Add revlog.LookupError exception, and use it instead of RevlogError.
Remove repo.LookupError, which devolves to the revlog version.
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
adding b
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
adding b