elaforge

. It would be nice to include guidance on how to pick a nixpkgs commit.
I went to github and picked the latest from nixos-19.09.  Then how do we know
which version of ghc it has?  I did `nix repl` then `n = import nixpkgs.nix {}`
then use n.<tab> to see what's inside, but that's clumsy.  Surely there's some
better way?

. I used `fetchTarball` to get nixpkgs, not `fetchGit`.  fetchGit locked up my
laptop... probably it's just slower and nixpkgs is repo.

. I have to pass --option max-jobs 4 (less than default of 32) or it kills the

elaforge

module Util.Debug (
    -- * forced by evaluation
    trace, tracep, traces, traceps
    , tracef, trace_ret
    -- * forced by monad
    , traceM, tracepM, tracesM
    -- in IO
    , puts, put, putp
) where
import qualified Control.Monad.Trans as Trans