Mon Sep 18 19:06:51 EDT 2006  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
  * Fixed two data family bugs
  Mon Aug 21 15:16:16 EDT 2006  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
    * Fixed two data family bugs
    - Too liberal pattern matching in `tcTyClDecl1'
    - Open TyCons must always be exposed (ie, never be turned into abstract tycons
      during tidying)