Cabal woe

[Simon Peyton Jones]

Friends

I'm trying to repro #25064 with my development build of GHC.  The test case
depends on packages `primitive` and `hashtables`.  So I try this (see
below).

Alas, apparently after the `cabal install`, it can't find Prelude.

What should I do?  I tried removing the "environments" file, whatever that
is, which then meant it could find Prelude -- but the libraries were no
longer installed.

I lack a decent model of what is going on with installing packages for my
development builds.   Is there a write up anywhere?

Thanks

Simon


bash$ cabal install --lib hashtables primitive --with-compiler
$HOME/code/HEAD/$s2
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.10.1.0 supports
'ghc' version < 9.8): /home/simonpj/code/HEAD/_build/stage1/bin/ghc is
version
9.11.20240517
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.10.1.0 supports
'ghc' version < 9.8): /home/simonpj/code/HEAD/_build/stage1/bin/ghc is
version
9.11.20240517
Resolving dependencies...
bash$  ~/code/HEAD/$s2 -c T25064.hs
Loaded package environment from
T25064.hs:1:8: error: [ ]8;;https://errors.haskell.org/messages/GHC-87110
\GHC-87110 ]8;; \]
    Could not load module ‘Prelude’.
    It is a member of the hidden package ‘base-4.20.0.0’.
    Use -v to see a list of the files searched for.
  |
1 | module Bug where
  |        ^^^

bash$ rm /home/simonpj/.ghc/x86_64-linux-9.11.20240517/environments/default
bash$ ~/code/HEAD/$s2 -c T25064.hs
T25064.hs:3:1: error: [ ]8;;https://errors.haskell.org/messages/GHC-61948
\GHC-61948 ]8;; \]
    Could not find module ‘Control.Monad.Primitive’.
    Perhaps you meant Control.Monad.Writer (from mtl-2.3.1)
    Use -v to see a list of the files searched for.
  |
3 | import Control.Monad.Primitive
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

T25064.hs:4:1: error: [ ]8;;https://errors.haskell.org/messages/GHC-87110
\GHC-87110 ]8;; \]
    Could not find module ‘Data.HashTable.ST.Basic’.
    Use -v to see a list of the files searched for.
  |
4 | import qualified Data.HashTable.ST.Basic as H
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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