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: }}}

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

class A
{
    int i = 42;
    double df = 3.1415;
    this()
    {
    }
    char[] toString()
    {
        return "A:Object";
    }
}

class B : A
{
    ubyte b;
    char[] toString()
    {
        return "B:A";
    }
}

void main()
{
    scope a = new A;
    char[] as = a.toString;
    {printf("a.toString = '%.*s'\n", as.length, as.ptr);}

    Object o = a;
    char[] os = o.toString;
    {printf("o.toString = '%.*s'\n", os.length, os.ptr);}

    scope b = new B;
    char[] bs = b.toString;
    {printf("b.toString = '%.*s'\n", bs.length, bs.ptr);}
}