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-rw-r--r--test/simassign.go79
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+// run
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test simultaneous assignment.
+
+package main
+
+var a, b, c, d, e, f, g, h, i int
+
+func printit() {
+ println(a, b, c, d, e, f, g, h, i)
+}
+
+func testit(permuteok bool) bool {
+ if a+b+c+d+e+f+g+h+i != 45 {
+ print("sum does not add to 45\n")
+ printit()
+ return false
+ }
+ return permuteok ||
+ a == 1 &&
+ b == 2 &&
+ c == 3 &&
+ d == 4 &&
+ e == 5 &&
+ f == 6 &&
+ g == 7 &&
+ h == 8 &&
+ i == 9
+}
+
+func swap(x, y int) (u, v int) {
+ return y, x
+}
+
+func main() {
+ a = 1
+ b = 2
+ c = 3
+ d = 4
+ e = 5
+ f = 6
+ g = 7
+ h = 8
+ i = 9
+
+ if !testit(false) {
+ panic("init val\n")
+ }
+
+ for z := 0; z < 100; z++ {
+ a, b, c, d, e, f, g, h, i = b, c, d, a, i, e, f, g, h
+
+ if !testit(z%20 != 19) {
+ print("on ", z, "th iteration\n")
+ printit()
+ panic("fail")
+ }
+ }
+
+ if !testit(false) {
+ print("final val\n")
+ printit()
+ panic("fail")
+ }
+
+ a, b = swap(1, 2)
+ if a != 2 || b != 1 {
+ panic("bad swap")
+ }
+
+ a, b = swap(swap(a, b))
+ if a != 2 || b != 1 {
+ panic("bad swap")
+ }
+}