.arcconfig

rust-config: demonstrate a bug when falling back to non-trivial default values

The default value (when the user hasn't configured anything) is not run
through the value parser, causing a programming error to happen because
of type mismatch. This will be fixed in the next commit.

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