procs.rb

def foo(&block)
  p [:foo, 1]
  block.call
  p [:foo, 2]
end

def bar(&block)
  p [:bar, 1]
  foo(&block)
  p [:bar, 2]
end

def baz
  p [:baz, 1]
  bar { return }
  p [:baz, 2]
end

baz