On Friday, June 12, 2020 at 1:33:32 PM UTC-4, Ian Lance Taylor wrote: > > On Fri, Jun 12, 2020 at 10:08 AM T L <tapi...@gmail.com <javascript:>> > wrote: > > > > On Friday, June 12, 2020 at 1:02:30 PM UTC-4, Ian Lance Taylor wrote: > >> > >> On Fri, Jun 12, 2020 at 9:56 AM T L <tapi...@gmail.com> wrote: > >> > > >> > Is "uintptr(uintptr(ptr))" a typo? Or are there any other multiple > chained conversions examples? > >> > >> That is not a typo. That is the case that worked in 1.14 and does not > >> work in 1.15. > >> > >> Ian > >> > > > > So "uintptr(unsafe.Pointer(ptr))" also doesn't work now? > > No, that continues to work as before. Nobody has said anything about that > case. > > Again: the case that no longer works is uintptr(uintptr(ptr)). > > Ian > > Get it. Thanks both for the explanations.
> > >> > On Friday, June 12, 2020 at 12:47:03 PM UTC-4, Axel Wagner wrote: > >> >> > >> >> AIUI: The safety rules haven't changed. How the compiler interprets > them has. Previously, it interpreted them so as to allow multiple chained > conversions. Now it doesn't. > >> >> > >> >> On Fri, Jun 12, 2020 at 2:28 PM T L <tapi...@gmail.com> wrote: > >> >>> > >> >>> > >> >>> Package unsafe's safety rules allow converting an unsafe.Pointer > into uintptr when calling certain functions. Previously, in some cases, the > compiler allowed multiple chained conversions (for example, > syscall.Syscall(…, uintptr(uintptr(ptr)), …)). The compiler now requires > exactly one conversion. Code that used multiple conversions should be > updated to satisfy the safety rules. > >> >>> > >> >>> > >> >>> I didn't find the difference from Go 1.14. > >> >>> > >> >>> -- > >> >>> You received this message because you are subscribed to the Google > Groups "golang-nuts" group. > >> >>> To unsubscribe from this group and stop receiving emails from it, > send an email to golan...@googlegroups.com. > >> >>> To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/0f62c576-a1f9-467e-b99c-42f01edaa452o%40googlegroups.com. > > > >> > > >> > -- > >> > You received this message because you are subscribed to the Google > Groups "golang-nuts" group. > >> > To unsubscribe from this group and stop receiving emails from it, > send an email to golan...@googlegroups.com. > >> > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/6139806c-8937-4f71-97a0-eae51fecdb8co%40googlegroups.com. > > > > > > -- > > You received this message because you are subscribed to the Google > Groups "golang-nuts" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to golan...@googlegroups.com <javascript:>. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/12d0fa65-0364-4da1-bf9a-dd6b4cef39e3o%40googlegroups.com. > > > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/d7d3986e-92b5-4748-b9ba-def58f1899d2o%40googlegroups.com.
