syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Option<CacheData<'a, X>> {
context_before:         mut candidate_is_applicable: impl FnMut(&NestedGoals<X>) -> bool,
context_after:         let entry = self.map.get(&input)?;