testing v3b, getting error @ launch "Expected ';' ...". syntax?

[d1+varnish at postinbox.com]

i've installed to test,

varnishd -V
	varnishd (varnish-3.0.0-beta1 revision 5e2c77b)
	Copyright (c) 2006-2009 Linpro AS / Verdens Gang AS


at varnish launch,

Message from VCC-compiler:
Expected ';' got '", "'
(program line 174), at
('/etc/varnish/vcl.svr1.conf' Line 90 Pos 42)
                req.http.X-forwarded-For ", "
-----------------------------------------####

Running VCC-compiler failed, exit 1

VCL compilation failed


where, in 

/etc/varnish/vcl.svr1.conf

		if (req.http.X-Forwarded-For) {
		        set req.http.X-forwarded-For =
	90              req.http.X-forwarded-For ", "
		        regsub(client.ip, ":.*", "");
		    }

as the stanza's find in v2.1.5x, reading v3's doc/changes.rst, i suspect
i'm missing/misunderstanding a syntax change.

is this the relevant stmt,

  - Change ``req.hash += value`` to ``hash_data(value)``

&/or what's the issue with the stanza above?

thx.