Use NixOS 19.09

.travis.yml

@@ -395,14 +395,14 @@ matrix:
         - export NIX_CONF_DIR=~
         - echo "binary-caches = https://cache.nixos.org https://ihaskell.cachix.org" >> $NIX_CONF_DIR/nix.conf
         - echo "binary-cache-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= ihaskell.cachix.org-1:WoIvex/Ft/++sjYW3ntqPUL3jDGXIKDpX60pC8d5VLM=" >> $NIX_CONF_DIR/nix.conf
-        - glibcLocales=$(nix-build https://github.com/NixOS/nixpkgs-channels/tarball/nixos-19.03 -A glibcLocales)
+        - glibcLocales=$(nix-build https://github.com/NixOS/nixpkgs-channels/tarball/nixos-19.09 -A glibcLocales)
         - echo $glibcLocales
         - export LOCALE_ARCHIVE_2_27="${glibcLocales}/lib/locale/locale-archive"
       script:
         - >
           nix-build
-          -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/tarball/nixos-19.03
+          -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/tarball/nixos-19.09
           release.nix
-          --argstr compiler "ghc864"
-        - nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/tarball/nixos-19.03 -p cachix --run 'cachix push ihaskell result'
+          --argstr compiler "ghc865"
+        - nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/tarball/nixos-19.09 -p cachix --run 'cachix push ihaskell result'
         - test/acceptance.nbconvert.sh result/bin/ihaskell-nbconvert

release-8.6.nix

-{ compiler ? "ghc864"
+{ compiler ? "ghc865"
 , nixpkgs ? import <nixpkgs> {}
 , packages ? (_: [])
 , pythonPackages ? (_: [])

release.nix

@@ -45,14 +45,9 @@ let
       });
       ghc-parser        = self.callCabal2nix "ghc-parser" ghc-parser-src {};
       ipython-kernel    = self.callCabal2nix "ipython-kernel" ipython-kernel-src {};
-      zeromq4-haskell   = self.callHackage "zeromq4-haskell" "0.8.0" {};
 
-      haskell-src-exts  = self.haskell-src-exts_1_21_0;
       inline-r          = nixpkgs.haskell.lib.dontCheck super.inline-r;
       static-canvas     = nixpkgs.haskell.lib.doJailbreak super.static-canvas;
-      system-fileio     = nixpkgs.haskell.lib.doJailbreak super.system-fileio;
-      Chart             = nixpkgs.haskell.lib.doJailbreak super.Chart;
-      Chart-cairo       = nixpkgs.haskell.lib.doJailbreak super.Chart-cairo;
     } // displays self);
   });
   ihaskellEnv = haskellPackages.ghcWithPackages (self: [ self.ihaskell ] ++ packages self);