             }
             return .Whitespace
 
-            // Strings.
+        // Strings.
         case "\"".utf8Constant:
             // Scan to the end of the string.
             //

            }
            return .Number(value: String(utf8[Range(start: startIndex, end: index)]))

            // 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() {
