Yet another ivar setting.

src/ProfStef.js

@@ -1204,7 +1204,7 @@ messageSends: []
 $globals.ProfStef);
 
 
-$core.setInstanceVariables($globals.ProfStef.a$cls, ["instance"]);
+$core.setSlots($globals.ProfStef.a$cls, ["instance"]);
 $core.addMethod(
 $core.method({
 selector: "default",