Index: generic/nsf.c
===================================================================
diff -u -rebec7eae38295e8fb4ae5fab6b6abcffb0a9c1fe -r33118e1862db3fc5fb5be108ee400356d95a1d4b
--- generic/nsf.c	(.../nsf.c)	(revision ebec7eae38295e8fb4ae5fab6b6abcffb0a9c1fe)
+++ generic/nsf.c	(.../nsf.c)	(revision 33118e1862db3fc5fb5be108ee400356d95a1d4b)
@@ -2467,6 +2467,8 @@
     for (; classMixins != NULL; classMixins = classMixins->nextPtr) {
       NsfClass *sc = NsfGetClassFromCmdPtr(classMixins->cmdPtr);
 
+      /* TODO: Why is here no sc->color == GRAY shortcut? */
+      
       if (likely(sc != NULL) && sc->color == WHITE) {
         TopoSort2(sc, direction, baseClass, withMixinOfs, &foundCycle);
         if (foundCycle) {