[Issue 1654] Array concatenation result should be implicitly castable between mutable and immutable if the elements support it.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=1654

--- Comment #35 from Mathias LANG <pro.mathias.lang at gmail.com> ---
*** Issue 12402 has been marked as a duplicate of this issue. ***

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