[Nix-dev] Nixpkgs [haskell] overlay

[Manuel Pages]

Dear Kirill and Peter,

first of all, thank you sincerely for your replies.

I am aware of both options, sadly they don't fit our needs as is.

What we aim for is something akin to wavewave's overlay for
High Energy Physics-related nix expressions, but injecting into
haskellPackages. Bundled and maintained as a git repository

That being said, I presume that it is a reasonable idea to simply
write an expression that will define an overlay "configuration.nix",
merge it together with user's configuration.nix and shove the result
of x // y into ``config`` field of all-packages expression.

Any reasons why not to do it like this?
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