[Issue 18580] std.conv.to!(ubyte[])(void[]) should work

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18580

--- Comment #5 from Jack Stouffer <jack at jackstouffer.com> ---
(In reply to ag0aep6g from comment #4)
> (In reply to Jack Stouffer from comment #3)
> > Is it unsafe though? In this specific case of void[] to ubyte[] (or vise
> > versa) isn't it ok?
> 
> void[] to ubyte[] is unsafe, because anything converts to void[]:
> 
> ----
> void f(int*[] p)
> {
>     void[] v = p; /* This is considered @safe. Don't even need a cast. */
>     ubyte[] b = cast(ubyte[]) v; /* Just as unsafe as `cast(ubyte[]) p`. */
>     b[0] = 123; /* Messing with pointers like this is not safe. */
> }
> ----

Well the argument there is that the conversion from p to v should be unsafe,
but not the conversion of v to b.

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