Template Haskell should warn when it encounters an unencodable pragma

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.

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Template Haskell
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture