diff options
Diffstat (limited to 'src/libcore/ops/function.rs')
| -rw-r--r-- | src/libcore/ops/function.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libcore/ops/function.rs b/src/libcore/ops/function.rs index d1be724c326..3b356b9a1e7 100644 --- a/src/libcore/ops/function.rs +++ b/src/libcore/ops/function.rs @@ -72,6 +72,7 @@ label="expected an `Fn<{Args}>` closure, found `{Self}`", )] #[fundamental] // so that regex can rely that `&str: !FnMut` +#[must_use] pub trait Fn<Args> : FnMut<Args> { /// Performs the call operation. #[unstable(feature = "fn_traits", issue = "29625")] @@ -150,6 +151,7 @@ pub trait Fn<Args> : FnMut<Args> { label="expected an `FnMut<{Args}>` closure, found `{Self}`", )] #[fundamental] // so that regex can rely that `&str: !FnMut` +#[must_use] pub trait FnMut<Args> : FnOnce<Args> { /// Performs the call operation. #[unstable(feature = "fn_traits", issue = "29625")] @@ -228,6 +230,7 @@ pub trait FnMut<Args> : FnOnce<Args> { label="expected an `FnOnce<{Args}>` closure, found `{Self}`", )] #[fundamental] // so that regex can rely that `&str: !FnMut` +#[must_use] pub trait FnOnce<Args> { /// The returned type after the call operator is used. #[stable(feature = "fn_once_output", since = "1.12.0")] |