Proposal: Improved error message of "Error in array index"

[Simon Marlow]

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

> Simon Marlow wrote:
> 
>> 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.

Cheers,
	Simon