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// Test if the on_unimplemented message override works
#![feature(rustc_attrs)]
struct Foo<T>(T);
struct Bar<T>(T);
#[rustc_on_unimplemented = "trait message"]
trait Index<Idx: ?Sized> {
type Output: ?Sized;
fn index(&self, index: Idx) -> &Self::Output;
}
#[rustc_on_unimplemented = "on impl for Foo"]
impl Index<Foo<usize>> for [i32] {
type Output = i32;
fn index(&self, _index: Foo<usize>) -> &i32 {
loop {}
}
}
#[rustc_on_unimplemented = "on impl for Bar"]
impl Index<Bar<usize>> for [i32] {
type Output = i32;
fn index(&self, _index: Bar<usize>) -> &i32 {
loop {}
}
}
fn main() {
Index::index(&[] as &[i32], 2u32);
//~^ ERROR E0277
//~| ERROR E0277
//~| ERROR E0277
Index::index(&[] as &[i32], Foo(2u32));
//~^ ERROR E0277
//~| ERROR E0277
//~| ERROR E0277
Index::index(&[] as &[i32], Bar(2u32));
//~^ ERROR E0277
//~| ERROR E0277
//~| ERROR E0277
}
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