go/ast, go/token: actually run tests; fix go/ast test

R=gri
CC=golang-dev
https://golang.org/cl/5292048

src/pkg/Makefile

@@ -203,9 +203,7 @@ NOTEST+=\
 	exp/gui\
 	exp/gui/x11\
 	exp/sql/driver\
-	go/ast\
 	go/doc\
-	go/token\
 	hash\
 	http/pprof\
 	http/httptest\

src/pkg/go/ast/print_test.go

@@ -41,10 +41,10 @@ var tests = []struct {
 		4  }`},
 
 	// structs
-	{struct{ x, y int }{42, 991},
-		`0  struct { x int; y int } {
-		1  .  x: 42
-		2  .  y: 991
+	{struct{ X, Y int }{42, 991},
+		`0  struct { X int; Y int } {
+		1  .  X: 42
+		2  .  Y: 991
 		3  }`},
 }