@NotNull
  public GrExpression getArgument(@NotNull GrMethodCall callExpression, int index) {
    GrExpression[] expressionArguments = callExpression.getExpressionArguments();
    if (index < expressionArguments.length) {
      return expressionArguments[index];
    }

    return callExpression.getClosureArguments()[index - expressionArguments.length];
  }
@NotNull
  public GrExpression getArgument(@NotNull GrMethodCall callExpression, int index)