mirror of https://github.com/rust-lang/rust
37 lines
691 B
Rust
37 lines
691 B
Rust
//@ build-fail
|
|
//@ revisions: normal mir-opt
|
|
//@ [mir-opt]compile-flags: -Zmir-opt-level=4
|
|
|
|
trait C {
|
|
const BOO: usize;
|
|
}
|
|
|
|
trait Foo<T> {
|
|
const BAR: usize;
|
|
}
|
|
|
|
struct A<T>(T);
|
|
|
|
impl<T: C> Foo<T> for A<T> {
|
|
const BAR: usize = [5, 6, 7][T::BOO]; //~ ERROR evaluation of `<A<()> as Foo<()>>::BAR` failed
|
|
}
|
|
|
|
fn foo<T: C>() -> &'static usize {
|
|
&<A<T> as Foo<T>>::BAR //~ constant
|
|
}
|
|
|
|
impl C for () {
|
|
const BOO: usize = 42;
|
|
}
|
|
|
|
impl C for u32 {
|
|
const BOO: usize = 1;
|
|
}
|
|
|
|
fn main() {
|
|
println!("{:x}", foo::<()>() as *const usize as usize);
|
|
println!("{:x}", foo::<u32>() as *const usize as usize);
|
|
println!("{:x}", foo::<()>());
|
|
println!("{:x}", foo::<u32>());
|
|
}
|