{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":")"}]}
    ) -> Result<Candidate<I>, NoSolution> {
        f: impl FnOnce(&mut EvalCtxt<'_, D>) -> QueryResult<I>,
        self.cx.enter(|ecx| f(ecx)).map(|result| Candidate { source: self.source, result })