func (ft *fieldTree) insert(cname []string) {
	if ft.sub == nil {
		ft.sub = make(map[string]fieldTree)
	}
	if len(cname) == 0 {
		ft.ok = true
		return
	}
	sub := ft.sub[cname[0]]
	sub.insert(cname[1:])
	ft.sub[cname[0]] = sub
}
func (ft *fieldTree) insert(cname []string) {
	if ft.sub == nil {
		ft.sub = make(map[string]fieldTree)
	}
	if len(cname) == 0 {
		ft.ok = true
		return
	}
	sub := ft.sub[cname[0]]
	sub.insert(cname[1:])
	ft.sub[cname[0]] = sub
}
func ( ft * fieldTree ) insert ( cname [ ] string ) { if ft . sub == nil { ft . sub = make ( map [ string ] fieldTree ) } if len ( cname ) == 0 { ft . ok = true return } sub := ft . sub [ cname [ 0 ] ] sub . insert ( cname [ 1 : ] ) ft . sub [ cname [ 0 ] ] = sub }
// insert inserts a sequence of field accesses into the tree.
insert inserts a sequence of field accesses into the tree .