split_block.rb

def wrapper_method
  puts "* SETUP *"
  yield
  puts "* TEARDOWN *"
end

f = Fiber.new do
  wrapper_method do
    Fiber.yield
  end
end

puts "Resuming f..."
f.resume

puts "f yielded. Now we are between SETUP and TEARDOWN."

puts "Resuming f again..."
f.resume

{output}

→ ruby split_block.rb
Resuming f...
* SETUP *
f yielded. Now we are between SETUP and TEARDOWN.
Resuming f again...
* TEARDOWN *