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Add #[must_use] to conversions that move self

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This commit is contained in:
John Kugelman
2021-10-10 19:50:52 -04:00
parent 6928fafe06
commit b115781bcd
19 changed files with 54 additions and 11 deletions
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5
library/core/src/pin.rs
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@@ -715,6 +715,7 @@ impl<'a, T: ?Sized> Pin<&'a T> {
impl<'a, T: ?Sized> Pin<&'a mut T> {
/// Converts this `Pin<&mut T>` into a `Pin<&T>` with the same lifetime.
#[inline(always)]
#[must_use = "`self` will be dropped if the result is not used"]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[stable(feature = "pin", since = "1.33.0")]
pub const fn into_ref(self) -> Pin<&'a T> {
@@ -731,6 +732,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
/// the `Pin` itself. This method allows turning the `Pin` into a reference
/// with the same lifetime as the original `Pin`.
#[inline(always)]
#[must_use = "`self` will be dropped if the result is not used"]
#[stable(feature = "pin", since = "1.33.0")]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
pub const fn get_mut(self) -> &'a mut T
@@ -751,6 +753,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
/// If the underlying data is `Unpin`, `Pin::get_mut` should be used
/// instead.
#[inline(always)]
#[must_use = "`self` will be dropped if the result is not used"]
#[stable(feature = "pin", since = "1.33.0")]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
pub const unsafe fn get_unchecked_mut(self) -> &'a mut T {
@@ -772,6 +775,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
/// not move out of the argument you receive to the interior function.
///
/// [`pin` module]: self#projections-and-structural-pinning
#[must_use = "`self` will be dropped if the result is not used"]
#[stable(feature = "pin", since = "1.33.0")]
pub unsafe fn map_unchecked_mut<U, F>(self, func: F) -> Pin<&'a mut U>
where
@@ -811,6 +815,7 @@ impl<'a, P: DerefMut> Pin<&'a mut Pin<P>> {
/// implementations of `P::DerefMut` are likewise ruled out by the contract of
/// `Pin::new_unchecked`.
#[unstable(feature = "pin_deref_mut", issue = "86918")]
#[must_use = "`self` will be dropped if the result is not used"]
#[inline(always)]
pub fn as_deref_mut(self) -> Pin<&'a mut P::Target> {
// SAFETY: What we're asserting here is that going from