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MonadFail compatibility #21

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@nomeata

Trying to build the current package with GHC-8.6, I get:

[13 of 31] Compiling Graphics.PDF.Draw ( Graphics/PDF/Draw.hs, dist/build/Graphics/PDF/Draw.o )

Graphics/PDF/Draw.hs:256:5: error:
    • No instance for (Control.Monad.Fail.MonadFail Draw)
        arising from a do statement
        with the failable pattern ‘(x : xs)’
    • In a stmt of a 'do' block: (x : xs) <- gets supplyNames
      In the expression:
        do (x : xs) <- gets supplyNames
           modifyStrict $ \ s -> s {supplyNames = xs}
           return x
      In an equation for ‘supplyName’:
          supplyName
            = do (x : xs) <- gets supplyNames
                 modifyStrict $ \ s -> ...
                 return x
    |
256 |     (x:xs) <- gets supplyNames
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Failed to build HPDF-1.4.10 (which is required by exe:tttool from
tttool-1.8).

It would be great to have HPDF with current versions of GHC, as tttool heavily relies on it.

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