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[tlaplus] Understanding PlusCal 'either' translation to TLA



I'm following Hillel Wayne's book car & traffic light example and found that doing

either
    do_something := TRUE
or
    skip;
end either;

In PlusCal gets translated to:

\/ /\ do_something' = TRUE
\/ /\ TRUE
    /\ UNCHANGED do_something

And replacing this with:

do_something' = TRUE \/ UNCHANGED do_something

Doesn't work.

Why aren't those equivalent?

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