Bugs item #634379, was opened at 2002-11-06 11:41
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Category: Compiler (Type checker)
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Antti-Juhani Kaijanaho (ajk)
Assigned to: Nobody/Anonymous (nobody)
Summary: panic with linear implicit parameters
Initial Comment:
Observe:
$ ghc -fglasgow-exts -c Unique.hs
ghc-5.04: panic! (the `impossible' happened, GHC
version 5.04):
tcSplitTyConApp {%uniqueSupply{-rF4-} ::
Unique.UniqueSupply{-r7-}}
Please report it as a compiler bug to
[EMAIL PROTECTED],
or http://sourceforge.net/projects/ghc/.
----------------------------------------------------------------------
>Comment By: Simon Peyton Jones (simonpj)
Date: 2002-11-07 11:47
Message:
Logged In: YES
user_id=50165
Thanks for this report. There's an obscure bug in lazy pattern
matching for implcit parameters. It'll be fixed in 5.04.2
Meanwhile, instead of
US r = %uniq
say
r = case %uniq of { US r -> r }
----------------------------------------------------------------------
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