.arcconfig

revsetlang: add %p specifier to format list of function arguments

This will be used to construct parameters passed to _matchfiles().

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