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Does Zig offer (guaranteed) tail call optimisation?

Where recursion is useful, [...]

Recursion is so useful, most imperative languages even have special syntax constructs very specific special cases of recursion they call 'loops'.

Does Zig offer (guaranteed) tail call optimisation?

Yes[1]. You can use the @call builtin with the .always_tail modifier.

    @call(.always_tail, foo, { arg1, arg2, ... });
[1]: https://ziglang.org/documentation/master/#call
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