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I’m trying to define an infix operator but I keep getting errors. I’m using GNU Prolog 1.4.
I tried this:
[user].
op(35, xfx, =>).
ctrl-D
But got the error “native code procedure op/3 cannot be redefined (ignored)”
I also tried op(35, xfx, ‘=>’). and got the same error, and tried doing it without typing in [user]. first, but when I tried to actually use the operator I got an existence_error.
yup you need to run the predicate instead of defining it. To do that just insert
:-before yourop/3call.