import std.stdio;

​

interface I

{

    void foo();

}

class C : I {

    void foo() {writeln("C");}

    void bar() {writeln("C bar");}

}

​

C[] getInstance()

{

    return [new C, new C];

}

​

void main()

{

C[] carray = getInstance();

//I[] iarray = carray; // compile error

I[] iarray = cast(I[])carray; // runtime error (1)

    iarray[0].foo();

​

}