{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"///"}]}
    /// lowering of `async Fn()` bounds to desugar to another trait like `LendingFn`.
    /// that is generic over `async`ness, if that's ever possible, or modify the
    fn map_trait_to_async_trait(&self, def_id: DefId) -> Option<DefId> {