/* custom error: Cannot guarantee single use in static analysis, consider using DynamicLinear */
$x = WithSideEffects(ToMutDict({1:2},null));
$z = WithSideEffects(ToMutDict({3:4},null));
$y = IF_STRICT(
        Opaque(true),
        ($x,1),
        ($z,2)
        );
select 
    FromMutDict($y.0), $y.1