Fatal: Reference is not a tree

[Jan Stolarek]

> Haddock is on Phabricator and has an .arcconfig file. All you need to
> do is submit a revision like normally, just run 'arc diff' in the
> Haddock directory.
But this will create a separate revision for haddock, right? My changes in haddock are related to 
revision I am working on. What I would want to do is somehow have my haddock changes uploaded as 
part of the diff.

> Also, since you have push access to the repository, you can always
> just push your Haddock changes to a branch; for example, commit them
> to 'wip/my-cool-thing' and push that branch publicly. Then point your
> utils/haddock to that SHA1, and 'arc diff'. The rest should work just
> fine when you run 'arc patch' or 'arc diff', or when Harbormaster
> builds it.
Ok, I suppose this will suffice.

Janek