Collapsing tree into more sane Go project layout

since I was in here looking at something unrelated...

gotime/gotour-artifacts/channels/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"time"
+)
+
+func sum(a []int, c chan int) {
+	sum := 0
+	for _, v := range a {
+		sum += v
+	}
+	to_sleep := time.Duration(100*math.Abs(float64(sum))) * time.Millisecond
+	fmt.Printf("Sleeping %s...\n", to_sleep)
+	time.Sleep(to_sleep)
+	c <- sum
+}
+
+func main() {
+	a := []int{7, 2, 8, -9, 4, 0}
+
+	c := make(chan int)
+	go sum(a[:len(a)/2], c)
+	go sum(a[len(a)/2:], c)
+	x := <-c
+	fmt.Printf("x = %d\n", x)
+	y := <-c
+	fmt.Printf("y = %d\n", y)
+	fmt.Println(x, y, x+y)
+}