[Issue 13594] std.algorithm.nextPermutation for fixed size arrays too

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13594

--- Comment #2 from bearophile_hugs at eml.cc ---
(In reply to hsteoh from comment #1)
> https://github.com/D-Programming-Language/phobos/pull/2650

This is an improvement. But it's a hack: it still throws away precious
compile-time knowledge of the array length.

--