You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: example_test.go
    path of file: ./repos/go-ethereum/event
    
    the code of the file until where you have to start completion: // Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
/
    
func ExampleTypeMux() {
	type someEvent struct{ I int }
	type otherEvent struct{ S string }
	type yetAnotherEvent struct{ X, Y int }

	var mux TypeMux

	// Start a subscriber.
	done := make(chan struct{})
	sub := mux.Subscribe(someEvent{}, otherEvent{})
	go func() {
		for event := range sub.Chan() {
			fmt.Printf("Received: %#v\n", event.Data)
		}
		fmt.Println("done")
		close(done)
	}()

	// Post some events.
	mux.Post(someEvent{5})
	mux.Post(yetAnotherEvent{X: 3, Y: 4})
	mux.Post(someEvent{6})
	mux.Post(otherEvent{"whoa"})

	// Stop closes all subscription channels.
	// The subscriber goroutine will print "done"
	// and exit.
	mux.Stop()

	// Wait for subscriber to return.
	<-done

	// Output:
	// Received: event.someEvent{I:5}
	// Received: event.someEvent{I:6}
	// Received: event.otherEvent{S:"whoa"}
	// done
}