{"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);
                        // Rule 5, we'll need to check that here.
                        // NB: For RFC 3627's Rule 3, we limit the default binding mode's ref