Special Type Challenge

[Meta via Digitalmars-d]

On Sunday, 8 February 2015 at 13:06:08 UTC, Marc Schütz wrote:
> No, `alias this` convert from the type it is declared in to 
> another type. `opImplicitCast` would be declared in the 
> destination type.

So like this?

struct Type1
{
     string str;
}

struct Type2
{
     string str;

     Type2 opImplicitCast(Type1 t)
     {
         return Type2(t.str);
     }
}

void main()
{
     Type2 t2 = Type1("Hello, World!");
}

Instead of the opposite?