map["key"] syntax issue

[caiuskong]

The following program sample.go triggers an unexpected result

package main

func main() {
  var m = map[string]interface{}{
    "name": "caius",
  }

  var pp interface{}
  pp = "abc"
  pp, ok := m["pp"]
  fmt.Println(">>pp", pp, ok)  // Result: pp="abc"，not nil !!! (In the go interpreter, the result is nil)
}

Expected result

>>pp <nil> false

Got

>>pp abc false

Yaegi Version

0.15.1

Additional Notes

No response