GHC lazy eval optimization bug

Chris Kuklewicz haskell at
Sun Feb 3 15:10:34 EST 2008

I can confirm this performance bug with GHC version 6.6.1 on OS X PCC (G4) Leopard.

It performs correctly, lazily keeping 'primes' for all 4 repetitions, when using 
"ghc -Onot" but the the doSlow fails to retain 'primes' when compiling with "ghc 
-O" and "ghc -O2"


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