anchor.diff:  indenting.  Although the indenting is not strictly necessary, it would
   make the output a lot more readable.
   
  -The test depth is kept track of for us with the `breadcrumb` object in
  -the `TestReporter` structure.  We'll add an `indent()` function that
  +Given that the test depth is kept track of for us with the
  +`breadcrumb` object in the `TestReporter` structure, indentation will
  +actually be quite simple.  We'll add an `indent()` function that
   outputs the correct number of tabs...
   
   [source,c]
  
positive.code: include::tutorial_src/test_as_xml1.out[]
  -----------------------
  
  We don't require a message for passing tests, so the `show_fail()`
  function is all we need...
  
  [source,c]
  
negative.code: 
  Yep, nothing.
  
  Let's add the outer XML tags first, so that we can see *Cgreen*
  navigating the test suite...
  
  [source,c]
  