Confusing flags for rewrite rules

Functions exported via rewrite rules are incorrectly flagged as "defined but not used" when -Wall is enabled:

module M ({- rules -}) where

eq :: Eq a => a -> a -> Bool
eq = (==)

{-# RULES
    "rule 1" forall x. x == y = y `eq` x
  #-}

Will emit a bogus:

  M.hs:4:0: Warning: Defined but not used: `eq'

Trac metadata

Trac field	Value
Version	6.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	rules, warnings
Operating system	Unknown
Architecture	Unknown