You have "n+1", so it's calling fib 3, fib 4, fib 5, ... forever
Doh!
Sure enough just type in the right function and it works. I must have made the same mistake several times.
1 2 3 4 5
let rec fib n = match n with | 0 -> 0 | 1 -> 1 | _ -> fib (n - 1) + fib (n - 2);;
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Just starting to seriously learn F#, and I've noticed in the FSI any recursive function that does not do tail recursion blows up on even a very small number of recurses.
What gives?