[Issue 13122] std.algorithm.cartesianProduct output type immutability

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13122

--- Comment #3 from bearophile_hugs at eml.cc ---
(In reply to hsteoh from comment #1)
> Hmm. Isn't this expected behaviour?

Probably yes, but I have opened a discussion thread:
http://forum.dlang.org/thread/fxkgafwqeeduxkerzglo@forum.dlang.org

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