commitAndReleaseBuffer: invalid argument (invalid character)

[nodew]

━━━ Check.Functor ━━━
  koan-test.exe: <stdout>: commitAndReleaseBuffer: invalid argument (invalid character)
  ○ 0/5 complete (running)
Completed 2 action(s).
Test suite failure for package hw-koans-0.1.0.0
    koan-test:  exited with: ExitFailure 1
Logs printed to console

https://github.com/haskell-works/hw-koans.git

when I run test with this project. I get this error commitAndReleaseBuffer: invalid argument (invalid character)
platform: windows10 powershell
ghc: 8.0.2

unfortunately, I don't have a linux machine or mac nearby, so I'm not sure whether the problem is caused by windows 10 or not.

[moodmosaic]

This is probably related to #32, and perhaps #110 too. As per this comment, you may try these:

hSetEncoding stdout utf8
hSetEncoding stderr utf8