$ pwd
/Users/maxim/depot/o/o3/n2o
bash-3.2$ cat stack.yaml
resolver: lts-12.12
packages:
- .
extra-deps:
- n2o-nitro-0.11.2
bash-3.2$ stack build

Error: While constructing the build plan, the following exceptions were encountered:

Dependency cycle detected in packages:
    [n2o,n2o-nitro,n2o]

Some different approaches to resolving this:

  * Consider trying 'stack solver', which uses the cabal-install solver to attempt to find some working build
    configuration. This can be convenient when dealing with many complicated constraint errors, but results may
    be unpredictable.


Plan construction failed.