extern (C) int printf(in char*, ...) @nogc nothrow;

​

void myAssert(bool cond, string delegate() @nogc nothrow[1] msg ...) @nogc nothrow

{

    msg[0]();

}

​

string param() @nogc nothrow

{

    printf("bar\n");

    return "foo";

}

​

void main() @nogc nothrow

{

    myAssert(false, param());

}