Subtle bug in Data.ByteString and/or GHC (perhaps)

Simon Peyton-Jones simonpj at
Tue Jun 5 03:17:50 EDT 2007

| My guess is that the problem has something to do with unsound rewrite
| rules in Data.ByteString, by the way. Or maybe the problem lies in
| GHC's optimiser.

It'd be nice to know if it's the latter -- someone please yell if so.   GHC's optimiser should never change semantics.


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