Use Point instead of IntStruct

Author: titsuki

doc/Language/nativecall.pod6

@@ -291,15 +291,15 @@ members:
     class MyStruct is repr('CStruct') {
         has CArray[num64] $!arr;
         has Str $!str;
-        has IntStruct $!int-struct;
+        has Point $!point; # Point is a user-defined class
 
         submethod TWEAK {
             my $arr := CArray[num64].new;
             $arr[0] = 0.9e0;
             $arr[1] = 0.2e0;
             $!arr := $arr;
             $!str := 'Perl 6 is fun';
-            $!int-struct := IntStruct.new;
+            $!point := Point.new;
         }
     }