protected override void removeChildRenderObject(RenderObject child)
{
_RenderLayoutBuilder renderObject = this.renderObject;
D.assert(renderObject.child == child);
renderObject.child = null;
D.assert(renderObject == this.renderObject);
}
protected override void insertChildRenderObject(RenderObject child, object slot)
{
_RenderLayoutBuilder renderObject = this.renderObject;
D.assert(slot == null);
D.assert(renderObject.debugValidateChild(child));
renderObject.child = (RenderBox)child;
D.assert(renderObject == this.renderObject);
}