improve proxy

exp/funint/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+	"net"
+)
+
+type Foo interface {
+	Bar()
+}
+
+func bar() {
+	fmt.Println("bar")
+}
+
+func run(f Foo) {
+	f.Bar()
+}
+
+type t struct {
+	Bar func()
+}
+
+type t2 struct {
+}
+
+func (t t2) Bar() {
+	bar()
+}
+
+func main() {
+	run(t2{})
+	var d net.Dialer
+	d.Cancel
+}