https://golang.org/ref/spec#Comparison_operators > Pointers to distinct zero-size variables may or may not be equal.
Looks like a more complicated example of https://github.com/golang/go/issues/8938. On Friday, January 6, 2017 at 2:24:39 AM UTC-8, Ignazio Di Napoli wrote: > > I'm very curious about the answer to this unanswered StackOverflow > question: > http://stackoverflow.com/questions/41357948/what-golang-compiler-will-do-when-fmt-println > > > import ( > "fmt") > > type shout interface { > echo()} > > type a struct {} > func (*a) echo () { > fmt.Println("a")} > > type b struct {} > func (*b) echo () { > fmt.Println("b")} > > func compare(a, b shout) { > //fmt.Println(&a, &b) > if a == b { > fmt.Println("same") > } else { > fmt.Println("not same") > }} > > func main() { > a1 := &a{} > b1 := &b{} > a2 := &a{} > a1.echo() > b1.echo() > compare(a1, b1) > compare(a1, a2) > compare(a1, a1) } > > > The output is different if a fmt.Println is commented or not. > > Commented: > > not samenot same > same > > > Not commented: > > 0x1040a120 0x1040a128not same0x1040a140 0x1040a148 > same0x1040a158 0x1040a160 > same > > > > To me, it seems a compiler bug, or some undefined behaviour. > Can someone help me understand? > > > Thank you. > > > > -- 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. For more options, visit https://groups.google.com/d/optout.
