diff --git a/cmd/genbindings/clang2il.go b/cmd/genbindings/clang2il.go
index 6883e2b6..bf3147ce 100644
--- a/cmd/genbindings/clang2il.go
+++ b/cmd/genbindings/clang2il.go
@@ -404,7 +404,7 @@ func parseTypeString(typeString string) (CppParameter, []CppParameter, error) {
 	epos := strings.LastIndex(typeString, `)`)
 
 	if opos == -1 || epos == -1 {
-		return CppParameter{}, nil, fmt.Errorf("Type string %q missing brackets")
+		return CppParameter{}, nil, fmt.Errorf("Type string %q missing brackets", typeString)
 	}
 
 	returnType := parseSingleTypeString(strings.TrimSpace(typeString[0:opos]))
diff --git a/cmd/genbindings/clang2il_test.go b/cmd/genbindings/clang2il_test.go
new file mode 100644
index 00000000..6c2d32f2
--- /dev/null
+++ b/cmd/genbindings/clang2il_test.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestParseTypeString(t *testing.T) {
+	type testCase struct {
+		input        string
+		expectReturn CppParameter
+		expectParams []CppParameter
+	}
+
+	cases := []testCase{
+		testCase{
+			input:        "void (bool)",
+			expectReturn: CppParameter{ParameterType: "void"},
+			expectParams: []CppParameter{
+				CppParameter{ParameterType: "bool"},
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		r, p, err := parseTypeString(tc.input)
+		if err != nil {
+			t.Errorf("Test %q got error %v", tc.input, err)
+			continue
+		}
+
+		if !reflect.DeepEqual(r, tc.expectReturn) {
+			t.Errorf("Test %q got return=%#v, expected=%#v", tc.input, r, tc.expectReturn)
+		}
+		if !reflect.DeepEqual(p, tc.expectParams) {
+			t.Errorf("Test %q got return=%#v, expected=%#v", tc.input, r, tc.expectReturn)
+		}
+	}
+}