LaTeX backend: declNames error

[ugeorge]

When trying to generate LaTeX documentation of a more complex project (i.e. makes use of type classes and type families), Haddock throws the following error and no output is generated:

haddock: internal error: declaration not supported by declNames
CallStack (from HasCallStack):
  error, called at utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs:257:8 in main:Haddock.Backends.LaTeX

Possible cause: at the pointed line declNames throws an error instead of handling the remaining type constructors InstD and DerivD) safely.

Haddock version: 2.16.1
Cabal version: 2.0.0.1
GHC version: 8.2.1

[harpocrates]

Fixed in ae23b4f.