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    • simonpj@microsoft.com's avatar
      Improve Simplifier and SpecConstr behaviour · 70ad6e6a
      simonpj@microsoft.com authored
      Trac #4908 identified a case where SpecConstr wasn't "seeing" a
      specialisation it should easily get.  The solution was simple: see
      Note [Add scrutinee to ValueEnv too] in SpecConstr.
      
      Then it turned out that there was an exactly analogous infelicity in
      the mighty Simplifer too; see Note [Add unfolding for scrutinee] in
      Simplify. This fix is good for Simplify even in the absence of the
      SpecConstr change.  (It arose when I moved the binder- swap stuff to
      OccAnall, not realising that it *remains* valuable to record info
      about the scrutinee of a case expression.  The Note says why.
      
      Together these two changes are unconditionally good.  Better
      simplification, better specialisation. Thank you Max.
      70ad6e6a
    • Simon Marlow's avatar
      fix warning · 209e0935
      Simon Marlow authored
      209e0935
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