[ ghc-Bugs-860413 ] ghci TH symbol lookup fails if package not already loaded

Bugs item #860413, was opened at 2003-12-15 15:50
Message generated for change (Comment added) made by simonpj
You can respond by visiting: 
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Category: Compiler
Group: 6.0.1
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Duncan Coutts (duncan_coutts)
Assigned to: Nobody/Anonymous (nobody)
Summary: ghci TH symbol lookup fails if package not already loaded

Initial Comment:
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@xxxxxxxxxxx,
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).

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>Comment By: Simon Peyton Jones (simonpj)
Date: 2003-12-19 12:12

Message:
Logged In: YES 
user_id=50165

This is indeed a bug in 6.2.

But it works ok in the HEAD; and I'm not going to fix the 
branch.  

Simon

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