Hi all, Today I picked up an old worktree that hadn't seen much action for a couple months and tried to get the developer environment running again. I believe I ran into issues in Cabal, Hadrian, and/or ghc.nix that may be interesting to some. I wrote up the event log here: https://gitlab.haskell.org/snippets/1475 It all ends well; I am now successfully running hadrian/ghci.sh via ghcid within the ghc.nix shell once again. :) -Bryan P.S.: I believe Shayne recommended using the devel2 build flavor for most kinds of work. At Zurihac I ended up rebuilding the whole tree a couple times because that flavor isn't the default (once for Make, once for Hadrian). I will not in any way suggest changing the defaults, but perhaps some script or other could prompt the user to make their choice, if they haven't already?