ghc841: GHC 8.4.1: nix-shell -p haskell.compiler.ghc841

pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix

@@ -0,0 +1,44 @@
+{ pkgs, haskellLib }:
+
+with haskellLib;
+
+self: super: {
+
+  # Use the latest LLVM.
+  inherit (pkgs) llvmPackages;
+
+  # Disable GHC 8.4.x core libraries.
+  #
+  # Verify against:
+  # ls /nix/store/wnh3kxra586h9wvxrn62g4lmsri2akds-ghc-8.4.20180115/lib/ghc-8.4.20180115/ -1 | sort | grep -e '-' | grep -Ev '(txt|h|targets)$'
+  array = null;
+  base = null;
+  binary = null;
+  bytestring = null;
+  Cabal = null;
+  containers = null;
+  deepseq = null;
+  directory = null;
+  filepath = null;
+  bin-package-db = null;
+  ghc-boot = null;
+  ghc-boot-th = null;
+  ghc-compact = null;
+  ghci = null;
+  ghc-prim = null;
+  haskeline = null;
+  hpc = null;
+  integer-gmp = null;
+  mtl = null;
+  parsec = null;
+  pretty = null;
+  process = null;
+  stm = null;
+  template-haskell = null;
+  terminfo = null;
+  text = null;
+  time = null;
+  transformers = null;
+  unix = null;
+  xhtml = null;
+}