Add exceptions and stm to nonReinstallablePkgs for ghc901

Author: locallycompact

modules/component-driver.nix

@@ -61,7 +61,7 @@ in
     ]
     # TODO make this unconditional
     ++ lib.optionals (config.compiler.nix-name == "ghc901") [
-      "ghc-bignum" ]
+      "ghc-bignum" "exceptions" "stm"]
     ++ lib.optionals (!config.reinstallableLibGhc) [
       "ghc-boot"
       "ghc" "Cabal" "Win32" "array" "binary" "bytestring" "containers"
@@ -70,7 +70,6 @@ in
       "hpc"
       "mtl" "parsec" "process" "text" "time" "transformers"
       "unix" "xhtml" "terminfo"
-      # "stm"
     ];
 
   options.bootPkgs = lib.mkOption {