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File: //lib/ruby/gems/3.0.0/gems/typeprof-0.12.0/smoke/flow1.rb
def foo(n)
  if n.is_a?(Integer)
    n + 1
  else
    n + "STR"
  end
end

foo(42)
foo("str")

__END__
# Classes
class Object
  private
  def foo: (Integer | String n) -> (Integer | String)
end