{"ast_node_type":"impl","tokens":[{"end":90,"kind":"keyword","start":0,"text":"hir::OpaqueTyOrigin::FnReturn"}]}
            hir::OpaqueTyOrigin::FnReturn { parent: parent.to_def_id(), in_trait_or_impl }
        hir::OpaqueTyOrigin::FnReturn { parent, in_trait_or_impl } => {
        }