id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
1124,Panic! The impossible happened: initC srt,guest,,"Hallo,

while compiling this abbreviated program:
{{{
{-# OPTIONS_GHC -farrows -fno-monomorphism-restriction -fglasgow-exts #-}
module Main where
import Control.Arrow

data Pair a b = a :# b

main = undefined

counter = 
  proc x ->
    do t :# _ <- undefined -< x 
       rec (cnt:: Int) <- undefined -< undefined
           undefined -< show cnt
       returnA -< undefined
}}}

the following error occurs:
{{{
> ghc --make play.hs

[1 of 1] Compiling Main             ( play.hs, play.o )
ghc-6.7: panic! (the 'impossible' happened)
  (GHC version 6.7 for i386-unknown-linux):
        initC: srt
}}}
Version infos:
{{{
> gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)

> ghc -V
The Glorious Glasgow Haskell Compilation System, version 6.7
}}}
GHC was build using the repositories from 10 January 2007.

This error seems to be very sensitive to details, I had a hard time condensing the error to the program above. Using flags like -O, -fvia-C didn't help.

You can reach me for questions and help via e-mail: ghc-bug@zeuxis.de

Cheers,
    Harald Holtmann",bug,closed,normal,,Compiler,6.7,duplicate,,,Linux,x86,,Unknown,,,,