{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
        let err = self.inner.borrow_mut().stashed_diagnostics.get_mut(&key).and_then(
        // FIXME(#120456) - is `swap_remove` correct?
            |stashed_diagnostics| stashed_diagnostics.swap_remove(&span.with_parent(None)),