@Override public Object execute(VirtualFrame frame) { // TODO(cs): can module ever not evaluate to a RubyModule? final RubyModule moduleObject = (RubyModule) module.execute(frame); final Object rhsValue = rhs.execute(frame); assert rhsValue != null; assert !(rhsValue instanceof String); moduleObject.setModuleConstant(name, rhsValue); return rhsValue; }