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-rw-r--r--dhall/src/normalize.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/dhall/src/normalize.rs b/dhall/src/normalize.rs
index 26b23c2..17996cf 100644
--- a/dhall/src/normalize.rs
+++ b/dhall/src/normalize.rs
@@ -954,11 +954,15 @@ mod thunk {
self.clone()
}
+ // WARNING: avoid normalizing any thunk while holding on to this ref
+ // or you will run into BorrowMut panics
pub(crate) fn normalize_whnf(&self) -> Ref<Value> {
self.0.borrow_mut().normalize_whnf();
Ref::map(self.0.borrow(), ThunkInternal::as_whnf)
}
+ // WARNING: avoid normalizing any thunk while holding on to this ref
+ // or you will run into BorrowMut panics
pub(crate) fn normalize_nf(&self) -> Ref<Value> {
self.0.borrow_mut().normalize_nf();
Ref::map(self.0.borrow(), ThunkInternal::as_nf)