{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"LockstepIterSize::Constraint(r_len,"}]}
                LockstepIterSize::Constraint(r_len, _) if l_len == r_len => self,
                LockstepIterSize::Contradiction(_) => other,
                LockstepIterSize::Constraint(r_len, r_id) => {