Method error

java/dagger/internal/codegen/BuilderValidator.java:209–220

(
      ValidationReport.Builder<TypeElement> builder,
      ExecutableElement method,
      String enclosedError,
      String inheritedError,
      Object... extraArgs)

   * class was included in this compile run.  But that's hard, and this is close enough.
   */
  private static void error(
      ValidationReport.Builder<TypeElement> builder,
      ExecutableElement method,
      String enclosedError,
      String inheritedError,
      Object... extraArgs) {
    if (method.getEnclosingElement().equals(builder.getSubject())) {
      builder.addError(String.format(enclosedError, extraArgs), method);
    } else {
      builder.addError(String.format(inheritedError, append(extraArgs, method)));
    }
  }

  private static Object[] append(Object[] initial, Object additional) {
    Object[] newArray = Arrays.copyOf(initial, initial.length + 1);