{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":".map(|it|"}]}
                    .map(|it| self.lower_type_ref(it, impl_trait_lower_fn))
                    .and_then(|rt| rt.ty())
                    .unwrap_or_else(|| self.alloc_type_ref_desugared(TypeRef::unit()));