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>      That's true, but some discipline can solve that. The usual
> programming style in Scheme is functional, so side-effects are hardly
> an issue.

That is exactly my point. Multiple-shot continuations may be useful for
Scheme (although I haven't seen *convincing* evidence [1]), but not for
Lua, where side effects are the norm.

[1] The existence of several toolkits only shows that the technique
is useful for creating toolkits :) Whether it is useful for real
applications remains unclear.

-- Roberto