{"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"|bound|"}]}
            |bound| match *bound {
        tcx.hir_node_by_def_id(impl_opaque_def_id).expect_opaque_ty().bounds.iter().find_map(
                rustc_hir::GenericBound::Use(_, span) => Some(span),