diff --git a/ssa/ssa_test.go b/ssa/ssa_test.go
index 3ccbe147..838dd92a 100644
--- a/ssa/ssa_test.go
+++ b/ssa/ssa_test.go
@@ -21,6 +21,8 @@ import (
 	"go/token"
 	"go/types"
 	"testing"
+
+	"github.com/goplus/llvm"
 )
 
 /*
@@ -30,6 +32,26 @@ func TestMakeInterface(t *testing.T) {
 }
 */
 
+func TestTypes(t *testing.T) {
+	ctx := llvm.NewContext()
+	llvmIntType(ctx, 4)
+
+	intT := types.NewVar(0, nil, "", types.Typ[types.Int])
+	ret := types.NewTuple(intT, intT)
+	sig := types.NewSignatureType(nil, nil, nil, nil, ret, false)
+	prog := NewProgram(nil)
+	prog.retType(sig)
+}
+
+func TestIndexType(t *testing.T) {
+	defer func() {
+		if r := recover(); r == nil {
+			t.Log("indexType: no error?")
+		}
+	}()
+	indexType(types.Typ[types.Int])
+}
+
 func TestCvtCType(t *testing.T) {
 	test := func(typ types.Type) {
 		defer func() {
diff --git a/ssa/type.go b/ssa/type.go
index 93feee6b..b983a22e 100644
--- a/ssa/type.go
+++ b/ssa/type.go
@@ -91,9 +91,11 @@ type aType struct {
 
 type Type = *aType
 
+/*
 func (p Program) Slice(typ Type) Type {
 	return p.Type(types.NewSlice(typ.t))
 }
+*/
 
 func (p Program) Pointer(typ Type) Type {
 	return p.Type(types.NewPointer(typ.t))