code: func (function *SNativeFunctionDescription) Signature() string {
  	argTypeNames := make([]string, len(function.Abi.Inputs))
  	for i, arg := range function.Abi.Inputs {
  		argTypeNames[i] = arg.EVM.GetSignature()
  	}
  	return fmt.Sprintf("%s(%s)", function.Name,
  		strings.Join(argTypeNames, ","))
  }
docs: //
  // SNative functions
  //
  // Get function signature