[Issue 12404] Zip.back is wrong

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12404


Peter Alexander <peter.alexander.au at gmail.com> changed:

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--- Comment #1 from Peter Alexander <peter.alexander.au at gmail.com> 2014-03-19 16:23:52 PDT ---
Urgh, fixing this is going to be a breaking change, but not necessarily fix
bugs.

assert(zip("abc", "123").back == tuple('c', '3'));

That's correct, and works, but your fix requires length and indexing, which
narrow strings don't have.

If indexing and length aren't available, back should assert if the stopping
policy is not requireSameLength.

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