rescue_in_block.rb

class E < StandardError; end

def m(raise_exception)
  y do
    r(raise_exception)
    :nothing_raised
  end
rescue E
  :rescued
end

def n(raise_exception)
  y do
    begin
      r(raise_exception)
      :nothing_raised
    rescue E
      :rescued
    end
  end
end

def r(raise_exception)
  raise E if raise_exception
end

def y
  yield
end

m(true)  # => :rescued
m(!true) # => :nothing_raised

n(true)  # => :rescued
n(!true) # => :nothing_raised