The existing implementation generates uncompilable objc code for functions returning two results. Change-Id: I13f7329596d8fa6103c4b7827c26c5461e16a925 Reviewed-on: https://go-review.googlesource.com/11364 Reviewed-by: David Crawshaw <crawshaw@golang.org> Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>