#2820: GADT code from RepLib causes panic!
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Reporter: ben.kavanagh | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: normal
Keywords: panic, GADT | Testcase:
Os: Linux | Architecture: x86
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While compiling RepLib generics library I encountered a ghc panic. I have
isolated the failure to very small example that does some simple
computation over a heterogenous list. I have attached the following files
RepMinimal.hs. This is the problem reduced to small example. The function
that seems to cause the problem is "badFunction". If I remove this
function the file compiles.
RepSmall.hs. This is a trimmed down core of RepLib where the original
problem occurs. I only include it if someone looking at the bug wants to
know what this code was used for.
below is the output of ghc run.
----------------------
[EMAIL PROTECTED] RepLib]$ ghc -v RepCombined3.hs
Glasgow Haskell Compiler, Version 6.10.1, for Haskell 98, stage 2 booted
by GHC version 6.10.1
Using package config file: /usr/lib/ghc-6.10.1/./package.conf
hiding package base-3.0.3.0 to avoid conflict with later version
base-4.0.0.0
wired-in package ghc-prim mapped to ghc-prim-0.1.0.0
wired-in package integer mapped to integer-0.1.0.0
wired-in package base mapped to base-4.0.0.0
wired-in package rts mapped to rts-1.0
wired-in package haskell98 mapped to haskell98-1.0.1.0
wired-in package syb mapped to syb-0.1.0.0
wired-in package template-haskell mapped to template-haskell-2.3.0.0
wired-in package dph-seq mapped to dph-seq-0.3
wired-in package dph-par mapped to dph-par-0.3
Hsc static flags: -static
Created temporary directory: /tmp/ghc3284_0
*** Checking old interface for main:Data.RepLib.RepCombined:
*** Parser:
*** Renamer/typechecker:
*** Desugar:
Result size = 176
*** Simplify:
Result size = 283
Result size = 283
*** Tidy Core:
Result size = 283
*** CorePrep:
Result size = 465
*** Stg2Stg:
*** CodeGen:
*** CodeOutput:
*** Deleting temp files:
Deleting: /tmp/ghc3284_0/ghc3284_0.s
*** Deleting temp dirs:
Deleting: /tmp/ghc3284_0
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-unknown-linux):
initC: srt_lbl
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2820>
GHC <http://www.haskell.org/ghc/>
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