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Did you know this? I had no idea. If you define SCRIPT_LINES__ constant as a Hash, then the source code for all load‘d or require‘d files will be stored in the Hash! The key is the path to the source file and the value is an array of strings, each a line of source code.

 >> SCRIPT_LINES__ = {}
 >> require 'drb'
 >> SCRIPT_LINES__.keys
 => ["/usr/local/lib/ruby/1.8/drb/drb.rb", 
     "/usr/local/lib/ruby/1.8/drb/eq.rb", 
     "/usr/local/lib/ruby/1.8/drb/invokemethod.rb", 
     "/usr/local/lib/ruby/1.8/thread.rb", 
     "/usr/local/lib/ruby/1.8/drb.rb"]
 >> SCRIPT_LINES__['/usr/local/lib/ruby/1.8/drb.rb']
 => ["require 'drb/drb'\n", "\n"]

WEIRD. What gives with the trailing underscores? It’s such a big constant that it leaves a two-character shadow!!

Note that $SAFE must be zero. See yycompile() in parse.y for details. But, yes, I saw this in PickAxe the Second.