Why does this not work for Ruby 1.9.2?

The following code doesn't work with Ruby 1.9.2:

def side_b开发者_高级运维ox(title, &block)
  render :layout => 'layouts/side_box', :locals => {:title => title} do 
    &block
  end
end

I am getting an error:

syntax error, unexpected tAMPER &block

What has changed (since 1.8.7) for this not to work?

---

def side_box(title, &block)
  render :layout => 'layouts/side_box', :locals => {:title => title} do 
    yield
  end
end

or

def side_box(title, &block)
  render :layout => 'layouts/side_box', :locals => {:title => title} do 
    block.call
  end
end

It works in Ruby 1.9 and 1.8.

---

I don't have 1.8.7 installed at the moment, but I'm pretty sure that this is illegal in 1.8.7, as well. The unary prefix & operator is only legal in parameter lists and argument lists.

---

Building on Simone's answer, in case your block takes arguments (arg1, arg2), the correct syntax (in both 1.8 and 1.9) would be

def side_box(title, &block)
  render :layout => 'layouts/side_box', :locals => {:title => title} do 
    yield(arg1, arg2)
  end
end

or

def side_box(title, &block)
  render :layout => 'layouts/side_box', :locals => {:title => title} do 
    block.call(arg1, arg2)
  end
end

---

i didn't know, that this works in 1.8.7, the correct syntax should be

block.call

or

block[]

or

render :layout => 'layouts/side_box', :locals => {:title => title}, &block