Loop a BST using channel in golang

loop-bst.go

/**
 * Definition for a binary tree node.
 * type TreeNode struct {
 *     Val int
 *     Left *TreeNode
 *     Right *TreeNode
 * }
 */
func printBST(root *TreeNode) {
    chn := make(chan int)
    
    go func(){
        // remember to close the chan!
        defer close(chn)
        loopChn(root, chn)
    }()
    
    for n := range chn {
        fmt.Println(n)
    }
}

func loopChn(leaf *TreeNode, chn chan int) {
    if leaf == nil {
        return
    }
    loopChn(leaf.Left, chn)
    chn <- leaf.Val
    loopChn(leaf.Right, chn)
}