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 | |
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