rust/tests/ui/generic-const-items/evaluatable-bounds.rs

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2023-07-10 01:10:03 +00:00
// This is a regression test for issue #104400.
//@ revisions: unconstrained constrained
//@[constrained] check-pass
// Test that we can constrain generic const items that appear inside associated consts by
// adding a (makeshift) "evaluatable"-bound to the item.
#![feature(generic_const_items, generic_const_exprs)]
#![allow(incomplete_features)]
trait Trait {
const LEN: usize;
#[cfg(unconstrained)]
const ARRAY: [i32; Self::LEN]; //[unconstrained]~ ERROR unconstrained generic constant
#[cfg(constrained)]
const ARRAY: [i32; Self::LEN]
where
[(); Self::LEN]:;
}
impl Trait for () {
const LEN: usize = 2;
const ARRAY: [i32; Self::LEN] = [360, 720];
}
fn main() {
let [_, _] = <() as Trait>::ARRAY;
}