diff options
Diffstat (limited to 'src/libcore/ops/function.rs')
| -rw-r--r-- | src/libcore/ops/function.rs | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/libcore/ops/function.rs b/src/libcore/ops/function.rs index c9591c3f57b..3b356b9a1e7 100644 --- a/src/libcore/ops/function.rs +++ b/src/libcore/ops/function.rs @@ -26,7 +26,7 @@ /// is expected. /// /// Use `Fn` as a bound when you want to accept a parameter of function-like -/// type and need to call it repeatedly and without mutating state (e.g. when +/// type and need to call it repeatedly and without mutating state (e.g., when /// calling it concurrently). If you do not need such strict requirements, use /// [`FnMut`] or [`FnOnce`] as bounds. /// @@ -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")] @@ -84,7 +85,7 @@ pub trait Fn<Args> : FnMut<Args> { /// /// `FnMut` is implemented automatically by closures which take mutable /// references to captured variables, as well as all types that implement -/// [`Fn`], e.g. (safe) [function pointers][] (since `FnMut` is a supertrait of +/// [`Fn`], e.g., (safe) [function pointers][] (since `FnMut` is a supertrait of /// [`Fn`]). Additionally, for any type `F` that implements `FnMut`, `&mut F` /// implements `FnMut`, too. /// @@ -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")] @@ -163,7 +165,7 @@ pub trait FnMut<Args> : FnOnce<Args> { /// implements `FnOnce`, it can only be called once. /// /// `FnOnce` is implemented automatically by closure that might consume captured -/// variables, as well as all types that implement [`FnMut`], e.g. (safe) +/// variables, as well as all types that implement [`FnMut`], e.g., (safe) /// [function pointers][] (since `FnOnce` is a supertrait of [`FnMut`]). /// /// Since both [`Fn`] and [`FnMut`] are subtraits of `FnOnce`, any instance of @@ -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")] |