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    • Simon Peyton Jones's avatar
      Add test for type families, discovered by Roman · fb17b356
      Simon Peyton Jones authored
      Tests this patch:
      
        Fri Dec 11 12:01:22 GMT 2009  simonpj@microsoft.com
          * Fix two related bugs in u_tys
          
          When we normalise a type family application we must recursively call
          uTys, *not* 'go', because the latter loop is only there to look
          through type synonyms.  This bug made the type checker generate
          ill-typed coercions, which were rejected by Core Lint.
          
          A related bug only affects the size of coercions.  If faced with
            (m a) ~ (F b c)
          where F has arity 1, we want to decompose to 
             m ~ F Int,  a ~ c
          rather than deferring.  The application decomposition was being
          tried last, so we were missing this opportunity.
      fb17b356
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