Syntax polymorphism violates the principle of least surprise.  It is, 
indeed, Teh Eevil.

~~ Robert.

Stefan Monnier wrote:
>> Is this a good idea?
>>     
>
> Don't think so: it doesn't help the case where you want to use negation on
> a variable rather than a constant, so it introduces a fairly
> subtle inconsistency which doesn't seem to be worth the trouble.
>
> I guess in Haskell you could use type class trickery so that
>
>   "f - 3" substracts 3 from f if f is numeric and passes -3 to f if f is
>   a function (I leave the case where f is both a function and a member of
>   the Number class as an exercise to the user).
>
> that would be even more evil,
>
>
>         Stefan
>
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