Simon Marlow wrote:
ANNOUNCING Happy 1.16 - The LALR(1) Parser Generator for Haskell
I'm pleased to announce version 1.16 of Happy, the parser generator system for Haskell.
Changes from version 1.15 to 1.16
* Switch to a Cabal build system: you need a recent version of Cabal (1.1.6 or later). If you have GHC 6.4.2, then you need to upgrade Cabal before building Happy. GHC 6.6 is fine.
* New %error directive
* New production forms: {%% .. } and {%^ .. }
* Added Attribute Grammar support, by Robert Dockins
NOTE: Happy version 1.16 is required for building GHC version 6.6 and later.
Small clarification: in fact only Happy 1.15 is required to build GHC 6.6, but Happy 1.15 could not be built using GHC 6.6, so really 1.16/6.6 is the only compatible combination. Cheers, Simon