Set up simple stack project

.gitignore

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+.stack-work/
+*~
+client_session_key.aes

LICENSE

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+Copyright (c) 2020 Garmelon
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+import           Props
+
+main :: IO ()
+main = putStrLn helloWorld

package.yaml

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+name: props
+version: 0.1.0.0
+license: MIT
+author: Garmelon <joscha@plugh.de>
+copyright: 2020 Garmelon
+
+extra-source-files:
+- README.md
+- LICENSE
+
+extra-doc-files:
+- README.md
+
+dependencies:
+- base >= 4.7 && < 5
+
+library:
+  source-dirs: src
+
+executables:
+  props:
+    main: Main.hs
+    source-dirs: app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - props

props.cabal

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+cabal-version: 1.18
+
+-- This file has been generated from package.yaml by hpack version 0.33.0.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: 057a536ac3d0fd40b3122084eee53201158527bbcd0dbac7cec33d8fd06cf208
+
+name:           props
+version:        0.1.0.0
+author:         Garmelon <joscha@plugh.de>
+maintainer:     Garmelon <joscha@plugh.de>
+copyright:      2020 Garmelon
+license:        MIT
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    LICENSE
+extra-doc-files:
+    README.md
+
+library
+  exposed-modules:
+      Props
+  other-modules:
+      Paths_props
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.7 && <5
+  default-language: Haskell2010
+
+executable props
+  main-is: Main.hs
+  other-modules:
+      Paths_props
+  hs-source-dirs:
+      app
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , props
+  default-language: Haskell2010

src/Props.hs

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+module Props where
+
+helloWorld :: String
+helloWorld = "Hello World!"

stack.yaml

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+resolver:
+  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/23.yaml
+
+packages:
+- .

stack.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 532832
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/23.yaml
+    sha256: fbb2a0519008533924c7753bd7164ddd1009f09504eb06674acad6049b46db09
+  original:
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/23.yaml