{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"//"}]}
        // that candidate. This means that for `impl<F: FnOnce(u32)> Trait<F> for () {}`
        // If there's a unique way to prove a given goal, recurse into
        // and a `(): Trait<?0>` goal we recurse into the impl and look at