test: fix build

syntax/*: update messages
sliceerr3.go: bizarre new error fixed by deleting a space.

I could have sworn I ran all.bash before submitting the CL that triggered these.

TBR=golang-dev@googlegroups.com

R=golang-dev
CC=golang-dev
https://golang.org/cl/12812044

test/slice3err.go

@@ -20,7 +20,7 @@ func f() {
 	_ = array[::] // ERROR "middle index required in 3-index slice" "final index required in 3-index slice"
 	_ = array[i::] // ERROR "middle index required in 3-index slice" "final index required in 3-index slice"
 	_ = array[:j:] // ERROR "final index required in 3-index slice"
-	_ = array[i:j:] // ERROR  "final index required in 3-index slice"
+	_ = array[i:j:] // ERROR "final index required in 3-index slice"
 	_ = array[::k] // ERROR "middle index required in 3-index slice"
 	_ = array[i::k] // ERROR "middle index required in 3-index slice"
 	_ = array[:j:k]

test/syntax/semi1.go

@@ -7,7 +7,7 @@
 package main
 
 func main() {
-	if x; y		// ERROR "unexpected semicolon or newline before .?{.?|undefined"
+	if x; y		// ERROR "missing { after if clause|undefined"
 	{
 		z	// GCCGO_ERROR "undefined"
 

test/syntax/semi2.go

@@ -7,7 +7,7 @@
 package main
 
 func main() {
-	switch x; y	// ERROR "unexpected semicolon or newline before .?{.?|undefined"
+	switch x; y	// ERROR "missing { after switch clause|undefined"
 	{
 		z
 

test/syntax/semi3.go

@@ -7,7 +7,7 @@
 package main
 
 func main() {
-	for x; y; z	// ERROR "unexpected semicolon or newline before .?{.?|undefined"
+	for x; y; z	// ERROR "missing { after for clause|undefined"
 	{
 		z	// GCCGO_ERROR "undefined"
 

test/syntax/semi4.go

@@ -8,7 +8,7 @@ package main
 
 func main() {
 	for x		// GCCGO_ERROR "undefined"
-	{		// ERROR "unexpected semicolon or newline before .?{.?"
+	{		// ERROR "missing { after for clause"
 		z	// GCCGO_ERROR "undefined"