Thanks for your pull request and interest in making D better, @FeepingCreature! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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Though, BTW, a more fundamental problem here is how variadic cartesianProduct is implemented. The current implementation for infinite ranges causes an exponential number of template expansions, which will quickly cause system RAM to run out as the number of arguments grow. There ought to be a way of implementing it such that it's less template-heavy.