Replace case of with do blocks for Either

sdiehl / write-you-a-haskell

Building a modern functional compiler from first principles. (http://dev.stephendiehl.com/fun/)

MIT License

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Open owickstrom opened 8 years ago

owickstrom commented 8 years ago

Also changed version constraints on base to make the poly_constraints project build with GHC 7.10.2 on OSX.