bjoernager/rust
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Auto merge of #74526 - erikdesjardins:reftrack, r=Mark-Simulacrum

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Add track_caller to RefCell::{borrow, borrow_mut}

So panic messages point at the offending borrow.

Fixes #74472
This commit is contained in:
bors 2020-08-03 21:43:27 +00:00
commit d8cbd9caca
2 changed files with 10 additions and 1 deletions
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2
library/core/src/cell.rs
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@ -788,6 +788,7 @@ impl<T: ?Sized> RefCell<T> {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
#[track_caller]
pub fn borrow(&self) -> Ref<'_, T> {
self.try_borrow().expect("already mutably borrowed")
}
@ -863,6 +864,7 @@ impl<T: ?Sized> RefCell<T> {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
#[track_caller]
pub fn borrow_mut(&self) -> RefMut<'_, T> {
self.try_borrow_mut().expect("already borrowed")
}