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

[Olaf Chitil]

Simon Marlow wrote:

>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"
>  
>
So cost-centre stacks are not produced for the original program written 
by the user, but for the intermediate program after optimisation. I 
understand that you want to profile the optimised version, but the fact 
that your profile does not quite match your program can be confusing. 
For debugging, however, I think that it is clear that you want your 
debugging information (cost centre stacks) to match your program, even 
if it costs you some performance.

Ciao,
Olaf