syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()),"}]}
source_snippet:                 TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()),
context_before:             let mut result = this.evaluate_predicate_recursively(
context_after:                 obligation.clone(),