Though I'm abusing enumerations, I'm surprised that a and b
give different answers (in Hugs 1.4 on Linux). Is that intended?
default (Integer,Rational)
a = take 3 [1/1,3/2 .. 2/1] -- [1%1,3%2,2%1]
b = take 3 [1/1,3/2 ..] -- [1%1,1%1,1%1]
Doug McIlroy