Misplaced SPECIALIZE instance pragma silently ignored

The user's guide for GHC 7.2.2 says that a SPECIALIZE instance pragma must occur inside the where part of the instance declaration (http://www.haskell.org/ghc/docs/7.2.2/html/users_guide/pragmas.html#specialize-instance-pragma), but it is not checked by GHC 7.2.2 (GHC 7.4.1 RC1 (7.4.0.20111219) correctly yields an error in this situation).

For example, the following code is accepted

data Foo a = MkFoo a

{-# SPECIALIZE instance Eq (Foo Int) #-}
instance (Eq a) => Eq (Foo a) where
  MkFoo a1 == MkFoo a2 = a1 == a2

I don't understand the core code, but using the flags -ddump-simpl-stats and -dppr-debug I see a different output with/without a misplaced SPECIALIZE instance pragma, so I guess the pragma is being silently ignored. Can anyone confirm this please?

Trac metadata

Trac field	Value
Version	7.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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