[tlaplus] pluscal: with vs local variable - change in distinct states for action

["thisismy...@xxxxxxxxx" <thisismyidashish@xxxxxxxxx>]

Hello Folks

I am using pluscal for writing a spec. If i create a local variable X and then update a global variable Y based on it, i see 1000 distinct states for that action. However, if i use `with` in action for X, then i see 0 distinct states.

I added a assert in `with` case to be sure that Y is changing in some cases as expected.

Is this a cause for concern ?

If not, does this mean that for this action, in 0 distinct case, those states were already seen by TLC ?

E.g.

> 0 Distinct states for DeleteX:

process X = "X"
begin DeleteX:
    while TRUE do
        with X = SelectSeq(gX, isY);
            beforeLen = Len(gY)
            do
            Y := SelectSeq(Y, LAMBDA p: ~YE(p, someCheck));
            assert beforeLen = Len(Y)
        end with;
    end while;
end process;

VS
> Over 1k distinct states for DeleteX:
process X = "X"
variable localX = <<>>
begin DeleteX:
    while TRUE do
    localX := SelectSeq(gX, isY);
        Y := SelectSeq(Y, LAMBDA p: ~YE(p, someCheck));
        end with;
    end while;
end process;

Thanks

Ashish

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