I have opened an issue with the same request a while ago: https://github.com/haskell/haddock/issues/472

2016-10-28 10:38 GMT+02:00 Tom Ellis <tom-lists-haskell-cafe-2013@jaguarpaw.co.uk>:
Some of my type signatures have long contexts and Haddock doesn't wrap them,
pushing the more interesting information off the right hand side, e.g.:

    https://hackage.haskell.org/package/opaleye-0.5.1.1/docs/Opaleye-Join.html

Is there any way I can convince Haddock to wrap these contexts?  Ideally I
want to see something like

    leftJoin
        :: (Default Unpackspec columnsA columnsA,
            Default Unpackspec columnsB columnsB,
            Default NullMaker columnsB nullableColumnsB)
        => Query columnsA
        -> Query columnsB
        -> ((columnsA, columnsB) -> Column PGBool)
        -> Query (columnsA, nullableColumnsB)

Thanks,

Tom
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