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Haskell Cookbook by Yogesh Sajanikar

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How to do it...

  1. Create a new project, routing-in-snap, with a simple stack template. We use lts-9.1 as a resolver package archive. You can use the latest one available on Stackage. Just make sure that you use the same resolver later to solve the dependency constraints:
        stack --resolver lts-9.1 new routing-in-snap simple
  1. Add a dependency on the following libraries in the build-depends subsection of the executable section, as follows:
        executable routing-in-snap
        hs-source-dirs:      src
        main-is:             Main.hs
        default-language:    Haskell2010
        build-depends:       base >= 4.7 && < 5
                       , snap-server
                       , snap-core
                       , snap
                       , lens
                       , bytestring
                       , text
  1. Use the following command to solve the dependency constraints to update the stack.yaml file:
 stack --resolver lts-9.1 ...

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