syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"TraitObligationStackList"}]}
source_snippet:         TraitObligationStackList { cache, head: None }
context_before:     fn empty(cache: &'o ProvisionalEvaluationCache<'tcx>) -> TraitObligationStackList<'o, 'tcx> {
context_after:     }