Undocumented feature of display filter macros?

[Jakub Zawadzki <darkjames () darkjames ath cx>]

Hi,

I'm playing a little with wireshark internals and I found that it's
possible to make filters like:
   tcp.stream == ${tcp.stream} <-- filter current selected stream
   ip.addr == ${ip.src}        <-- find packets containing source address.

It's quite nice feature, but I couldn't find any documentation for it ;/

I only found general information about macros:
  http://www.wireshark.org/docs/wsug_html_chunked/ChDisplayFilterMacrosSection.html
  http://wiki.wireshark.org/DFilterMacro 

and proposal of this feature:
  http://www.wireshark.org/lists/wireshark-dev/200707/msg00314.html

any links?
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