//     50  .  FileStart: 1:1
	//     51  .  FileEnd: 5:3
	//     52  .  Scope: *ast.Scope {
	//     53  .  .  Objects: map[string]*ast.Object (len = 1) {
	//     54  .  .  .  "main": *(obj @ 11)
	//     55  .  .  }
	//     56  .  }
	//     57  .  Unresolved: []*ast.Ident (len = 1) {
	//     58  .  .  0: *(obj @ 29)
	//     59  .  }
	//     60  .  GoVersion: ""
	//     61  }
}

func ExamplePreorder() {

	"os"
	"time"
)

// zeroSource is an io.Reader that returns an unlimited number of zero bytes.
type zeroSource struct{}

func (zeroSource) Read(b []byte) (n int, err error) {
	clear(b)
	return len(b), nil
}

func ExampleDial() {
	// Connecting with a custom root-certificate set.

	const rootPEM = `
-- GlobalSign Root R2, valid until Dec 15, 2021
-----BEGIN CERTIFICATE-----