DEPRECATED doesn't work for data constructors

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'

Trac metadata

Trac field	Value
Version	6.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Documentation
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Operating system	Unknown
Architecture	Unknown