syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let result_tup = Ty::new_tup(self.tcx, &[ty, bool_ty]);
context_before:             BinOp::Add | BinOp::Sub | BinOp::Mul if self.check_overflow && ty.is_integral() => {
context_after:                 let result_value = self.temp(result_tup, span);