From 0cd35bd28696aa7b73f8327a07b31c2853b901ba Mon Sep 17 00:00:00 2001
From: Jordan Orelli <jordanorelli@gmail.com>
Date: Sun, 21 Oct 2012 15:23:56 -0400
Subject: [PATCH] fixed up lexing of -

---
 lex.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lex.go b/lex.go
index 9abbdd4..dee14db 100644
--- a/lex.go
+++ b/lex.go
@@ -126,6 +126,12 @@ func lexMinus(l *lexer) (stateFn, error) {
 	case ' ', '\t', '\n', '\r':
 		l.emit(symbolToken)
 		return lexWhitespace, nil
+	case '(':
+		l.emit(symbolToken)
+		return lexOpenParen, nil
+	case ')':
+		l.emit(symbolToken)
+		return lexCloseParen, nil
 	case '.':
 		l.keep()
 		return lexFloat, nil