Phabricator builds with haddock changes fail

[Alan & Kim Zimmerman]

It seems that phabricator is not picking up haddock commits for builds.

I rebased my D538 diff, with matching haddock submodule

  Subproject commit 54c5e7cd0b5844712301cacc826a6b112dbc1090

However, the build fails with an error in haddock which is explictly
patched in the haddock repo.

Up until last week this process worked fine, and was recently recommended
on this mailing list.

Has something changed now that it is a RC?

Failing build:
https://phabricator.haskell.org/harbormaster/build/2762/

Changed line in haddock branch
https://github.com/haskell/haddock/commit/54c5e7cd0b5844712301cacc826a6b112dbc1090#diff-d1a2c44392a66d2e7a0c9706a8ef6186R107

Regards
  Alan
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