Update/correct boot packages list.

src/Stack2nix/Render.hs

@@ -40,7 +40,18 @@ import           Text.PrettyPrint.HughesPJClass          (Doc, fcat, nest,
                                                           pPrint, punctuate,
                                                           semi, space, text)
 
--- TODO: this only covers GHC 8.0.2
+-- Boot packages (wired-in and non-wired-in).
+-- These are set to `null` in the generated nix package set.
+-- The wired-in packages follow
+--    * https://github.com/commercialhaskell/stack/blob/d8e942ea69eb189f67a045f0c595612034dbb75d/src/Stack/Constants.hs#L102
+--    * https://downloads.haskell.org/~ghc/7.10.1/docs/html/libraries/ghc/src/Module.html#integerPackageKey
+-- For recent GHC releases:
+--    * https://github.com/ghc/ghc/blob/ghc-8.2.2-release/compiler/basicTypes/Module.hs#L1073
+--    * https://github.com/ghc/ghc/blob/ghc-8.4.4-release/compiler/basicTypes/Module.hs#L1078
+--    * https://github.com/ghc/ghc/blob/ghc-8.6.4-release/compiler/basicTypes/Module.hs#L1066 (got rid of "dph-seq" and "dph-par")
+--    * https://github.com/ghc/ghc/blob/334dd6da47326f47b/compiler/basicTypes/Module.hs#L1088 (in-progress 8.8)
+-- TODO: This should probably be dependent on the GHC version used.
+--       A split into wired-in and not-wired-in packages may also be advisable.
 basePackages :: Set String
 basePackages = Set.fromList
   [ "array"
@@ -53,15 +64,21 @@ basePackages = Set.fromList
   , "containers"
   , "deepseq"
   , "directory"
+  , "dph-par" -- for GHC < 8.6
+  , "dph-seq" -- for GHC < 8.6
   , "filepath"
+  , "ghc"
   , "ghc-boot"
   , "ghc-boot-th"
   , "ghc-prim"
   , "ghci"
   , "haskeline"
   , "hoopl"
   , "hpc"
-  , "integer-gmp"
+  , "integer-gmp" -- for GHC < 8.8
+  , "integer-simple" -- for GHC < 8.8
+  , "integer-wired-in" -- for GHC >= 8.8, see https://gitlab.haskell.org/ghc/ghc/commit/fc2ff6dd7496a33bf68165b28f37f40b7d647418
+  , "interactive"
   , "pretty"
   , "process"
   , "rts"