private PsiComment findPsiCommentChild(PsiFile aFile) {
    PsiComment comment = PsiTreeUtil.findChildOfType(aFile, PsiComment.class);
    if (comment == null) {
      throw new IncorrectOperationException("Incorrect comment \"" + aFile.getText() + "\".");
    }

    DummyHolderFactory.createHolder(myManager, (TreeElement)SourceTreeToPsiMap.psiElementToTree(comment), null);
    return comment;
  }
private PsiComment findPsiCommentChild(PsiFile aFile)