test: enable tests using v, ok := <-ch syntax

R=rsc, r
CC=golang-dev
https://golang.org/cl/4290059

test/fixedbugs/bug069.go

@@ -7,15 +7,14 @@
 package main
 
 func main() {
-	//TODO(rsc): uncomment when this syntax is valid for receive+check closed
-	//	c := make(chan int);
-	//	ok := false;
-	//	var i int;
-	//
-	//	i, ok = <-c;  // works
-	//	_, _ = i, ok;
-	//
-	//	ca := new([2]chan int);
-	//	i, ok = <-(ca[0]);  // fails: c.go:11: bad shape across assignment - cr=1 cl=2
-	//	_, _ = i, ok;
+	c := make(chan int);
+	ok := false;
+	var i int;
+	
+	i, ok = <-c;  // works
+	_, _ = i, ok;
+	
+	ca := new([2]chan int);
+	i, ok = <-(ca[0]);  // fails: c.go:11: bad shape across assignment - cr=1 cl=2
+	_, _ = i, ok;
 }

test/fixedbugs/bug196.go

@@ -13,12 +13,11 @@ var i int
 func multi() (int, int) { return 1, 2 }
 
 func xxx() {
-	//TODO(rsc): uncomment when this syntax is valid for receive+check closed
-	//	var c chan int
-	//	x, ok := <-c
+	var c chan int
+	x, ok := <-c
 
 	var m map[int]int
-	x, ok := m[1]
+	x, ok = m[1]
 
 	var i interface{}
 	var xx int

test/fixedbugs/bug234.go

@@ -7,17 +7,17 @@
 package main
 
 func main() {
-	//TODO(rsc): uncomment when this syntax is valid for receive+check closed
-	//	c := make(chan int, 1)
-	//	c <- 100
-	//	x, ok := <-c
-	//	if x != 100 || !ok {
-	//		println("x=", x, " ok=", ok, " want 100, true")
-	//		panic("fail")
-	//	}
-	//	x, ok = <-c
-	//	if x != 0 || ok {
-	//		println("x=", x, " ok=", ok, " want 0, false")
-	//		panic("fail")
-	//	}
+	c := make(chan int, 1)
+	c <- 100
+	x, ok := <-c
+	if x != 100 || !ok {
+		println("x=", x, " ok=", ok, " want 100, true")
+		panic("fail")
+	}
+	close(c)
+	x, ok = <-c
+	if x != 0 || ok {
+		println("x=", x, " ok=", ok, " want 0, false")
+		panic("fail")
+	}
 }

test/fixedbugs/bug242.go

@@ -101,13 +101,11 @@ func main() {
 
 	c := make(chan byte, 1)
 	c <- 'C'
-	//TODO(rsc): uncomment when this syntax is valid for receive+check closed
 	// 15          16
-	//	*f(), p1 = <-e1(c, 16)
-	*f(), p1 = <-e1(c, 16), true // delete uncommenting above
+	*f(), p1 = <-e1(c, 16)
+	close(c)
 	// 17          18
-	//	*f(), p2 = <-e1(c, 18)
-	*f(), p2, _ = 0, false, e1(c, 18) // delete when uncommenting above
+	*f(), p2 = <-e1(c, 18)
 	a[17] += '0'
 	if !p1 || p2 {
 		println("bad chan check", i, p1, p2)