Index: libcxx/include/__tree
===================================================================
--- libcxx/include/__tree
+++ libcxx/include/__tree
@@ -376,7 +376,8 @@
 {
     _LIBCPP_ASSERT_UNCATEGORIZED(__root != nullptr, "Root node should not be null");
     _LIBCPP_ASSERT_UNCATEGORIZED(__z != nullptr, "The node to remove should not be null");
-    _LIBCPP_ASSERT_UNCATEGORIZED(std::__tree_invariant(__root), "The tree invariants should hold");
+    // TODO: Use in the new debug mode:
+    // _LIBCPP_DEBUG_ASSERT(std::__tree_invariant(__root), "The tree invariants should hold");
     // __z will be removed from the tree.  Client still needs to destruct/deallocate it
     // __y is either __z, or if __z has two children, __tree_next(__z).
     // __y will have at most one child.