[erlang-questions] Illegal Guard?

[Theepan]

>
> > Why do you think "f(X, Y) when U = X+Y, U > 0 ; V = Y*X, V < 0 ->" is
> > wrong?
>
> Because the language specification and the compiler say it is.
>
>
Rewording my question :) - why it is wrong to allow such guard expressions
at the compiler level?
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