1547 use strict: octal literals prohibited

Author: geraldalewis

src/lexer.coffee

@@ -134,6 +134,8 @@ exports.Lexer = class Lexer
     return 0 unless match = NUMBER.exec @chunk
     number = match[0]
     lexedLength = number.length
+    if octalLiteral = /^0[0-7]+$/.test number
+      @error 'octal literals are not allowed'
     if binaryLiteral = /0b([01]+)/.exec number
       number = (parseInt binaryLiteral[1], 2).toString()
     @token 'NUMBER', number