Doing the fibonacci closure example

but I'm too sleepy to figure out the right way to make the first two
yielded values 1's.

gotime/src/exercise-fibonacci-closure.go

@@ -0,0 +1,23 @@
+package main
+
+import "fmt"
+
+// fibonacci is a function that returns
+// a function that returns an int.
+func fibonacci() func() int {
+    prev := 0
+    cur := 1
+    return func() int {
+        old_cur := cur
+        cur = prev + cur
+        prev = old_cur
+        return cur
+    }
+}
+
+func main() {
+    f := fibonacci()
+    for i := 0; i < 10; i++ {
+        fmt.Println(f())
+    }
+}