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Perl programmers have all the fun.  They have an entire section of the CPAN
devoted to their playing around.  The ACME modules are all fun little toys that
have interesting if rarely very useful effects.

This week's Ruby Quiz is to port ACME::Bleach to Ruby.  I won't make you go
hunting through the CPAN to figure it out though.  Here's how our version will
work:

	1.  Make a Ruby file that is both an executable and a library.  We'll call
	    it "whiteout".
	2.  When "whiteout" is executed, it should take ARGV to be a list of Ruby
	    source code files to alter in-place.  (You may save backup copies if you
	    like, but the original file should be changed.)  Here are the changes:
	    a.  A Shebang line, if present is to be passed through the filter
	        without any changes.
	    b.  The script should then add the line:  require "whiteout"
	    c.  The entire rest of the file should be made invisible.  You might do
	        this by converting the rest of the file to whitespace, as
	        ACME::Bleach does.
	3.  When "whiteout" is required, the original code must be executed with no
	    change in functionality.

Let's show those Perl guys that we know how to have a good time too!