func (l *lexer) emit(t ItemType) {
	l.items <- item{t, l.start, l.input[l.start:l.pos]}
	l.start = l.pos
}
func (l *lexer) emit(t ItemType) {
	l.items <- item{t, l.start, l.input[l.start:l.pos]}
	l.start = l.pos
}
func ( l * lexer ) emit ( t ItemType ) { l . items <- item { t , l . start , l . input [ l . start : l . pos ] } l . start = l . pos }
// emit passes an item back to the client.
emit passes an item back to the client .