{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"projection_bounds.insert(key,"}]}
                projection_bounds.insert(key, (proj, proj_span))
            if let Some((old_proj, old_proj_span)) =
                && tcx.anonymize_bound_vars(proj) != tcx.anonymize_bound_vars(old_proj)