Inside of D’s GC in Russian

[Kagamin]

One time I wanted `inout` in C#, that uses wrapper types for 
slices. How would you design it without `inout`?

```
Span<T> Shrink<T>(Span<T> s, int length)
{
	if (s.Length > length) return s.Slice(0, length);
	return s;
}

ReadOnlySpan<T> Shrink<T>(ReadOnlySpan<T> s, int length)
{
	if (s.Length > length) return s.Slice(0, length);
	return s;
}

void test(byte[] a)
{
	//var b = Shrink(a, 2); //can't infer type
	var b2 = Shrink<byte>(a, 2);
}