{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":".filter(|self_ty|"}]}
                .filter(|self_ty| !self_ty.has_non_region_param())
                // We don't care about blanket impls.
                .map(|self_ty| tcx.erase_regions(self_ty).to_string())