The type should be the field's when struct is nil

[BubbleGarten]

type Student struct {
	Name string
}

func GetStudent() *Student {
	return nil
}

func TestGetStudentName(t *testing.T) {
	eval, err := expr.Eval("student?.Name", map[string]interface{}{
		"student": GetStudent(),
	})
	if err != nil {
		t.Fatalf("expr.Eval failed: %v", err)
	}
	t.Logf("eval type: %v", reflect.TypeOf(eval)) // output is `eval type: *golang.Student`
}

Actually , I think it's because return nil directly when the struct is nil , but it's not so reasonable.
Is it better to return the zero value( empty string in this case) of the corresponding field ?

[antonmedv]

Yes, you are right! Return should be just nil. I will fix it.

[antonmedv]

Fixed. Now a proper nil is returned!