{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"debug_assert!(ref_pat_matches_mut_ref);"}]}
                        debug_assert!(ref_pat_matches_mut_ref);
                        // but not Rule 5, we'll need to check that here.
                        self.error_inherited_ref_mutability_mismatch(pat, pat_prefix_span);