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compiled program segfaults

The enclosed program segfaults on the enclosed input, like

$ ./dissect <res.txt
[Sensible output]
Segmentation fault

This is with default compilation: ghc dissect.hs -o dissect
With optimalization enabled (ghc -O dissect.hs -o dissect) the same 
error does not happen.

This happens on Debian Woody, ghc apt-got from
deb http://www.syntaxpolice.org/haskell-experimental/ stable/
Linux kernel 2.4.20, libc 2.2.5-11.5
Trac metadata
Trac field Value
Version 6.0.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution ResolvedDuplicate
Component None
Test case
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