31 lines
775 B
Rust
31 lines
775 B
Rust
//@ build-fail
|
|
//@ compile-flags: -Zunleash-the-miri-inside-of-you
|
|
|
|
// a test demonstrating why we do need to run static const qualification on associated constants
|
|
// instead of just checking the final constant
|
|
|
|
trait Foo<T> {
|
|
const X: T;
|
|
}
|
|
|
|
trait Bar<T, U: Foo<T>> {
|
|
const F: u32 = (U::X, 42).1;
|
|
}
|
|
|
|
impl Foo<u32> for () {
|
|
const X: u32 = 42;
|
|
}
|
|
impl Foo<Vec<u32>> for String {
|
|
const X: Vec<u32> = Vec::new();
|
|
}
|
|
|
|
impl Bar<u32, ()> for () {}
|
|
impl Bar<Vec<u32>, String> for String {}
|
|
|
|
fn main() {
|
|
// this is fine, but would have been forbidden by the static checks on `F`
|
|
let x = <() as Bar<u32, ()>>::F;
|
|
// this test only causes errors due to the line below, so post-monomorphization
|
|
let y = <String as Bar<Vec<u32>, String>>::F; //~ constant
|
|
}
|