resharper/resharper-yaml/src/Yaml/Psi/Tree/Impl/ChameleonDocumentBody.cs [218:252]:
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      AssertTextLength(openedChameleon);

      DeleteChildRange(firstChild, lastChild);
      OpenChameleonFrom(openedChameleon);
    }

    private void OpenChameleonFrom([NotNull] ITreeNode openedChameleon)
    {
      Assertion.Assert(firstChild == null && lastChild == null, "firstChild == null && lastChild == null");

      ITreeNode child;
      while ((child = openedChameleon.FirstChild) != null)
      {
        ((CompositeElement) openedChameleon).DeleteChildRange(child, child);
        AppendNewChild((TreeElement) child);
      }

      myOpened = true;
    }

    [Conditional("JET_MODE_ASSERT")]
    private void AssertSingleChild()
    {
      if (firstChild == lastChild && firstChild is IClosedChameleonBody)
        return;
      Assertion.Fail("One ChameleonElement child but found also {0}", lastChild.NodeType);
    }

    [Conditional("JET_MODE_ASSERT")]
    private void AssertTextLength(ITreeNode openedChameleon)
    {
      var expectedTextLength = firstChild.GetTextLength();
      var actualTextLength = openedChameleon.GetTextLength();
      Assertion.Assert(expectedTextLength == actualTextLength, "Chameleon length differ after opening! {0} {1}",
        expectedTextLength, actualTextLength);
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resharper/resharper-yaml/src/Yaml/Psi/Tree/Impl/ChameleonMapValueNode.cs [140:174]:
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      AssertTextLength(openedChameleon);

      DeleteChildRange(firstChild, lastChild);
      OpenChameleonFrom(openedChameleon);
    }

    private void OpenChameleonFrom([NotNull] ITreeNode openedChameleon)
    {
      Assertion.Assert(firstChild == null && lastChild == null, "firstChild == null && lastChild == null");

      ITreeNode child;
      while ((child = openedChameleon.FirstChild) != null)
      {
        ((CompositeElement) openedChameleon).DeleteChildRange(child, child);
        AppendNewChild((TreeElement) child);
      }

      myOpened = true;
    }

    [Conditional("JET_MODE_ASSERT")]
    private void AssertSingleChild()
    {
      if (firstChild == lastChild && firstChild is IClosedChameleonBody)
        return;
      Assertion.Fail("One ChameleonElement child but found also {0}", lastChild.NodeType);
    }

    [Conditional("JET_MODE_ASSERT")]
    private void AssertTextLength(ITreeNode openedChameleon)
    {
      var expectedTextLength = firstChild.GetTextLength();
      var actualTextLength = openedChameleon.GetTextLength();
      Assertion.Assert(expectedTextLength == actualTextLength, "Chameleon length differ after opening! {0} {1}",
        expectedTextLength, actualTextLength);
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