syntax_data: {"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let placeholder_obligation =
context_before:     ) -> Result<Normalized<'tcx, GenericArgsRef<'tcx>>, ()> {
context_after:             self.infcx.enter_forall_and_leak_universe(obligation.predicate);