Update lib to support ghc 9 & associated base

[creichert]

No description provided.

[creichert]

Not working:

• stack.yaml

extra-deps:
  - github: rbros/stdlib.hs
    commit: 61fe5961cf7a56d1c26aab61786e1e0c2574c80c

• package.yaml

dependencies:
  - name: base
    mixin:
      - hiding (Prelude)
  - name: stdlib
    mixin:
      - (StdLib as Prelude)

Breaks cabal Paths_ file

    Variable not in scope: (++) :: String -> String -> FilePath
    Suggested fix:
      Perhaps use one of these:
        ‘List.++’ (imported from Data.List), ‘+’ (imported from Prelude),
        data constructor ‘:+’ (imported from Prelude)
   |
70 |   | isPathSeparator (List.last dir) = dir ++ fname