mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 01:04:03 +00:00
a9841936fe
Change the implicit `Sized` `Obligation` `Span` for call expressions to include the whole expression. This aids the existing deduplication machinery to reduce the number of errors caused by a single unsized expression.
26 lines
535 B
Rust
26 lines
535 B
Rust
// Test if the on_unimplemented message override works
|
|
|
|
#![feature(rustc_attrs)]
|
|
|
|
|
|
#[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::<u32>::index(&[1, 2, 3] as &[i32], 2u32);
|
|
//~^ ERROR E0277
|
|
//~| ERROR E0277
|
|
}
|