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Rollup merge of rust-lang#77055 - est31:more_track_caller, r=Mark-Sim…
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…ulacrum

Add #[track_caller] to more panicking Cell functions

Continuation of rust-lang#74526

Adds the #[track_caller] attribute to almost all panicking Cell
functions. The ones that borrow two Cells in their function
body are spared, because the panic location helps pinpoint
which of the two borrows failed. You'd need to have
full debuginfo and backtraces enabled together with column
info in order to be able to discern the cases.
Column info in debuginfo is only available on non-Windows platforms.
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Dylan-DPC committed Sep 23, 2020
2 parents f8dec3d + 05c3a2b commit c3c03f2
Showing 1 changed file with 3 additions and 0 deletions.
3 changes: 3 additions & 0 deletions library/core/src/cell.rs
Original file line number Diff line number Diff line change
Expand Up @@ -697,6 +697,7 @@ impl<T> RefCell<T> {
/// ```
#[inline]
#[stable(feature = "refcell_replace", since = "1.24.0")]
#[track_caller]
pub fn replace(&self, t: T) -> T {
mem::replace(&mut *self.borrow_mut(), t)
}
Expand All @@ -719,6 +720,7 @@ impl<T> RefCell<T> {
/// ```
#[inline]
#[stable(feature = "refcell_replace_swap", since = "1.35.0")]
#[track_caller]
pub fn replace_with<F: FnOnce(&mut T) -> T>(&self, f: F) -> T {
let mut_borrow = &mut *self.borrow_mut();
let replacement = f(mut_borrow);
Expand Down Expand Up @@ -1052,6 +1054,7 @@ impl<T: Clone> Clone for RefCell<T> {
///
/// Panics if the value is currently mutably borrowed.
#[inline]
#[track_caller]
fn clone(&self) -> RefCell<T> {
RefCell::new(self.borrow().clone())
}
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