Those primitives will fail unless the receiver, the argument and the 
result fit into 64 bits. The LargeIntegers plugin provides primitives 
without such limitation, so currently the latter is in use.

Levente

On Sun, 30 Dec 2018, Fabio Niephaus wrote:

> Hi all,
>
> I just noticed that Squeak-trunk does not use the primitives for
> LargeIntegers bit operations (#34 to #37). Is there are good reason
> for this (disabled in the VM?) or is this just a mistake? See:
>
> SystemNavigation default browseAllSelect: [:cm | cm primitive between:
> 34 and: 37]
>
> Fabio