I just tried this Google Playground recipe from Bradfritz: https://play.golang.org/p/RYac90kI-H
(seen via https://github.com/golang/go/issues/21095) and noted that y appears in the output but x appears as <nil>. Can someone explain me why ? I was expecting that x appears in the same way like y. package main import ( "fmt" "math" ) var a, b int func main() { type S struct { x int16 y float64 z interface{} p *int } m := map[S]string{} m[S{1, math.NaN(), "foo", &a}] = "x" m[S{2, 3.0, &a, &b}] = "y" for i := 0; i < 20; i++ { fmt.Printf("%+v\n", m) } } //output: map[{x:2 y:3 z:0x1b5400 p:0x1b5404}:y {x:1 y:NaN z:foo p:0x1b5400}:<nil>] map[{x:1 y:NaN z:foo p:0x1b5400}:<nil> {x:2 y:3 z:0x1b5400 p:0x1b5404}:y] -- 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.
