[GHC] #9084: Template Haskell should warn when it encounters an unencodable pragma
GHC
ghc-devs at haskell.org
Wed May 7 15:40:31 UTC 2014
#9084: Template Haskell should warn when it encounters an unencodable pragma
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Reporter: goldfire | Owner: goldfire
Type: bug | Status: new
Priority: normal | Milestone:
Component: Template Haskell | Version: 7.8.2
Keywords: | Operating System: Unknown/Multiple
Architecture: Unknown/Multiple | Type of failure: None/Unknown
Difficulty: Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: |
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When I say this
{{{
{-# LANGUAGE TemplateHaskell #-}
{-# OPTIONS_GHC -Wall #-}
module Bug where
$([d|
class C a where
meth :: a -> a
meth = undefined -- give a (silly) default
{-# MINIMAL meth #-}
|])
instance C Int
}}}
I get no warnings. I'm not surprised that TH doesn't handle every pragma
that GHC knows about, but it should issue a (suppressable) warning when it
discards one.
I can fix this one.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9084>
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