#3820: Pragma for suppressing 'orphan instance' warnings per instance
---------------------------------+------------------------------------------
Reporter: guest | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler (Type checker)
Version: 6.12.1 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Additionally to #2515 I'd like to suppress orphan instances warnings
individually. I do not always like to disable orphan instance warnings
globally for a module, since some of the warnings may point to an instance
that can actually be moved to a more appropriate module.
Syntax could be
{{{
{-# NOWARN orphan #-}
instance C T where
...
}}}
or simply
{{{
{-# NOWARN #-}
instance C T where
...
}}}
(Before GHC-6.12 a general local NOWARN pragma could also help to minimize
wrong warnings about unused imported modules. And sometimes I also like to
disable 'unused identifier' warning for some top-level functions, that
shall be type checked, but not exported, because their API is still not
mature.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3820>
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The Glasgow Haskell Compiler
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