[Issue 20943] std.algorithm.setops.cartesianProduct fails for ranges with @system popFront

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20943

--- Comment #3 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/phobos pull request #7541 "merge stable" was merged into master:

- b8e90f4a227edbfce52ace5e597e039cf56c03c0 by John Colvin:
  Fix Issue 20943 - std.algorithm.setops.cartesianProduct fails for ranges with
@system popFront (#7519)

  Let safety of cartesianProduct.Result.popFront be inferred.

https://github.com/dlang/phobos/pull/7541

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