Seems like arbtt somehow switched to a newer terminal-progress-bar even though bytestring-progress depends on an earlier version of that library:
I've tried shuffling those dependencies around in various ways but have so far been unable to build using stack.
Here's the output I get:
```$ stack build
Error: While constructing the build plan, the following exceptions were encountered:
In the dependencies for arbtt-0.10.2: terminal-progress-bar-0.2 from stack configuration does not match >=0.4 && <0.5 (latest matching version is 0.4.0.1) needed since arbtt is a build target.
Some different approaches to resolving this:
Set 'allow-newer: true' in /home/john/.stack/config.yaml to ignore all version constraints and build anyway.
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.
Recommended action: try adding the following to your extra-deps in /home/john/dev/arbtt/stack.yaml:
Plan construction failed. ```