Nested type definitions used in functions

[Chicken935]

The following program sample.go triggers an unexpected result

package main

func foo(barval Bar) {
	if barval.useExists() {
		println("is fee")
	} else {
		println("is not fee")
	}
}

func main() {
	barval := barimpl{true}
	foo(barval)
}

type Bar bar

type bar interface {
	useExists() bool
}

type barimpl struct {
	exists bool
}

func (r barimpl) useExists() bool {
	return r.exists
}

Expected result

$ go run ./sample.go
// exists

Got

$ yaegi ./sample.go
// panic: sample.go:4:5: CFG post-order panic: runtime error: index out of range [0] with length 0

Yaegi Version

v0.16.1

Additional Notes

Encountered this issue when trying to use this package: gopkg.in/inf.v0