adding a block test and using PARAM_SPLAT to remove the last shift/reduce conflict

lib/coffee_script/lexer.rb

@@ -219,7 +219,8 @@ module CoffeeScript
         i -= 1
         tok = @tokens[i]
         return if !tok
-        next if ['*', ','].include?(tok[0])
+        next if tok[0] == ','
+        next tok[0] = :PARAM_SPLAT if tok[0] == '*'
         return if tok[0] != :IDENTIFIER
         tok[0] = :PARAM
       end