Re: Instead of pcase

[Richard Stallman]

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  > Consider another example:

  > (match* (xor (not var) t) t)

My first repsonse was to say that xor is not valid
in cond* patterns.  Indeed, I did not know that this
function `xor' existed.

But now I see that your example does fit the definition of
cond* patters, and its meaning is quite unintuitive.

I wonder why people defined `xor'.  It can't be used
as a conditional, like `and' and `or', so what is the point of it?

Anyway, I suppose the best response is to say that such counterintuitive
constrained variables are best avoided.  Or else specifically disallow
`xor' as PRED in a constrained variable.


-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)