Rollup merge of rust-lang#60850 - SimonSapin:unguarded, r=alexcrichton

Stabilize RefCell::try_borrow_unguarded Servo has been using this since servo/servo#23196 to add a runtime check to some unsafe code, as discussed in PR rust-lang#59211. Stabilizing would help do more of the same in libraries that also have users on Stable.
Centril · May 30, 2019 · e707533 · e707533
2 parents 1529ea6 + 9fd4d48
commit e707533
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diff --git a/src/doc/unstable-book/src/library-features/borrow-state.md b/src/doc/unstable-book/src/library-features/borrow-state.md
diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
@@ -967,7 +967,6 @@ impl<T: ?Sized> RefCell<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(borrow_state)]
     /// use std::cell::RefCell;
     ///
     /// let c = RefCell::new(5);
@@ -982,7 +981,7 @@ 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()) {