const go/scanner.ScanComments

3 uses

	go/scanner (current package)
		scanner.go#L105: 	ScanComments    Mode = 1 << iota // return comments as COMMENT tokens
		scanner.go#L905: 				if s.mode&ScanComments == 0 {

	go/parser
		parser.go#L71: 	p.scanner.Init(p.file, src, eh, scanner.ScanComments)