I tentatively disagree with both of you.

I've sometimes wondered whether code would be universally clearer if all you could do in a loop is have a one-liner or call another function/method (mainly when looking at my own code within loops and thinking WTF!!!).

Would probably cause issues when teaching programming though. It would be interesting to have a compiler switch that enforced this...

What comes to mind immediately is that you would lose the ability to `break` unless you had another convention like returning a specific value to indicate you want to break.

If you are limited to one statement you could still do something along the lines of the following (no particular language):

  foreach ( $item in $list )
  {
    if ( 1 == some_function( $item ) )
    {
      continue;
    }
    else
    if ( 2 == some_function( $item ) )
    {
      break;
    }
    else
    {
      another_function( $item );
    }
  }

But I would immediately concede that it is starting to miss the entire point of why it was enforced in the first place...

I actually like this style (or similar if not quite as extreme). I find it's much clearer what's going on.