Merge branch 'master' into string-common-fixes

shell.nix

@@ -0,0 +1,46 @@
+let 
+  purescript-overlay =
+    builtins.fetchGit {
+      name = "purescript-overlay";
+      url = "https://github.com/thomashoneyman/purescript-overlay.git";
+      rev = "526c92c34a1a0213dc5c4761756375e13d85f8d4";
+    };
+  purerlReleases =
+    builtins.fetchGit {
+      url = "https://github.com/purerl/nixpkgs-purerl.git";
+      ref = "master";
+      rev = "69ea3146f3c4f715c5dbc6e0f8ba7d0ee57bb3bd";
+    };
+  erlangReleases =
+    builtins.fetchGit {
+      name = "nixpkgs-nixerl";
+      url = "https://github.com/id3as/nixpkgs-nixerl.git";
+      rev = "2822128d0fe5c8aac42f0b80045e80e6ac22bfcc";
+    };
+
+  pkgs = import <nixpkgs> {
+      overlays = [
+        (import purescript-overlay).overlays.default
+        (import purerlReleases)
+        (import erlangReleases)
+
+      ];
+    };
+  erlang = pkgs.nixerl.erlang-26-1;
+
+in
+
+pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs.buildPackages; 
+      [ 
+        nodejs 
+        spago-unstable
+        purs-bin.purs-0_15_14
+        purs-tidy
+        purerl.purerl-0-0-22
+        erlang.erlang
+    ];
+
+}
+