comparing stick-table values in acl

[Björn Jacke]

Hi,

I would like to compare two different stick-table values in an ACL. What 
I tried to do was an obvious comparison like this:

http-request deny if { sc_conn_rate(0) le sc_http_req_rate(1) }

but this results in:

[ALERT] 340/213554 (9804) : parsing [/etc/haproxy/haproxy.cfg:203] : 
error detected while parsing an 'http-request deny' condition : 
'sc_http_req_rate(1)' is neither a number nor a supported operator.

is that an intended limitations that are there no variables allowed on 
the right hand side here? Is there a different way to do something like 
this?

Thanks
Björn