Previous: New Tracing, Up: Tracing
The newer tracing mechanism is more general and so more powerful than
the older one: it works for expressions as well as procedure
applications, and it implements the useful trace-subtree
behaviour as well as the more traditional trace-here
.
The older mechanism will probably become obsolete eventually, but it's worth keeping it around for a while until we are sure that the new mechanism is correct and does what programmers need.