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{-# LANGUAGE TemplateHaskell #-}
{-
This is to test that we don't get the error:
The exact Name ‘x_aFi’ is not in scope
Probable cause: you used a unique Template Haskell name (NameU),
perhaps via newName, but did not bind it
If that's it, then -ddump-splices might be useful
When looking up something with 'lookupGlobalOccRn_maybe', which is called by
'lookupThName'. This can happen when using a gensymmed name via newName.
This should still fail to compile though, as reify should complain that "x"
isn't in the type environment, albeit with one less error.
Later (March 2021): actually this should really compile fine:
* The [d| ... |] splices in a top-level binding for x
* The reify looks for that binding
It was really a bug that it didn't work, now fixed.
-}
module T18263 where
import Language.Haskell.TH
import Language.Haskell.TH.Syntax
import System.IO
do
n <- newName "x"
addModFinalizer $ reify n >>= runIO . hPrint stderr
[d| $(varP n) = 42 |]
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