How to avoid stack space overflows?

Question

I\'ve been a bit surprised by GHC throwing stack overflows if I\'d need to get value of large list containing memory intensive elements. I did expected GHC has TCO so I\'ll neve

Answer 1

All of the definitions (except the useless fib_at) will delay all the + operations, which means that when you have selected the millionth element it is a thunk with a million delayed additions. You should try something stricter.