How ensure/return breaks throw/catch

throw-catch.rb

def run_with_elapsed_time
  time_at_start = Time.now
  exception = nil
  result = yield
rescue => e
  exception = e
ensure
  return [ result, exception, Time.now - time_at_start ]
end

def wrap(&block)
  result, exception, elapsed = run_with_elapsed_time(&block)

  status = "run in #{elapsed} seconds"
  
  if exception
    puts "#{status} and raised #{exception}"
    raise exception
  else
    puts "#{status} and returned #{result}"
    result
  end
end

it "throw/catch normally" do
  value = catch(:value) do
    throw :value, 123
    this_is_never_run
  end

  expect(value).to eq(123)
end

it "interrupts throw/catch" do
  value = catch(:value) do
    wrap do
      throw :value, 123
      this_is_still_not_run
    end
  end

  # this fails with value=nil :(
  expect(value).to eq(123)
end