diff options
Diffstat (limited to 'src/libcore')
| -rw-r--r-- | src/libcore/ops/try.rs | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/libcore/ops/try.rs b/src/libcore/ops/try.rs index 4f4652084a8..a748ee87ef9 100644 --- a/src/libcore/ops/try.rs +++ b/src/libcore/ops/try.rs @@ -5,19 +5,20 @@ /// extracting those success or failure values from an existing instance and /// creating a new instance from a success or failure value. #[unstable(feature = "try_trait", issue = "42327")] -#[rustc_on_unimplemented( +#[cfg_attr(not(bootstrap), rustc_on_unimplemented( on(all( any(from_method="from_error", from_method="from_ok"), from_desugaring="QuestionMark"), message="the `?` operator can only be used in {ItemContext} \ that returns `Result` or `Option` \ (or another type that implements `{Try}`)", -label="cannot use the `?` operator in {ItemContext} that returns `{Self}`"), +label="cannot use the `?` operator in {ItemContext} that returns `{Self}`", +enclosing_scope="this function should return `Result` or `Option` to accept `?`"), on(all(from_method="into_result", from_desugaring="QuestionMark"), message="the `?` operator can only be applied to values \ that implement `{Try}`", label="the `?` operator cannot be applied to type `{Self}`") -)] +))] #[doc(alias = "?")] pub trait Try { /// The type of this value when viewed as successful. |