2.4.x/modules/core/test/conf/test56.conf

# nesting warnings
<Macro Open $dir>
  <Directory $dir>
    Warning "Open:2 $dir"
</Macro>
<Macro Close>
    Warning "Close:1"
  </Directory>
</Macro>

# some uses
Use Open /tmp
Use Close

Use Open /etc
Use Close

Error "done line 18."