Adjust some more code that was depending on the function and delegate calling conventions being equal. There's also an instance in `tango.text.convert.Layout` that should be adjusted: {{{ Index: tango/text/convert/Layout.d =================================================================== --- tango/text/convert/Layout.d (revision 4578) +++ tango/text/convert/Layout.d (working copy) -660,8 +660,12 @@ case TypeCode.STRUCT: auto s = cast(TypeInfo_Struct) type; - if (s.xtoString) - return Utf.fromString8 (s.xtoString(p), result); + if (s.xtoString) { + char[] delegate() toString; + toString.ptr = p; + toString.funcptr = cast(char[] function()) s.xtoString; + return Utf.fromString8 (toString(), result); + } goto default; case TypeCode.INTERFACE: }}}

interface MyInterface
{
    int func();
}

class MyClass : MyInterface
{
    int var;
    int func()
    {
        return var;
    }
}

void func1(MyInterface i)
{
    int delegate() dg = &i.func;
    func2(dg);
}

extern(C) int printf(char*, ...);

void func2(int delegate() dg)
{
    int i = dg();
    printf("%d\n", i);
}

void main()
{
    auto c = new MyClass;
    c.var = 42;
    func1(c);
}