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def a_method(a = 0)
  raise unless block_given?
  puts yield(0)
  puts yield(a)
  b_method(a) { yield(a) + 1 }
rescue
  puts "Error (on #{__method__})"
end

def b_method(a)
  raise unless block_given?
  puts yield(a)
  yield(a) + 1
rescue
  puts "Error (on #{__method__})"
end

p a_method(1) { |x| x + 1 }
p a_method(1) { |x| x + 5 }
=begin
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8
=end