On 09 November 2005 11:40, Simon Marlow wrote:

On 09 November 2005 10:18, Ketil Malde wrote:

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Simon Marlow wrote:

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Hmm yes, this is indeed rather unhelpful. I can explain why it happens, though. The compiler has lifted out the error case into a top-level binding:

x = error "Error in array index"

Would the compiler be less agressive with this if I turn off optimization? I usually use optimization with profiling as well, but could of course turn it off if it would result in more useful stack backtraces.

Possible... but not guaranteed. I think the simplifier does limited forms of let-floating even without -O.

Oh, and that code is in a library, so turning off -O won't help there. Cheers, Simon