WIP: survey: Add/default to ghc8101. Still breaking

WIP because breaking builds should not be default;
just for development convenience.

Author: nh2

survey/default.nix

@@ -35,16 +35,17 @@ in
   ])."${approach}",
 
   # When changing this, also change the default version of Cabal declared below
-  compiler ? "ghc865",
+  compiler ? "ghc8101",
 
   defaultCabalPackageVersionComingWithGhc ?
     ({
       ghc822 = "Cabal_2_2_0_1"; # TODO this is technically incorrect for ghc 8.2.2, should be 2.0.1.0, but nixpkgs doesn't have that
       ghc844 = "Cabal_2_2_0_1";
       ghc863 = throw "static-haskell-nix: ghc863 is no longer supported, please upgrade";
-      ghc864 = throw "static-haskell-nix: ghc863 is no longer supported, please upgrade";
+      ghc864 = throw "static-haskell-nix: ghc864 is no longer supported, please upgrade";
       ghc865 = "Cabal_2_4_1_0"; # TODO this is technically incorrect for ghc 8.6.5, should be 2.4.0.1, but nixpkgs doesn't have that
       ghc881 = "Cabal_3_0_0_0";
+      ghc8101 = "Cabal_3_2_0_0";
     }."${compiler}"),
 
   # Use `integer-simple` instead of `integer-gmp` to avoid linking in