{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
                let res = self.context.new_call(None, builtin, &[a]);
                let builtin = self.context.get_builtin_function("__builtin_constant_p");
                self.icmp(IntPredicate::IntEQ, res, self.const_i32(0))