test: fix build (update for new error message)

R=golang-dev
CC=golang-dev
https://golang.org/cl/13521044
diff --git a/test/syntax/chan1.go b/test/syntax/chan1.go
index 868a122..4860422a 100644
--- a/test/syntax/chan1.go
+++ b/test/syntax/chan1.go
@@ -10,8 +10,8 @@
 var v int
 
 func main() {
-	if c <- v { // ERROR "send statement.*value.*select"
+	if c <- v { // ERROR "used as value"
 	}
 }
 
-var _ = c <- v // ERROR "send statement.*value.*select"
+var _ = c <- v // ERROR "used as value"