Added eff-20140928

pkgs/development/interpreters/eff/default.nix

@@ -0,0 +1,35 @@
+{ stdenv, fetchgit, ocaml, findlib, menhir, which }:
+
+let inherit (stdenv.lib) getVersion versionAtLeast; in
+
+assert versionAtLeast (getVersion ocaml) "3.12";
+
+stdenv.mkDerivation {
+
+  name = "eff-20140928";
+
+  src = fetchgit {
+    url = "https://github.com/matijapretnar/eff.git";
+    rev = "90f884a790fddddb51d4d1d3b7c2edf1e8aabb64";
+    sha256 = "28e389b35e6959072c245c2e79fe305885b1b2d44ff540a02a097e09e9f9698f";
+  };
+
+  buildInputs = [ ocaml findlib menhir which ];
+
+  doCheck = true;
+  checkTarget = "test";
+
+  meta = with stdenv.lib; {
+    homepage = "http://www.eff-lang.org";
+    description = "A functional programming language based on algebraic effects and their handlers";
+    longDescription = ''
+      Eff is a functional language with handlers of not only exceptions,
+      but also of other computational effects such as state or I/O. With
+      handlers, you can simply implement transactions, redirections,
+      backtracking, multi-threading, and much more...
+    '';
+    license = licenses.bsd2;
+    platforms = ocaml.meta.platforms;
+    maintainers = [ maintainers.jirkamarsik ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -3507,6 +3507,8 @@ let
 
     easy-format = callPackage ../development/ocaml-modules/easy-format { };
 
+    eff = callPackage ../development/interpreters/eff { };
+
     eliom = callPackage ../development/ocaml-modules/eliom { };
 
     findlib = callPackage ../development/tools/ocaml/findlib { };