Testing Nix Shebang file

NixShebang.sh

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+#! /usr/bin/env nix-shell
+#! nix-shell -p "haskellPackages.ghcWithPackages (ps: with ps; [turtle])"
+#! nix-shell -i runghc
+
+{-# LANGUAGE OverloadedStrings #-}
+
+import Turtle
+
+main :: IO ()
+main = do
+  echo "Hello, World!"