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Add track_caller to .steal() #81125

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Jan 18, 2021
Merged

Add track_caller to .steal() #81125

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4 changes: 3 additions & 1 deletion compiler/rustc_data_structures/src/steal.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,17 +30,19 @@ impl<T> Steal<T> {
Steal { value: RwLock::new(Some(value)) }
}

#[track_caller]
pub fn borrow(&self) -> MappedReadGuard<'_, T> {
ReadGuard::map(self.value.borrow(), |opt| match *opt {
None => panic!("attempted to read from stolen value"),
Comment on lines +33 to 36
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This PR only fixed .steal(), .borrow() has no effect because the panic! is in a closure.

Some(ref v) => v,
})
}

#[track_caller]
pub fn steal(&self) -> T {
let value_ref = &mut *self.value.try_write().expect("stealing value which is locked");
let value = value_ref.take();
value.expect("attempt to read from stolen value")
value.expect("attempt to steal from stolen value")
}
}

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