unexpect `panic: invalid type` in os.ReadDir

```go
package main

import (
	"fmt"
	"os"
)

func main() {
	dir, err := os.ReadDir(".")
	if err != nil {
		panic(err)
	}
	for _, file := range dir {
		fmt.Println(file.Name())
	}
}
```
both in macos & linux
```bash
❯ llgo run .
panic: invalid type
```
llgo version with 93b9b7d44c02d0e07f0219c01d4594de45154744
