diff options
| -rw-r--r-- | src/libcore/ops.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libcore/ops.rs b/src/libcore/ops.rs index 372596cdd44..002c04f852a 100644 --- a/src/libcore/ops.rs +++ b/src/libcore/ops.rs @@ -895,6 +895,7 @@ shr_impl_all! { u8 u16 u32 u64 usize i8 i16 i32 i64 isize } /// } /// ``` #[lang="index"] +#[rustc_on_unimplemented = "the type `{Self}` cannot be indexed by `{Index}`"] #[stable] pub trait Index<Index: ?Sized> { type Output: ?Sized; @@ -933,6 +934,7 @@ pub trait Index<Index: ?Sized> { /// } /// ``` #[lang="index_mut"] +#[rustc_on_unimplemented = "the type `{Self}` cannot be mutably indexed by `{Index}`"] #[stable] pub trait IndexMut<Index: ?Sized> { type Output: ?Sized; |