import std.stdio, std.typecons;

​

struct Foo

{

    Nullable!(char[2]) value; // static char array is prerequisite

}

​

struct Bar

{

    Nullable!Foo foo;

}

​

void main(string[] args)

{

    Bar bar;

    writeln(bar);

    bar.foo = Foo();

    // if uncomment one of the two following

    // lines it works correctly

    // Does it mean that Nullable!Foo isn't

    // correctly initialized and is in intermediate state

    // between null and not null?

    //bar.foo.value = "12";

    //bar.foo.nullify;

    writeln(bar.foo.isNull); // not null

    writeln(bar.foo); // runtime-error

}