Nested closure solution to Equivalent Binary Tree Walk method

exercises/08-ebt/go.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"code.google.com/p/go-tour/tree"
+	"fmt"
+)
+
+// Walk walks the tree t sending all values
+// from the tree to the channel ch.
+func Walk(t *tree.Tree, ch chan int) {
+    // do it as a nested closure so that I can control the call to close so 
+    // that I can use the range-based forloop in main.main
+	var walk func(t *tree.Tree)
+	walk = func(t *tree.Tree) {
+		if t == nil {
+			return
+		}
+		walk(t.Left)
+		ch <- t.Value
+		walk(t.Right)
+	}
+	walk(t)
+	close(ch)
+}
+
+// Same determines whether the trees
+// t1 and t2 contain the same values.
+func Same(t1, t2 *tree.Tree) bool
+
+func main() {
+	t := tree.New(1)
+	ch := make(chan int)
+	go Walk(t, ch)
+	fmt.Printf("%v\n", t)
+	for i := range ch {
+		fmt.Printf("%d, ", i)
+	}
+	fmt.Println()
+}