.arcconfig

obsolete: don't translate internal error message

AFAIK, it's caught only by "hg debugobsolete", so it's pretty much a
programming error.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}