[Issue 24582] Detect unsafe `cast(bool[])`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24582

--- Comment #3 from Nick Treleaven <nick at geany.org> ---
    bool v = cast(bool) 2;

    ubyte[] a = [2, 4];
    auto b = cast(bool[]) a;
    auto c = cast(bool[]) [2, 4]; // literal cast

    import std.stdio;
    writeln(*cast(byte*)&v); // 1, OK
    writeln(*cast(byte*)b.ptr); // 2, unsafe
    writeln(*cast(byte*)c.ptr); // 1, OK

So only the runtime array cast is unsafe.

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