Rollup merge of rust-lang#92427 - ChayimFriedman2:patch-1, r=kennytm

matthiaskrgr · web-flow · commit c10fe04484e9 · 2021-12-30T13:12:36.000+01:00
Use `UnsafeCell::get_mut()` in `core::lazy::OnceCell::get_mut()`

This removes one unnecessary `unsafe` block.
diff --git a/library/core/src/lazy.rs b/library/core/src/lazy.rs
@@ -102,8 +102,7 @@ impl<T> OnceCell<T> {
     /// Returns `None` if the cell is empty.
     #[unstable(feature = "once_cell", issue = "74465")]
     pub fn get_mut(&mut self) -> Option<&mut T> {
-        // SAFETY: Safe because we have unique access
-        unsafe { &mut *self.inner.get() }.as_mut()
+        self.inner.get_mut().as_mut()
     }
 
     /// Sets the contents of the cell to `value`.

Original file line number	Diff line number	Diff line change
`@@ -102,8 +102,7 @@ impl<T> OnceCell<T> {`
`102`	`102`	/// Returns `None` if the cell is empty.
`103`	`103`	`#[unstable(feature = "once_cell", issue = "74465")]`
`104`	`104`	`pub fn get_mut(&mut self) -> Option<&mut T> {`
`105`		`- // SAFETY: Safe because we have unique access`
`106`		`- unsafe { &mut *self.inner.get() }.as_mut()`
	`105`	`+ self.inner.get_mut().as_mut()`
`107`	`106`	`}`
`108`	`107`
`109`	`108`	/// Sets the contents of the cell to `value`.