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For a functionnal language, TCO is really a must have. How would you do the equivalent of loops without it ?

For a purely functional language. Scheme is not that.

And you are wrong because you can define a loop as iterating recursively over a list with just car and cdr.

Can but since other constructs exist that doesn't by itself make TCO "must have"

I wasn't asking which scheme has TCO.

I was asking which scheme if the 20-50 of them was "lightweight" and embeddable.