[GHC] #1323: crash when zipping two lists of the same length...

[GHC]

#1323: crash when zipping two lists of the same length...
------------------------------------+---------------------------------------
  Reporter:  matthew at wellquite.org  |          Owner:                
      Type:  bug                    |         Status:  new           
  Priority:  normal                 |      Milestone:                
 Component:  Compiler               |        Version:  6.6           
  Severity:  normal                 |       Keywords:                
Difficulty:  Unknown                |             Os:  Linux         
  Testcase:                         |   Architecture:  x86_64 (amd64)
------------------------------------+---------------------------------------
I've personally not checked this against 6.6.1, but "mauke" on #haskell
 says the same crash and same line number appears in the crash report.

 $ ghc --version
 The Glorious Glasgow Haskell Compilation System, version 6.6

 $ ghc -v --make Session.hs
 Glasgow Haskell Compiler, Version 6.6, for Haskell 98, compiled by GHC
 version 6.6
 Using package config file: /usr/lib/ghc-6.6/package.conf
 hiding package hinstaller-2007.4.21 to avoid conflict with later version
 hinstaller-2007.4.24
 wired-in package base mapped to base-2.0
 wired-in package rts mapped to rts-1.0
 wired-in package haskell98 mapped to haskell98-1.0
 wired-in package template-haskell mapped to template-haskell-2.0
 Hsc static flags: -static
 *** Chasing dependencies:
 Chasing modules from: Session.hs
 Stable obj: []
 Stable BCO: []
 compile: input file Session.hs
 Created temporary directory: /tmp/ghc4588_0
 *** Checking old interface for main:Main:
 [1 of 1] Compiling Main             ( Session.hs, Session.o )
 *** Parser:
 *** Renamer/typechecker:
 *** Desugar:
     Result size = 379
 *** Simplify:
 *** Deleting temp files:
 Deleting: /tmp/ghc4588_0/ghc4588_0.s
 Warning: deleting non-existent /tmp/ghc4588_0/ghc4588_0.s
 *** Deleting temp dirs:
 Deleting: /tmp/ghc4588_0
 ghc-6.6: panic! (the 'impossible' happened)
   (GHC version 6.6 for x86_64-unknown-linux):
         Pattern match failure in do expression at
 simplCore/Simplify.lhs:1540:8-21

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 Now as the comments in the source say, it works fine if you replace
 newtype with data, and I am aware that there are differences in what they
 do, though I can never quite remember the fine details. So it's quite
 possibly my fault, but an error message other than a GHC crash would be
 nicer!

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1323>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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