             }
             return .Number(value: String(utf8[Range(start: startIndex, end: index)]))
 
-            // Identifiers.
+        // Identifiers.
         case let c where c.isIdentifierChar():
             // Scan to the end of the identifier.
             while let c = look() where c.isIdentifierChar() {

            }
            return .Comment

            // Whitespace.
        case let c where c.isSpace():
            // Scan to the end of the whitespace
            while let c = look() where c.isSpace() {

            }
            return .Whitespace

        // Strings.
        case "\"".utf8Constant:
            // Scan to the end of the string.
            //
