diff --git a/cmd/globdraw/main.go b/cmd/globdraw/main.go
index d268372..ce5a76e 100644
--- a/cmd/globdraw/main.go
+++ b/cmd/globdraw/main.go
@@ -54,7 +54,7 @@ func main() {
 		for _, c := range strings.Split(*sep, ",") {
 			r, w := utf8.DecodeRuneInString(c)
 			if len(c) > w {
-				fmt.Println("only single charactered separators are allowed: %+q", c)
+				fmt.Printf("only single charactered separators are allowed: %+q\n", c)
 				os.Exit(1)
 			}
 			separators = append(separators, r)
diff --git a/compiler/compiler_test.go b/compiler/compiler_test.go
index 3f00e2e..e982077 100644
--- a/compiler/compiler_test.go
+++ b/compiler/compiler_test.go
@@ -113,7 +113,7 @@ func TestCompiler(t *testing.T) {
 					match.NewSingle(separators),
 				}),
 				match.NewAny(separators),
-				nil,
+				match.Nothing{},
 			),
 		},
 		{
@@ -129,13 +129,13 @@ func TestCompiler(t *testing.T) {
 			sep: separators,
 			exp: match.NewTree(
 				match.NewText("/"),
-				nil,
+				match.Nothing{},
 				match.NewTree(
 					match.MustIndexedAnyOf(
 						match.NewText("z"),
 						match.NewText("ab"),
 					),
-					nil,
+					match.Nothing{},
 					match.NewSuper(),
 				),
 			),
@@ -156,7 +156,7 @@ func TestCompiler(t *testing.T) {
 					match.NewSingle(separators),
 				}),
 				match.NewSuper(),
-				nil,
+				match.Nothing{},
 			),
 		},
 		{
@@ -273,7 +273,7 @@ func TestCompiler(t *testing.T) {
 			),
 			exp: match.NewTree(
 				match.NewText("abc"),
-				nil,
+				match.Nothing{},
 				match.NewAnyOf(
 					match.NewSingle(nil),
 					match.NewList([]rune{'d', 'e', 'f'}, false),
@@ -293,7 +293,7 @@ func TestCompiler(t *testing.T) {
 					match.NewRange('a', 'z', false),
 					match.NewRange('a', 'x', true),
 				}),
-				nil,
+				match.Nothing{},
 				match.NewSuper(),
 			),
 		},
diff --git a/match/optimize.go b/match/optimize.go
index 2dad6e5..61f880a 100644
--- a/match/optimize.go
+++ b/match/optimize.go
@@ -40,8 +40,8 @@ func Optimize(m Matcher) (opt Matcher) {
 		}
 
 		var (
-			leftNil  = v.left == nil
-			rightNil = v.right == nil
+			leftNil  = v.left == nil || v.left == Nothing{}
+			rightNil = v.right == nil || v.right == Nothing{}
 		)
 		if leftNil && rightNil {
 			return NewText(txt.s)