Currently the following code in RenderBlockFlow.cpp: ``` for (auto& block : descendantsOfType<RenderBlock>(*this)) ... ``` Will lead to the following compile-time error: ``` ./rendering/RenderIterator.h:131:12: error: no matching function for call to 'nextAncestorSibling' return nextAncestorSibling(current, stayWithin); ``` It was mentioned this is due to a "constness issue; const_cast makes it work. We should teach the descendant iterator to work with const objects. childrenOfType works fine so it should be relatively easy."
<rdar://problem/86787920>