Then you can do:

  deco start dmd-repl
  socat unix-connect:/var/run/dmd/repl stdio

and tinker from there.  New ways to cra^W experiment with your system!

I’m tempted to just commit that.  There are shortcomings: (1) the REPL
server runs in a thread and threads + fork don’t go together well
(although in practice dmd only does fork followed by exec, so it’s OK),
and (2) for some reason ‘stop-server-and-clients!’ seems to leave open
sockets behind it, so if you restart the REPL on the same socket, it
fails with EADDRINUSE.

Thoughts?

Ludo’.