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Re: [tlaplus] Symmetry sets
A TypeOK invariant would work great. And it would have the added benefit of throwing an error at the exact step in which the set is no longer satisfying the invariant, rather than waiting for the CHOOSE to take place.
This will make it much easier to track down _why_ things went awry.
The only reason I see that an invariant wouldn’t be feasible is if the set in question is not one of your variables. If it’s some computer value, then you’d need to use an assert.
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