cmd/compile/internal/syntax: skip verbose tests in -short mode

src/cmd/compile/internal/syntax/dumper_test.go

@@ -10,6 +10,10 @@ import (
 )
 
 func TestDump(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	ast, err := ReadFile(*src, 0)
 	if err != nil {
 		t.Fatal(err)

src/cmd/compile/internal/syntax/printer_test.go

@@ -11,6 +11,10 @@ import (
 )
 
 func TestPrint(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	ast, err := ReadFile(*src, 0)
 	if err != nil {
 		t.Fatal(err)

src/cmd/compile/internal/syntax/scanner_test.go

@@ -11,6 +11,10 @@ import (
 )
 
 func TestScanner(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	src, err := os.Open("parser.go")
 	if err != nil {
 		t.Fatal(err)