{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":".flat_map(|cnum|"}]}
            .flat_map(|cnum| self.tcx.trait_impls_in_crate(cnum).iter())
            .chain(self.tcx.crates(()).iter().copied())
            .map(|impl_def_id| *impl_def_id)