Ref T13546. Update the Mercurial code which finds default targets and maps symbols to targets under "arc land" to use the new MarkerRef workflow.
- Maniphest Tasks
- T13546: Modernize the "arc land" workflow
- rARC5abf0b96c8d9: Use MarkerRefs to resolve landing symbols in Mercurial
Ran "arc land" with (and without) various arguments in Mercurial, saw them resolve in a seemingly sensible way.