Does that also mean that you could write:
if 3 - 4 then ... else ... (= if (fromInteger 3 :: Bool) - (fromInteger 4 :: Bool) then ... else ...)
No. 3 - 4 is an Integer, the proposal is to convert Bools to Ints, not Ints to Bools. Of course, Lennart has been asking for precisely this functionality (overloaded Booleans) for some time - so one day it may be possible! You could however do: if 3 then ... else ..
If you change fromInteger in Num Bool to be fromInteger x = x /= 0, then we could all start writing nasty C-like if-expressions...
Yeah, the more people give examples of the power of Num Bool, the more it seems like a very bad idea! Which is a shame, having Bits on Bool seems entirely logical, having Num a superclass of Bits seems a little less clear. Thanks Neil