Proc (block) and function scoping are different. wat.

scope.rb

def printer x
  def helper
    puts x
  end
  helper
end

printer "test" # NameError: undefined local variable or method `x' for main:Object

def printer x
  helper = Proc.new do
    puts x
  end
  helper.call
end

printer "test" # test. It works!

# Nested function definitions do not capture variables from the outer scope, but Procs (blocks) do. Why, Ruby, why?

Why is it useful for a block to capture variables, but not for an inner function?