"Defined but not used" for variable used in Template Haskell splice

I encountered this warning on valid code using Template Haskell ; I had to change "name" to "_name" to make it compile warning-free.

Test case:

{-# LANGUAGE FlexibleInstances, TemplateHaskell #-}
import Language.Haskell.TH

main :: IO ()
main = do
    let name = mkName "name"
    decl <- runQ [d| instance Show $(conT name) where show = undefined |]
    print decl

Warnings:

TestCase.hs:6:8: Warning: Defined but not used: `name'

I found ticket #3873 (closed), but I don't know if it represents the same bug.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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