fix: Deno.emit crashes with BorrowMutError (#12627)

Warn on await_holding_refcell_ref clippy rule to avoid this in the future.

Fixes #12453

1 files changed, 6 insertions, 3 deletions

diff --git a/core/runtime.rs b/core/runtime.rs
index 80221295d..704be7a76 100644
--- a/core/runtime.rs
+++ b/core/runtime.rs
@@ -2317,11 +2317,14 @@ assertEquals(1, notify_return_value);
       _: (),
       _: (),
     ) -> Result<(), AnyError> {
-      let op_state = op_state.borrow();
-      let inner_state = op_state.borrow::<InnerState>();
+      let n = {
+        let op_state = op_state.borrow();
+        let inner_state = op_state.borrow::<InnerState>();
+        inner_state.0
+      };
       // Future must be Poll::Pending on first call
       tokio::time::sleep(std::time::Duration::from_millis(1)).await;
-      if inner_state.0 != 42 {
+      if n != 42 {
         unreachable!();
       }
       Ok(())