#7336: Defined but not used is not detected for data types with instances
------------------------------+---------------------------------------------
Reporter: maeder | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.6.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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{{{
module Unused () where
data U = U deriving Show
}}}
does _not_ report
{{{
Unused.hs:3:6: Warning:
Defined but not used: type constructor or class `U'
Unused.hs:3:10: Warning: Defined but not used: data constructor `U'
}}}
This message is only displayed without "deriving".
I know, instances are always exported, but these instances cannot be used.
Considering that all types may get Typeable instances, no unused warning
would ever be issued for data types.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7336>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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