syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"ensure_sufficient_stack(||"}]}
source_snippet:         ensure_sufficient_stack(|| {
context_before:     ) -> Result<PredicateObligations<'tcx>, SelectionError<'tcx>> {
context_after:             assert_eq!(obligation.predicate.polarity(), ty::PredicatePolarity::Positive);