11 Jun
2013
11 Jun
'13
5:48 p.m.
Hi,
The primary motivation for removing these instances is that they cause endless confusion for beginners [...]
Not sure what that means for this discussion, but enumFromTo is already confusing without considering floating point numbers:
Prelude> [fromInteger 1, fromInteger 3 .. fromInteger 4] :: [Rational] [1 % 1,3 % 1,5 % 1] Prelude> map fromInteger [1, 3 .. 4] :: [Rational] [1 % 1,3 % 1]
In general, I would be against removing features just because they are confusing for beginners. I don't think that's a good design principle for a language that is primarily targeted at professional programmers and computer scientists. Tillmann