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Drop the expander borrow in all control flow paths #13154

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Merged
bors merged 1 commit into from
Aug 31, 2022
Merged

Drop the expander borrow in all control flow paths #13154

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10 changes: 9 additions & 1 deletion crates/hir-ty/src/lower.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -332,7 +332,10 @@ impl<'a> TyLoweringContext<'a> {
TypeRef::Macro(macro_call) => {
let (mut expander, recursion_start) = {
match RefMut::filter_map(self.expander.borrow_mut(), Option::as_mut) {
// There already is an expander here, this means we are already recursing
Ok(expander) => (expander, false),
// No expander was created yet, so we are at the start of the expansion recursion
// and therefore have to create an expander.
Err(expander) => (
RefMut::map(expander, |it| {
it.insert(Expander::new(
Expand Down Expand Up @@ -362,9 +365,14 @@ impl<'a> TyLoweringContext<'a> {
.exit(self.db.upcast(), mark);
Some(ty)
}
_ => None,
_ => {
drop(expander);
None
}
}
};

// drop the expander, resetting it to pre-recursion state
if recursion_start {
*self.expander.borrow_mut() = None;
}
Expand Down