> > I cannot re-produce that, I'm afraid. On my system, both attributes > > testHaskell1 = self.haskell-ng.packages.ghc784.ghcWithPackages (hp: []); > testHaskell2 = self.haskell-ng.packages.ghc784.ghcWithPackages (hp: > with hp; [mtl]); > > seem to work fine. >
Right, they do work fine, but _differently_, which seems strange. I have: ~~~~ testHaskell1 = haskell-ng.packages.ghc784.ghcWithPackages (hp: []); testHaskell2 = haskell-ng.packages.ghc784.ghcWithPackages (hp: [hp.mtl]); ~~~~ And here is what I get: ~~~~ › nix-shell '<nixpkgs>' -A testHaskell2 --dry-run [nix-shell:~/proj/ghc/compiler/parser]$ exit › nix-shell '<nixpkgs>' -A testHaskell1 --dry-run these derivations will be built: /nix/store/s898z43nkjpzcizhcxcd71al9qd7plkh-ghc-7.8.4-src.tar.xz.drv these paths will be fetched (73.48 MiB download, 862.92 MiB unpacked): /nix/store/w4il8kp2jhmhmaxplx7i04y838k583mk-ghc-7.4.2-binary [nix-shell:~/proj/ghc/compiler/parser]$ exit ~~~~
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