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-rw-r--r--test/reorder.go167
1 files changed, 167 insertions, 0 deletions
diff --git a/test/reorder.go b/test/reorder.go
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--- /dev/null
+++ b/test/reorder.go
@@ -0,0 +1,167 @@
+// run
+
+// Copyright 2011 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 reordering of assignments.
+
+package main
+
+import "fmt"
+
+func main() {
+ p1()
+ p2()
+ p3()
+ p4()
+ p5()
+ p6()
+ p7()
+ p8()
+ p9()
+ p10()
+ p11()
+}
+
+var gx []int
+
+func f(i int) int {
+ return gx[i]
+}
+
+func check(x []int, x0, x1, x2 int) {
+ if x[0] != x0 || x[1] != x1 || x[2] != x2 {
+ fmt.Printf("%v, want %d,%d,%d\n", x, x0, x1, x2)
+ panic("failed")
+ }
+}
+
+func check3(x, y, z, xx, yy, zz int) {
+ if x != xx || y != yy || z != zz {
+ fmt.Printf("%d,%d,%d, want %d,%d,%d\n", x, y, z, xx, yy, zz)
+ panic("failed")
+ }
+}
+
+func p1() {
+ x := []int{1, 2, 3}
+ i := 0
+ i, x[i] = 1, 100
+ _ = i
+ check(x, 100, 2, 3)
+}
+
+func p2() {
+ x := []int{1, 2, 3}
+ i := 0
+ x[i], i = 100, 1
+ _ = i
+ check(x, 100, 2, 3)
+}
+
+func p3() {
+ x := []int{1, 2, 3}
+ y := x
+ gx = x
+ x[1], y[0] = f(0), f(1)
+ check(x, 2, 1, 3)
+}
+
+func p4() {
+ x := []int{1, 2, 3}
+ y := x
+ gx = x
+ x[1], y[0] = gx[0], gx[1]
+ check(x, 2, 1, 3)
+}
+
+func p5() {
+ x := []int{1, 2, 3}
+ y := x
+ p := &x[0]
+ q := &x[1]
+ *p, *q = x[1], y[0]
+ check(x, 2, 1, 3)
+}
+
+func p6() {
+ x := 1
+ y := 2
+ z := 3
+ px := &x
+ py := &y
+ *px, *py = y, x
+ check3(x, y, z, 2, 1, 3)
+}
+
+func f1(x, y, z int) (xx, yy, zz int) {
+ return x, y, z
+}
+
+func f2() (x, y, z int) {
+ return f1(2, 1, 3)
+}
+
+func p7() {
+ x, y, z := f2()
+ check3(x, y, z, 2, 1, 3)
+}
+
+func p8() {
+ m := make(map[int]int)
+ m[0] = len(m)
+ if m[0] != 0 {
+ panic(m[0])
+ }
+}
+
+// Issue #13433: Left-to-right assignment of OAS2XXX nodes.
+func p9() {
+ var x bool
+
+ // OAS2FUNC
+ x, x = fn()
+ checkOAS2XXX(x, "x, x = fn()")
+
+ // OAS2RECV
+ var c = make(chan bool, 10)
+ c <- false
+ x, x = <-c
+ checkOAS2XXX(x, "x, x <-c")
+
+ // OAS2MAPR
+ var m = map[int]bool{0: false}
+ x, x = m[0]
+ checkOAS2XXX(x, "x, x = m[0]")
+
+ // OAS2DOTTYPE
+ var i interface{} = false
+ x, x = i.(bool)
+ checkOAS2XXX(x, "x, x = i.(bool)")
+}
+
+//go:noinline
+func fn() (bool, bool) { return false, true }
+
+// checks the order of OAS2XXX.
+func checkOAS2XXX(x bool, s string) {
+ if !x {
+ fmt.Printf("%s; got=(false); want=(true)\n", s)
+ panic("failed")
+ }
+}
+
+//go:noinline
+func fp() (*int, int) { return nil, 42 }
+
+func p10() {
+ p := new(int)
+ p, *p = fp()
+}
+
+func p11() {
+ var i interface{}
+ p := new(bool)
+ p, *p = i.(*bool)
+}