syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if !subty.has_escaping_bound_vars() {
context_before:     fn require_sized(&mut self, subty: Ty<'tcx>, cause: traits::ObligationCauseCode<'tcx>) {
context_after:             let cause = self.cause(cause);