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package main
import "fmt"
type (
empty struct{}
t interface{}
set map[t]empty
)
func main() {
m := make(map[t]string)
fmt.Println(fmt.Sprintf("%+v", m))
m[struct{ x string }{x: "hello there"}] = "hello there"
fmt.Println(fmt.Sprintf("%+v", m))
m[struct{ x string }{x: "hello there"}] = "goodbye"
fmt.Println(fmt.Sprintf("%+v", m))
ptr := &struct{ x string }{x: "hello there"}
pv := *ptr
m[pv] = "ptr"
fmt.Println(fmt.Sprintf("%+v", m))
}
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