diff --git a/syntax/filetests_test.go b/syntax/filetests_test.go
index 5ca3f7286..32808c473 100644
--- a/syntax/filetests_test.go
+++ b/syntax/filetests_test.go
@@ -2671,7 +2671,7 @@ var fileTests = []testCase{
 		}),
 	},
 	{
-		Strs: []string{"$((a /= b))"},
+		Strs: []string{"$((a /= b))", "$((a/=b))"},
 		common: arithmExp(&BinaryArithm{
 			Op: QuoAssgn,
 			X:  litWord("a"),
diff --git a/syntax/printer_test.go b/syntax/printer_test.go
index 1170b5dd3..1e054ee44 100644
--- a/syntax/printer_test.go
+++ b/syntax/printer_test.go
@@ -718,6 +718,10 @@ func TestPrintKeepPadding(t *testing.T) {
 func TestPrintMinify(t *testing.T) {
 	var tests = [...]printCase{
 		samePrint("echo foo bar $a $(b)"),
+		{
+			"#comment",
+			"",
+		},
 		{
 			"foo #comment",
 			"foo",