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def foo
$b0 = binding
x,y = 1,1
$b1 = binding
1.times { |a;x|
x = 2
z = 1
$b2 = binding
1.times { |a|
eval('x = 4')
eval('u = 1')
$b4 = binding
}
}
1.times { |a;x|
x = 3
$b3 = binding
}
end
foo
puts 'x:'
eval('p x',$b0)
eval('p x',$b1)
eval('p x',$b2)
eval('p x',$b3)
eval('p x',$b4)
puts
puts 'y:'
eval('p y',$b0)
eval('p y',$b1)
eval('p y',$b2)
eval('p y',$b3)
eval('p y',$b4)
puts
puts 'z:'
eval('p z rescue puts $!',$b0)
eval('p z rescue puts $!',$b1)
eval('p z',$b2)
eval('p z rescue puts $!',$b3)
eval('p z rescue puts $!',$b4)
puts
puts 'u:'
eval('p u rescue puts $!',$b0)
eval('p u rescue puts $!',$b1)
eval('p u rescue puts $!',$b2)
eval('p u rescue puts $!',$b3)
eval('p u rescue puts $!',$b4)
puts
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