{"ast_node_type":"impl","tokens":[{"end":73,"kind":"keyword","start":0,"text":"hir::OpaqueTyOrigin::FnReturn"}]}
        hir::OpaqueTyOrigin::FnReturn { parent: owner, in_trait_or_impl }
        // Opaque types desugared from `impl Trait`.
        | hir::OpaqueTyOrigin::AsyncFn { parent: owner, in_trait_or_impl } => {