diff --git a/ucl/inst.go b/ucl/inst.go
index a42376b..5c42bf7 100644
--- a/ucl/inst.go
+++ b/ucl/inst.go
@@ -56,7 +56,7 @@ func New(opts ...InstOption) *Inst {
 	rootEC.root = rootEC
 
 	rootEC.addCmd("echo", invokableFunc(echoBuiltin))
-	rootEC.addCmd("var", invokableFunc(setBuiltin))
+	rootEC.addCmd("set", invokableFunc(setBuiltin))
 	rootEC.addCmd("toUpper", invokableFunc(toUpperBuiltin))
 	rootEC.addCmd("len", invokableFunc(lenBuiltin))
 	rootEC.addCmd("keys", invokableFunc(keysBuiltin))
diff --git a/ucl/testbuiltins_test.go b/ucl/testbuiltins_test.go
index 5fa3a15..edaa5e8 100644
--- a/ucl/testbuiltins_test.go
+++ b/ucl/testbuiltins_test.go
@@ -192,7 +192,7 @@ func TestBuiltins_If(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -382,7 +382,7 @@ func TestBuiltins_Try(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			if tt.wantErr != "" {
 				assert.Error(t, err)
@@ -422,7 +422,7 @@ func TestBuiltins_ForEach(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -466,7 +466,7 @@ func TestBuiltins_Break(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -507,7 +507,7 @@ func TestBuiltins_Continue(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -587,7 +587,7 @@ func TestBuiltins_Procs(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -712,7 +712,7 @@ func TestBuiltins_Return(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -774,7 +774,7 @@ func TestBuiltins_Seq(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -821,7 +821,7 @@ func TestBuiltins_Map(t *testing.T) {
 			outW := bytes.NewBuffer(nil)
 
 			inst := New(WithOut(outW), WithTestBuiltin())
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -921,7 +921,7 @@ func TestBuiltins_Index(t *testing.T) {
 					},
 				}, nil
 			})
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -980,7 +980,7 @@ func TestBuiltins_Len(t *testing.T) {
 					missing: "missing",
 				}, nil
 			})
-			err := EvalAndDisplay(ctx, inst, tt.expr)
+			err := evalAndDisplay(ctx, inst, tt.expr)
 
 			assert.NoError(t, err)
 			assert.Equal(t, tt.want, outW.String())
@@ -1437,3 +1437,32 @@ func TestBuiltins_Cat(t *testing.T) {
 		})
 	}
 }
+
+func evalAndDisplay(ctx context.Context, inst *Inst, expr string) error {
+	res, err := inst.eval(ctx, expr)
+	if err != nil {
+		return err
+	}
+
+	return displayResult(ctx, inst, res)
+}
+
+func displayResult(ctx context.Context, inst *Inst, res Object) (err error) {
+	switch v := res.(type) {
+	case nil:
+		if _, err = fmt.Fprintln(inst.out, "(nil)"); err != nil {
+			return err
+		}
+	case Listable:
+		for i := 0; i < v.Len(); i++ {
+			if err = displayResult(ctx, inst, v.Index(i)); err != nil {
+				return err
+			}
+		}
+	default:
+		if _, err = fmt.Fprintln(inst.out, v.String()); err != nil {
+			return err
+		}
+	}
+	return nil
+}