[Issue 17148] Copying from const(void)[] to void[] breaks immutable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17148

--- Comment #3 from Nick Treleaven <nick at geany.org> ---
> Probably void[] shouldn't be writable

Assuming only slice assignment can write to it, I think we can just disallow
copying from const(void)[]. That's what the pull does.

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