diff --git a/obj/obj.go b/obj/obj.go
index 70d2ed9..d7e205e 100644
--- a/obj/obj.go
+++ b/obj/obj.go
@@ -48,7 +48,7 @@ func (o *Object) AsType() string {
 
 // Return the value as string that was converted by fmt.Sprintf for each type
 func (o *Object) AsString() string {
-	if o == nil || !o.touch {
+	if !o.touch {
 		return ""
 	}
 
@@ -59,15 +59,20 @@ func (o *Object) AsString() string {
 		return "<nil>"
 	case bool:
 		return fmt.Sprintf("<%t>", o.value)
+	case *bool:
+		return o.AsDumpString()
 	case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
 		return fmt.Sprintf("%d", o.value)
 	case float32, float64, complex64, complex128:
 		return fmt.Sprintf("%g", o.value)
+	case *int, *int8, *int16, *int32, *int64, *uint, *uint8, *uint16, *uint32, *uint64,
+			*float32, *float64, *complex64, *complex128:
+		return o.AsDumpString()
 	case error:
-		return fmt.Sprintf("%+v", o.value)
+		return o.AsDumpString()
 	default:
-		if o.IsStructType() {
-			return fmt.Sprintf("%p, %#v", &o.value, o.value)
+		if o.IsPointerType() {
+			return fmt.Sprintf("%p, %#v", o.value, o.value)
 		} else {
 			return fmt.Sprintf("%#v", o.value)
 		}
diff --git a/obj/obj_test.go b/obj/obj_test.go
index fa99a3f..2a90bad 100644
--- a/obj/obj_test.go
+++ b/obj/obj_test.go
@@ -65,11 +65,41 @@ func TestIsPointerType(t *testing.T) {
 	}
 }
 
-func TestPointerValue(t *testing.T) {
+func TestBooleanPointer(t *testing.T) {
+	f := false
+	o := NewObject(&f)
+
+	expectRe := regexp.MustCompile(`\(\*bool\)\([0-9a-fx]+\)\(false\)`)
+	if expectRe.FindStringSubmatch(o.AsString()) == nil {
+		t.Errorf("Not matched the regexp `%s` for %q", expectRe.String(), o.AsString())
+	}
+}
+
+func TestError(t *testing.T) {
+	e := fmt.Errorf("foo error")
+	o := NewObject(e)
+
+	expectRe := regexp.MustCompile(`\(\*errors\.errorString\)\([0-9a-fx]+\)\(foo error\)`)
+	if expectRe.FindStringSubmatch(o.AsString()) == nil {
+		t.Errorf("Not matched the regexp `%s` for %q", expectRe.String(), o.AsString())
+	}
+}
+
+func TestPointerValueInt(t *testing.T) {
 	i := 123
 	o := NewObject(&i)
 
-	expectRe := regexp.MustCompile(`\(\*int\)\([0-9a-fx]+\)`)
+	expectRe := regexp.MustCompile(`\(\*int\)\([0-9a-fx]+\)\(123\)`)
+	if expectRe.FindStringSubmatch(o.AsString()) == nil {
+		t.Errorf("Not matched the regexp `%s` for %q", expectRe.String(), o.AsString())
+	}
+}
+
+func TestPointerValueFloat(t *testing.T) {
+	var i float64 = 0.123
+	o := NewObject(&i)
+
+	expectRe := regexp.MustCompile(`\(*float64\)\([0-9a-fx]+\)\(0\.123\)`)
 	if expectRe.FindStringSubmatch(o.AsString()) == nil {
 		t.Errorf("Not matched the regexp `%s` for %q", expectRe.String(), o.AsString())
 	}
@@ -79,7 +109,17 @@ func TestStructValue(t *testing.T) {
 	i := struct{ ID int }{ ID: 123 }
 	o := NewObject(i)
 
-	expectRe := regexp.MustCompile(`[0-9a-fx]+, struct { ID int }{ID:123}`)
+	expectRe := regexp.MustCompile(`struct { ID int }{ID:123}`)
+	if expectRe.FindStringSubmatch(o.AsString()) == nil {
+		t.Errorf("Not matched the regexp `%s` for %q", expectRe.String(), o.AsString())
+	}
+}
+
+func TestStructPointerValue(t *testing.T) {
+	i := struct{ ID int }{ ID: 123 }
+	o := NewObject(&i)
+
+	expectRe := regexp.MustCompile(`[0-9a-fx]+, &struct { ID int }{ID:123}`)
 	if expectRe.FindStringSubmatch(o.AsString()) == nil {
 		t.Errorf("Not matched the regexp `%s` for %q", expectRe.String(), o.AsString())
 	}
diff --git a/witness_test.go b/witness_test.go
index 8482089..4513f16 100644
--- a/witness_test.go
+++ b/witness_test.go
@@ -40,7 +40,7 @@ func TestError(t *testing.T) {
 		t.Errorf("Not matched the regexp `%s` for %q", gotTypeRe.String(), res)
 	}
 
-	gotRe := regexp.MustCompile(`Actually got:\s*\terror example 123`)
+	gotRe := regexp.MustCompile(`Actually got:\s*\t\(\*errors\.errorString\)\([0-9a-fx]+\)\(error example 123\)`)
 	if gotRe.FindStringSubmatch(res) == nil {
 		t.Errorf("Not matched the regexp `%s` for %q", gotRe.String(), res)
 	}