pre.rb

eval \
eval(\
#puts(\
#!if defined?(class ENV::FRIENDLY; end)
%{$_   =
  %%%
#{(
 (*
)=*$<
 ).map {|$_|
~%r ^#! messiness? sub( %r #{
%.^...% (.+) }{1} nonsense, <<' >>'.
  \1
 >>
delete( %%% <<'>>  
):'
) ) : ( (
[ [ # ] ]
  sub( %r
^ #{   %q
(
.. %	*\\s*	
}  $)
xenon) { @_ = $1.inspect
%( $_ << #@_ << %####@_
 )}	]
][ 0 ])
  )}}
$_})
__END__
#!end
%(%(puts %(Executing Ruby code...))))