#7532: -ddump-splices output doesn't match generated code for data instances
inside instances.
-----------------------------+----------------------------------------------
Reporter: Aninhumer | Owner:
Type: bug | Status: new
Priority: normal | Component: Template Haskell
Version: 7.6.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Blockedby:
Blocking: | Related:
-----------------------------+----------------------------------------------
Using the following code:
{{{
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
module Test where
import Language.Haskell.TH
class C a where
data D a
bang :: DecsQ
bang = return [
InstanceD [] (AppT (ConT ''C) (ConT ''Int)) [
DataInstD [] ''D [ConT ''Int] [
NormalC (mkName "T") []] []]]
}}}
{{{
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
import Language.Haskell.TH
import Test
$(bang)
}}}
When compiling the second file in GHCi with -ddump-splices set, the output
is:
{{{
th-test2.hs:1:1: Splicing declarations
bang
======>
th-test2.hs:9:3-6
instance C Int where
data instance D Int = T
Ok, modules loaded: Test, Main.
}}}
This compiles successfully, but the dumped splice is clearly incorrect
(which I confirmed by attempting to splice this code manually into the
same place).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7532>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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