~/G/project *develop> nix-shell develop.nix
download-from-binary-cache.pl: could not download ‘http://hydra.nixos.org/nix-cache-info’ (Curl error 22)
these derivations will be built:
  /nix/store/mkar0id7vykm9z3n69wc47s1r1vyxbwx-ghc-mod-5.8.0.0.drv
  /nix/store/rg67dvddy1apkq31vnqnnqmn4136dwn3-taggy-0.2.1.drv
  /nix/store/0acgpm07c7lz8grwlrwjw3cqvca6x84l-ghc-8.0.2-with-packages.drv
these paths will be fetched (11.23 MiB download, 160.80 MiB unpacked):
  /nix/store/45r5cyb2q7sy44yj7jfyz0l68yajdp17-haskell-src-exts-util-0.2.2
  /nix/store/94vvn0hf4qyirjx0wndnmkfkr2d6l5b7-stylish-haskell-0.8.1.0
  /nix/store/9rj6z3clrk8lf5bg20ba0i3cnp19m6nv-json-0.9.1
  /nix/store/bbyjmzp9lqfl2fwg6ap89yqlc77yh81y-conduit-1.2.12.1-doc
  /nix/store/cd1gxqfaa8aa40hna56255jzwxkdgf0m-hlint-2.1
  /nix/store/dm63a6ximbfkpfaqcjaixdbaha413vad-monad-journal-0.7.2-doc
  /nix/store/hnw1ln22hn6vi7sp10a69f6rwxr0gl3a-resourcet-1.1.9
  /nix/store/i26hwxzc7dvrqcld2kg8fb958h0q8b6s-hindent-5.2.5
  /nix/store/lk67fmhl0prasmvb524c57rj4ik2m1md-resourcet-1.1.9-doc
  /nix/store/msgah8xqj2rwax0vp99k3i4idvcffkn9-yaml-0.8.25
  /nix/store/mzcj0dybj9x4i8rqj94z8qvi09gn1r12-haskell-src-exts-1.20.1
  /nix/store/nx1q5h8zyv6nrgcibmcqc61zlxs1mxdv-monad-journal-0.7.2
  /nix/store/q4rd6smzvmr7rjplpf8ffp1sin3dpaal-ghc-syb-utils-0.2.3.3-doc
  /nix/store/qx96whgnb8ni3yipxf2fymxbjvxc6ac6-hasktags-0.69.4
  /nix/store/rbkpnfy5667w2a292w0agyn0zxi7x10y-conduit-1.2.12.1
  /nix/store/vljmsq3w5fcirn1sp1v3hhd7kbx4qr4a-haskell-src-exts-1.18.2
  /nix/store/wilzl45q9mjb96i20qjkgj1r1rzcahxf-ghc-syb-utils-0.2.3.3
  /nix/store/xcilw9szpb84dbgyvh3pzkr7pr6q98bb-yaml-0.8.25-doc
fetching path ‘/nix/store/vljmsq3w5fcirn1sp1v3hhd7kbx4qr4a-haskell-src-exts-1.18.2’...
fetching path ‘/nix/store/mzcj0dybj9x4i8rqj94z8qvi09gn1r12-haskell-src-exts-1.20.1’...
fetching path ‘/nix/store/9rj6z3clrk8lf5bg20ba0i3cnp19m6nv-json-0.9.1’...
fetching path ‘/nix/store/q4rd6smzvmr7rjplpf8ffp1sin3dpaal-ghc-syb-utils-0.2.3.3-doc’...
fetching path ‘/nix/store/dm63a6ximbfkpfaqcjaixdbaha413vad-monad-journal-0.7.2-doc’...
fetching path ‘/nix/store/lk67fmhl0prasmvb524c57rj4ik2m1md-resourcet-1.1.9-doc’...
building path(s) ‘/nix/store/bwy4rk0v4xrs515zb0l5cs3rz146ndhi-taggy-0.2.1-doc’, ‘/nix/store/j4byqjja3lldj0hmg4px1w9whjjnmnh5-taggy-0.2.1’, ‘/nix/store/sznf49xnwcnwy87qging6gq85h7wqma9-taggy-0.2.1-data’
setupCompilerEnvironmentPhase
Build with /nix/store/2jm3yirn5a2svafd27xwx96q0xlb1r3w-ghc-8.0.2.
unpacking sources
unpacking source archive /nix/store/d8canhcgw9wa2xxaciksi2mm9bid1s8l-taggy-0.2.1.tar.gz
source root is taggy-0.2.1
setting SOURCE_DATE_EPOCH to timestamp 1513851379 of file taggy-0.2.1/tests/unit/Spec.hs
patching sources
applying patch /nix/store/f2yllwm5vnr069ciq0h47ykiammgpfz9-blaze-markup.patch
patching file src/Text/Taggy/Renderer.hs
Reversed (or previously applied) patch detected!  Assume -R? [n]
Apply anyway? [n]
Skipping patch.
2 out of 2 hunks ignored -- saving rejects to file src/Text/Taggy/Renderer.hs.rej
builder for ‘/nix/store/rg67dvddy1apkq31vnqnnqmn4136dwn3-taggy-0.2.1.drv’ failed with exit code 1
killing process 7666
killing process 7668
killing process 7665
killing process 7664
killing process 7667
killing process 7669
cannot build derivation ‘/nix/store/0acgpm07c7lz8grwlrwjw3cqvca6x84l-ghc-8.0.2-with-packages.drv’: 1 dependencies couldn't be built
error: build of ‘/nix/store/0acgpm07c7lz8grwlrwjw3cqvca6x84l-ghc-8.0.2-with-packages.drv’ failed
/run/current-system/sw/bin/nix-shell: failed to build all dependencies