.arcconfig

revlog: reorder a conditionnal about revlogio

if we are using REVLOGV0, we will not use a rust based index. This small line
movement make it clearer.

Differential Revision: https://phab.mercurial-scm.org/D7830

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