~ $ cat test.go
package main

import "sync/atomic"

type tree struct {
    links [2]atomic.Pointer[tree]
}

func main() {

}
~$ go run test.go
~$ go version
go version go1.19.3 linux/amd64

~ $ go run test.go
# command-line-arguments
./test.go:5:6: invalid recursive type tree
        ./test.go:5:6: tree refers to
        ./test.go:6:20: atomic.Pointer refers to
        ./test.go:5:6: tree
~ $ go version
go version go1.19.4 linux/amd64