The Haskell Home Page, The Definition of the Language

Changes from Haskell 1.3 to Haskell 1.4

Haskell 1.4 is generally compatible with 1.3 - most of these changes are upward compatible. You may have problems with type signatures containing Enum if Ord instances are also used - you must add an explicit Ord context now that Enum does not imply Ord. The change in the fixity of >>= may also lead to incompatiblity. Instances which rely on the defaults in the class Enum may break.

Last update: September 16th, 1998