template haskell: incorrect Warning: defined but not used
example code:
{-# LANGUAGE TemplateHaskell #-}
module THWarnBug where
import Language.Haskell.TH
mhlt :: Q Type
mhlt = do
let u = [t| String |]
[t| $u |]
compiling gives:
$ ghc -c -Wall THWarnBug.hs
THWarnBug.hs:9:6: Warning: Defined but not used: `u'
but obviously u is used.
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |