mirror of https://github.com/rust-lang/rust
43 lines
752 B
Rust
43 lines
752 B
Rust
//@ build-pass
|
|
|
|
#![allow(incomplete_features)]
|
|
#![feature(generic_const_exprs)]
|
|
|
|
trait TraitOne {
|
|
const MY_NUM: usize;
|
|
type MyErr: std::fmt::Debug;
|
|
|
|
fn do_one_stuff(arr: [u8; Self::MY_NUM]) -> Result<(), Self::MyErr>;
|
|
}
|
|
|
|
trait TraitTwo {
|
|
fn do_two_stuff();
|
|
}
|
|
|
|
impl<O: TraitOne> TraitTwo for O
|
|
where
|
|
[(); Self::MY_NUM]:,
|
|
{
|
|
fn do_two_stuff() {
|
|
O::do_one_stuff([5; Self::MY_NUM]).unwrap()
|
|
}
|
|
}
|
|
|
|
struct Blargotron;
|
|
|
|
#[derive(Debug)]
|
|
struct ErrTy<const N: usize>([(); N]);
|
|
|
|
impl TraitOne for Blargotron {
|
|
const MY_NUM: usize = 3;
|
|
type MyErr = ErrTy<{ Self::MY_NUM }>;
|
|
|
|
fn do_one_stuff(_arr: [u8; Self::MY_NUM]) -> Result<(), Self::MyErr> {
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
Blargotron::do_two_stuff();
|
|
}
|