ghci TH symbol lookup fails if package not already loaded

in ghci -fglasgow-exts,

if I type:
> :t $( [| Language.Haskell.THSyntax.app |] )
ghc-6.0.1: panic! (the `impossible' happened, GHC
version 6.0.1):
        Desugar: lookup:
LanguageziHaskellziTHSyntax.var {- v 03F -}
 
Please report it as a compiler bug to
glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.

This is even if the module I had loaded imported
Language.Haskell.THSyntax

On the other hand doing
> $( [| Language.Haskell.THSyntax.app |] )
works find (it links in haskell-src). Then after that,
doing
> :t $( [| Language.Haskell.THSyntax.app |] )
works fine too.

The problem seems to be that the :t command doesn't
trigger on-demand package loading (at least in
combination with TH).

I got this problem on ghc 6.0.1 and a cvs version that
claimed it was 6.1 (built in mid spetember).

Trac metadata

Trac field	Value
Version	6.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	ResolvedFixed
Component	Compiler
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