Test.rb

animals = ["dog", "cat", "chicken", "shark"]

if 2 + 2 == 5 #obviously this condition will never be true
  # at this point, animal is still undefined
  animal = "frog"
  puts animal
else
  # animal is now defined as nil, rather than
  # being undefined or defined as "frog"
  puts(animals.find { |animal| animal.length == 5})
  # Rubocop will cite me here for shadowing, becuase it considers animal to
  # still be defined.
end

# to see only the relevant offense, run the line below in a terminal:
# rubocop Test.rb --only Lint