haddock error in lens 3.3

[peti]

Haddock version 2.10.0 cannot build the documentation:

Preprocessing library lens-3.3...
Haddock coverage:
 100% (  5 /  5) in 'Control.Lens.Isomorphic'
 100% ( 42 / 42) in 'Control.Lens.Internal'
   2% (  1 / 55) in 'Control.Lens.Unsafe'
 100% ( 11 / 11) in 'Control.Lens.Indexed'
 100% (  5 /  5) in 'Control.Lens.IndexedGetter'
 100% (  3 /  3) in 'Control.Lens.Combinators'
 100% ( 13 / 13) in 'Control.Lens.Action'
 100% ( 48 / 48) in 'Control.Lens.Type'
 100% ( 17 / 17) in 'Control.Lens.IndexedLens'
doc comment parse failed:  This is the trivial empty traversal.

 @'ignored' :: 'IndexedTraversal' 'Void' s s a b

 @'ignored' haddock: internal error: <stdout>: commitBuffer: invalid argument (invalid character)

[ekmett]

Merged.