Consider the following methods (fiddle): void test(Span<int> param) { //Fail, the stackalloc'ed buffer could be exposed. param = stackalloc int[10]; } void test2(Span<int> param) { ...

C# 7.2 introduced ref structs. However, given a ref struct like this: public ref struct Foo { public int Bar; } I cannot use it as a type argument: int i = 0; var x = Unsafe.As<int, Foo>(re...