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FENCE() implementation #3

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@aksr

I was just wondering if FENCE() implementation is planned/possible?

Almost all examples from spitbol's manual don't work with Coppen's implementation of FENCE function.
Coppen already noted this (as you're certainly aware):

In the system implementation of FENCE(), alternatives really are discarded[, here] all alternatives to P are tested
(possibly causing all kinds of side effects). This shortcoming will be most problematic if alternatives within P
involve ABORT, FENCE, unevaluated expressions and unconditional value  assignment.

There is one attempt here, not sure how successful: https://github.com/snobol4ever/csnobol4

P.S: I plan (as soon as I have the time) to report issues (including ones I already sent to you Phil).

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