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