DEPRECATED doesn't work for data constructors

[ijones]

In trying to understand the documentation on pragmas I could not figure out where to place a pragma of the form: {-# DEPRECATED f, C, T "Don't use these" #-}

for instance, in Distribution.Setup.hs, I tried to add:

{-# DEPRECATED CopyPrefix "Don't use this." #-}

data CopyDest
  = NoCopyDest
  | CopyTo FilePath
  | CopyPrefix FilePath		-- DEPRECATED
  deriving (Eq, Show)

but got the error:

./Distribution/Setup.hs:172:15:
    Not in scope: type constructor or class `CopyPrefix'

[simonmar]

DEPRECATED can't be used for data constructors in 6.4.1. This has been fixed in the HEAD (see rev. 1.174 of RnSource?.lhs, for example). We might be able to backport the fix; look at before 6.4.2 in any case.

[simonmar]

It's quite a large patch, I'm punting on this for 6.4.2. 6.6 has it, anyway.