syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if self.tcx().features().generic_const_exprs() {
context_before:         let mut assume = predicate.trait_ref.args.const_at(2);
context_after:             assume = crate::traits::evaluate_const(self.infcx, assume, obligation.param_env)