{"ast_node_type":"impl","tokens":[{"end":85,"kind":"keyword","start":0,"text":"hir::OpaqueTyOrigin::FnReturn"}]}
                hir::OpaqueTyOrigin::FnReturn { parent: fn_def_id, in_trait_or_impl }
            origin:
                | hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, in_trait_or_impl },