Haddock not obeying ignore-exports correctly

Question

Take this example:

{-# OPTIONS_HADDOCK ignore-exports #-}
module HaddockTest (e1) where

-- * Exported

-- | This is exported.
e1 :: Int
e1 = 1

-- * Private

-- | This is not exported.
p1 :: Int
p1 = 1

Strangely, the doc-string for the non-exported declaration is ignored, even though we get the structure otherwise correctly:

Does anyone have a clue? For the record, invoking via cabal haddock --internal doesn't help, nor does haddock --ignore-all-exports.

Answer 1

It's a bug in haddock-2.10, reported in March and fixed soon after, but the haddock shipped with GHC-7.4.1 was affected. Presumably the haddock shipped with 7.4.2 includes the fix (haven't built 7.4.2 yet).