syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()),"}]}
source_snippet:                     TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()),
context_before:                 self.evaluate_predicates_recursively(
context_after:                     nested_obligations.into_iter().chain(obligations),