{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"debug_assert_eq!(adt_def.variants().len(),"}]}
            debug_assert_eq!(adt_def.variants().len(), 1);
            // For non-enum, there is only one variant, and its def_id is the adt's.
            debug_assert_eq!(adt_def.non_enum_variant().def_id, def_id);