Hi devs, A coworker is experiencing sporadic failures when reloading our project in GHCi, with ``` ghc: internal error: scavenge_one: strange object 23 (GHC version 8.6.5 for x86_64_unknown_linux) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug cabal: repl failed for mercury-web-backend-0.0.0. The build process terminated with exit code -6 ``` upon a quick inspection it seems that scavenge_one inspects the type of the object, but has no case for BCO (which is 23). I'm guessing there's something weird going on here since this doesn't happen deterministically. I don't have a good intuition for how this scavenging should work for BCO's, or if it should even be possible for BCO's to appear here (i.e. this is a symptom of some other bug). Any thoughts? Thanks