Method has_result

common/expr.h:809–809

  ABSL_MUST_USE_RESULT std::unique_ptr<Expr> release_loop_step();

  ABSL_MUST_USE_RESULT bool has_result() const { return result_ != nullptr; }

  ABSL_MUST_USE_RESULT const Expr& result() const ABSL_ATTRIBUTE_LIFETIME_BOUND;