syntax_data: {"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut result = self.evaluation_probe(|this| {
context_before:     ) -> Result<EvaluationResult, OverflowError> {
context_after:             match this.confirm_candidate(stack.obligation, candidate.clone()) {