plpgsql debugger (pldbg) absent from 8.4?

On the 2009-01-01 win32 release, I noticed I could no longer debug,
like when I'd set a breakpoint I'd immediately get the error message:

syntax error at or near ","
LINE 1: SELECT * FROM pldbg_set_global_breakpoint(, 55208, NULL,
NUL...

...and the output pane of the debugger would show:

row number 0 is out of range 0..-1

Now, I noticed that pldbg.sql was not actually included (even though
lib/pldbgapi.dll and lib/plugins/plugin_debugger.dll are), and I had
been using the one from 8.3 to set it up.  I also noticed that for the
function from the error message it just calls a C function, so I seem
to have no way of working around it with just the .SQL file.

Does anybody have this working on their system?  I hope in the final
8.4 at least that this feature is included again, because I find it
extremely handy.