Support for GHC8.10

Unable to create shell. See NixOS/nixpkgs#85446

nix/derivations/ghc810/lens.nix

@@ -0,0 +1,41 @@
+{ mkDerivation, array, base, base-compat, base-orphans, bifunctors
+, bytestring, Cabal, cabal-doctest, call-stack, comonad, containers
+, contravariant, criterion, deepseq, directory, distributive
+, doctest, exceptions, filepath, free, generic-deriving, ghc-prim
+, hashable, HUnit, kan-extensions, mtl, nats, parallel, profunctors
+, QuickCheck, reflection, semigroupoids, semigroups, simple-reflect
+, stdenv, tagged, template-haskell, test-framework
+, test-framework-hunit, test-framework-quickcheck2, text
+, th-abstraction, transformers, transformers-compat
+, unordered-containers, vector
+}:
+mkDerivation {
+  pname = "lens";
+  version = "4.19.2";
+  sha256 = "52f858ae3971a5104cdba5e81a27d154fda11fe65a54a4ac328c85904bdec23b";
+  revision = "2";
+  editedCabalFile = "1bp6s0ifwdmzv946krxgxqakw02iriqmzvvcypwrgcynrn9wkn9y";
+  setupHaskellDepends = [ base Cabal cabal-doctest filepath ];
+  libraryHaskellDepends = [
+    array base base-orphans bifunctors bytestring call-stack comonad
+    containers contravariant distributive exceptions filepath free
+    ghc-prim hashable kan-extensions mtl parallel profunctors
+    reflection semigroupoids tagged template-haskell text
+    th-abstraction transformers transformers-compat
+    unordered-containers vector
+  ];
+  testHaskellDepends = [
+    base bytestring containers deepseq directory doctest filepath
+    generic-deriving HUnit mtl nats parallel QuickCheck semigroups
+    simple-reflect test-framework test-framework-hunit
+    test-framework-quickcheck2 text transformers unordered-containers
+    vector
+  ];
+  benchmarkHaskellDepends = [
+    base base-compat bytestring comonad containers criterion deepseq
+    generic-deriving transformers unordered-containers vector
+  ];
+  homepage = "http://github.com/ekmett/lens/";
+  description = "Lenses, Folds and Traversals";
+  license = stdenv.lib.licenses.bsd2;
+}

nix/overrides.nix

@@ -1,12 +1,13 @@
 {
   # List of GHC versions for which we apply overrides
-  versions = ["ghc844" "ghc865" "ghc883" "ghcjs"];
+  versions = ["ghc844" "ghc865" "ghc883" "ghc8101" "ghcjs"];
   # List of packages with custom overrides
   derivations = {
     haskell = ./derivations/haskell;
     ghc844  = ./derivations/ghc84;
     ghc865  = ./derivations/ghc86;
     ghc883  = ./derivations/ghc88;
+    ghc8101 = ./derivations/ghc810;
   };
   # Common overrides for librarise
   haskell = {
@@ -24,6 +25,19 @@
   };
   ghc883 = {
   };
+  ghc8101 = {
+    generic-lens    = { check     = false; };
+    monad-par       = { check     = false; };
+    http-media      = { jailbreak = true; };
+    cborg           = { jailbreak = true; };
+    serialise       = { jailbreak = true; };
+    microlens-th    = { jailbreak = true; };
+    retry           = { jailbreak = true; };
+    safe-exceptions = { jailbreak = true; };
+    vault           = { jailbreak = true; };
+    servant         = { jailbreak = true; check = false; };
+    servant-server  = { jailbreak = true; check = false; };
+  };
   ghcjs = {
     SHA                   = { check = false; };
     cborg                 = { check = false; };

nix/release.nix

@@ -86,9 +86,10 @@ let
     in
     {
       inherit pkgs;
-      ghc844 = hschainPkgAll;
-      ghc865 = hschainPkgAll;
-      ghc883 = hschainPkgAll;
-      ghcjs  = hschainPkgJs;
+      ghc844  = hschainPkgAll;
+      ghc865  = hschainPkgAll;
+      ghc883  = hschainPkgAll;
+      ghc8101 = hschainPkgAll;
+      ghcjs   = hschainPkgJs;
     };
 in release