{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"impl_.of_trait.as_ref().map(|ast_trait_ref|"}]}
    impl_.of_trait.as_ref().map(|ast_trait_ref| {
    let impl_ = item.expect_impl();
        let selfty = tcx.type_of(def_id).instantiate_identity();