[nhc-bugs] EnumFromThen

Hello, I found a bug in nhc98-1.18. $ diff src/prelude/Prelude/Enum_Integer.hs src/prelude/Prelude/Enum_Integer.hs ~ 14c14 < enumFromThen x y = x : enumFromThen y (2*y-x) ---

enumFromThen x y = x : enumFromThen y (2*y+x)

-- Yoichi Hanatani