{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"//"}]}
        // FIXME(#120456) - is `swap_remove` correct?
    pub fn steal_non_err(self, span: Span, key: StashKey) -> Option<Diag<'a, ()>> {
        let (diag, guar) = self.inner.borrow_mut().stashed_diagnostics.get_mut(&key).and_then(