System.IntPtr and System.UIntPtr are declared in §C.3 Standard Library Types not defined in ISO/IEC 23271, but they do not have ToString(string) methods there.

Thanks, @KalleOlaviNiemitalo. I'm rethinking this listing of included/excluded members (which I took from the MS spec). §C.2 has declarations for IntPtr and UIntPtr with no members shown. Even though the CLI spec does have members for each, none of those are required by Standard C, so we've omitted them until now. As such, it seems that I should remove the discussion and list of members that are explicitly excluded, as we've never acknowledged their existence previously, and there seems to be no good reason to do so now. (Or is there? See below.)

As for the implicitly included list, if we retain that as proposed, that would require adding those 4 members to C.2 (they are defined in the CLI). If we do that, the 2 methods having parameters need to have a ? suffix added to those parameters .