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Stabilize RefCell::try_borrow_unguarded 

Servo has been using this since https://github.com/servo/servo/pull/23196 to add a runtime check to some unsafe code, as discussed in PR https://github.com/rust-lang/rust/pull/59211. Stabilizing would help do more of the same in libraries that also have users on Stable.
This commit is contained in:
Simon Sapin 2019-05-15 11:54:16 +02:00
parent c84a7abf8b
commit 9fd4d48b5e
2 changed files with 1 additions and 9 deletions
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7
src/doc/unstable-book/src/library-features/borrow-state.md
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@ -1,7 +0,0 @@
# `borrow_state`
The tracking issue for this feature is: [#27733]
[#27733]: https://github.com/rust-lang/rust/issues/27733
------------------------

3
src/libcore/cell.rs
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@ -969,7 +969,6 @@ impl<T: ?Sized> RefCell<T> {
/// # Examples
///
/// ```
/// #![feature(borrow_state)]
/// use std::cell::RefCell;
///
/// let c = RefCell::new(5);
@ -984,7 +983,7 @@ impl<T: ?Sized> RefCell<T> {
/// assert!(unsafe { c.try_borrow_unguarded() }.is_ok());
/// }
/// ```
#[unstable(feature = "borrow_state", issue = "27733")]
#[stable(feature = "borrow_state", since = "1.37.0")]
#[inline]
pub unsafe fn try_borrow_unguarded(&self) -> Result<&T, BorrowError> {
if !is_writing(self.borrow.get()) {