Incorrect warnings for SOURCE pragmas

[nad]

Consider the following files:

A.hs-boot:

module A where

x :: a

A.hs:

module A where

import B

x = y

B.hs:

module B where

import {-# SOURCE #-} A

y = x

The SOURCE pragma is clearly necessary (GHC 6.8.3 does not warn about it), but Haddock (both 2.1.0 and the most recent darcs version) gives a warning:

$ haddock A.hs B.hs

B.hs:3:0:
    Warning: Unnecessary {-# SOURCE #-} in the import of module `A'

This is quite annoying, since our project relies on -Wall -Werror, cabal haddock reuses the GHC options from the Cabal file, and there is no flag for turning off just the given warning.

This may be related to http://hackage.haskell.org/trac/ghc/ticket/1833, by the way.

[nad]

This bug appears to have been fixed in Haddock 2.3.0 which ships with GHC 6.10.1.