With the resolver set to resolver: nightly-2018-03-01, a package depending on hakyll always rebuilds haddock-library, pandoc, pandoc-citeproc and hakyll. This does not happen if I set the resolver to resolver: lts-10.7. The rebuilds cause significant slowdowns.

Both pandoc and pandoc-citeproc seem to be extra-deps of hakyll. Maybe this is related?

Steps to reproduce

1. In stack.yaml, set resolver: nightly-2018-03-01.
2. Run command stack build.
3. Run command stack build again.

package.yaml:

name: repro

dependencies:
- base >= 4.7 && < 5
- hakyll

library:
  source-dirs: src

Expected

The second stack build should not build anything again.

Actual

haddock-library, pandoc, pandoc-citeproc and hakyll are rebuilt.

Output of the second stack build --verbose: https://gist.github.com/st3ll1s/3ef40d7d3e5513a31ef031bab129deff

Stack version

root@9aa4322411fe ~# stack --version
Version 1.6.5, Git revision 24ab0d6ff07f28276e082c3ce74dfdeb1a2ca9e9 (5514 commits) x86_64 hpack-0.20.0

Method of installation

curl -sSL https://get.haskellstack.org/ | sh