go/src/flag/example_test.go

var species …

var gopherType …

func init() { … }

type interval …

// String is the method to format the flag's value, part of the flag.Value interface.
// The String method's output will be used in diagnostics.
func (i *interval) String() string { … }

// Set is the method to set the flag value, part of the flag.Value interface.
// Set's argument is a string to be parsed to set the flag.
// It's a comma-separated list, so we split it.
func (i *interval) Set(value string) error { … }

var intervalFlag …

func init() { … }

func Example() { … }