[Issue 20848] Bug in Nullable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20848

--- Comment #2 from Victor Porton <porton at narod.ru> ---
The error is here (format.d from phobos):

private void formatValueImpl(Writer, T, Char)(auto ref Writer w, T obj, scope
const ref FormatSpec!Char f)
if (is(DynamicArrayTypeOf!T) && !is(StringTypeOf!T) && !is(T == enum) &&
!hasToString!(T, Char))
{
    static if (is(const(ArrayTypeOf!T) == const(void[])))
    {
        formatValueImpl(w, cast(const ubyte[]) obj, f);
    }
    else static if (!isInputRange!T)
    {
        alias U = Unqual!(ArrayTypeOf!T);
        static assert(isInputRange!U, U.stringof ~ " must be an InputRange");
        U val = obj;
        formatValueImpl(w, val, f);
    }
    else
    {
        formatRange(w, obj, f);
    }
}

In the above code the type immutable(void)[] is forgotten to be considered.
Somebody, please fix it.

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