[tlaplus] How come defined functions don't work in assignment?

[recepient recepient <netsmaza@xxxxxxxxx>]

To wit,
        define

          MasterHeadIdx(i)                                    == MasterState[i].HeadIdx
        end define;

This *does not work*:
         \* fragment in a process, procedure
         MasterHeadIdx(1) := MasterHeadIdx(1)+1;

This *does work*:
         MasterState[1].HeadIdx := MasterState[1].HeadIdx + 1;

The inability to use defined functions in assignment half-defeats the utility
of the define by making one use **and not use** defined functions depending
on context.

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