|
|
|
|
fn main() {
|
|
let foo = Foo::<0>;
|
|
let foo = bar::<(), _>(foo);
|
|
let _foo = bar::<(), _>(foo);
|
|
}
|