kubernetes/vendor/go.uber.org/goleak/internal/stack/scan.go

type scanner …

func newScanner(r io.Reader) *scanner { … }

func (s *scanner) Scan() bool { … }

// Unscan stops the scanner from advancing its position
// for the next Scan.
//
// Bytes and Text will return the same token after next Scan
// that they do right now.
func (s *scanner) Unscan() { … }