#ifndef STAN_LANG_AST_FUN_IS_MULTI_INDEX_HPP
#define STAN_LANG_AST_FUN_IS_MULTI_INDEX_HPP

#include <stan/lang/ast/node/idx.hpp>

namespace stan {
namespace lang {

/**
 * Return true if the specified index potentially takes more than
 * one value.
 *
 * @param idx index
 * @return true if index is not a unary index
 */
bool is_multi_index(const idx& idx);

}  // namespace lang
}  // namespace stan
#endif
