func lexSExp(x *Lexer) stateFn {
	x.emit(IonSExpStart)
	x.containers = append(x.containers, '(')
	return lexValue
}
// lexSExp emits the start of an s-expression.
lexSExp emits the start of an s-expression.
// lexSExp emits the start of an s - expression .
func lexSExp(x *Lexer) stateFn {
	x.emit(IonSExpStart)
	x.containers = append(x.containers, '(')
	return lexValue
}
func lexSExp ( x * Lexer ) stateFn { x . emit ( IonSExpStart ) x . containers = append ( x . containers , '(' ) return lexValue }
lexSExp emits the start of an s-expression.
lexSExp emits the start of an s - expression .