src/java/org/jetbrains/plugins/clojure/psi/ClojureBaseElementImpl.java [29:62]:
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    return element == null ||
        (element instanceof LeafPsiElement || element instanceof PsiWhiteSpace || element instanceof PsiComment);
  }

  public PsiElement getFirstNonLeafElement() {
    PsiElement first = getFirstChild();
    while (first != null && isWrongElement(first)) {
      first = first.getNextSibling();
    }
    return first;
  }

  public PsiElement getNonLeafElement(int k) {
    final List<PsiElement> elements = ContainerUtil.filter(getChildren(), new Condition<PsiElement>() {
      public boolean value(PsiElement psiElement) {
        return !isWrongElement(psiElement);
      }
    });
    if (k - 1 >= elements.size()) return  null;
    return elements.get(k-1);
  }

  public PsiElement getLastNonLeafElement() {
    PsiElement lastChild = getLastChild();
    while (lastChild != null && isWrongElement(lastChild)) {
      lastChild = lastChild.getPrevSibling();
    }
    return lastChild;
  }

  public <T> T findFirstChildByClass(Class<T> aClass) {
    PsiElement element = getFirstChild();
    while (element != null && !aClass.isInstance(element)) {
      element = element.getNextSibling();
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src/java/org/jetbrains/plugins/clojure/psi/impl/ClojureFileImpl.java [158:191]:
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    return element == null ||
        (element instanceof LeafPsiElement || element instanceof PsiWhiteSpace || element instanceof PsiComment);
  }

  public PsiElement getFirstNonLeafElement() {
    PsiElement first = getFirstChild();
    while (first != null && isWrongElement(first)) {
      first = first.getNextSibling();
    }
    return first;
  }

  public PsiElement getNonLeafElement(int k) {
    final List<PsiElement> elements = ContainerUtil.filter(getChildren(), new Condition<PsiElement>() {
      public boolean value(PsiElement psiElement) {
        return !isWrongElement(psiElement);
      }
    });
    if (k - 1 >= elements.size()) return  null;
    return elements.get(k-1);
  }

  public PsiElement getLastNonLeafElement() {
    PsiElement lastChild = getLastChild();
    while (lastChild != null && isWrongElement(lastChild)) {
      lastChild = lastChild.getPrevSibling();
    }
    return lastChild;
  }

  public <T> T findFirstChildByClass(Class<T> aClass) {
    PsiElement element = getFirstChild();
    while (element != null && !aClass.isInstance(element)) {
      element = element.getNextSibling();
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