mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 00:03:43 +00:00
28 lines
730 B
Rust
28 lines
730 B
Rust
// We should not see the unused_attributes lint fire for
|
|
// rustc_on_unimplemented, but with this bug we are seeing it fire (on
|
|
// subsequent runs) if incremental compilation is enabled.
|
|
|
|
// revisions: cfail1 cfail2
|
|
// build-pass (FIXME(62277): could be check-pass?)
|
|
|
|
#![feature(rustc_attrs)]
|
|
#![deny(unused_attributes)]
|
|
|
|
#[rustc_on_unimplemented = "invalid"]
|
|
trait Index<Idx: ?Sized> {
|
|
type Output: ?Sized;
|
|
fn index(&self, index: Idx) -> &Self::Output;
|
|
}
|
|
|
|
#[rustc_on_unimplemented = "a usize is required to index into a slice"]
|
|
impl Index<usize> for [i32] {
|
|
type Output = i32;
|
|
fn index(&self, index: usize) -> &i32 {
|
|
&self[index]
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
Index::<usize>::index(&[1, 2, 3] as &[i32], 2);
|
|
}
|