syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"ty::PredicateKind::Clause(ty::ClauseKind::UnstableFeature(symbol))"}]}
source_snippet:                 ty::PredicateKind::Clause(ty::ClauseKind::UnstableFeature(symbol)) => {
context_after:                     if may_use_unstable_feature(self.infcx, obligation.param_env, symbol) {