Furthermore, export "name" and "version" attributes that match those of the
underlying compiler. These changes make a ghcWithPackages-generated wrapper
look exactly like a normal GHC derivation and it can be used anywhere in
Nixpkgs where a normal GHC would be used.
deepOverride turns out to be completely unfeasible for non-trivial overrides.
Nix evaluates for an eternity, and then comes back saying:
Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS
nix-instantiate killed by signal 6
The hand-written deep-override, on the other hand, performs the job in a
fraction of a second, no problem.
All bow to Russell O'Connor!
