func (n *CommaOpt) Pos() token.Pos {
	if n == nil {
		return 0
	}
	return n.Token.Pos()
}
Pos reports the position of the first component of n or zero if it's empty.
package wl
import (
	"fmt"
	"go/token"
)
type CommaOpt struct {
	Token Token
}
func (n *CommaOpt) fragment() interface{} { return n }
func (n *CommaOpt) String() string {
	return prettyString(n)
}