gee, it fukn works! :D

>> def each_file n
>>   n.each do
?>       |name|
?>       yield File.open name, 'r'
>>     end
>>   end
=> nil
>> f
=> ["d2", "d3"]
>> each_file f do
?>     |file|
?>     file.each do
?>       |line|
?>       puts line
>>     end
>>   end
x
xx
yy
yyyyyy
=> ["d2", "d3"]
>>