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Fix sent upstream: https://lore.kernel.org/netfilter-devel/20191031182124.11393-1-phil@nwl.cc/

Issue fixed in upstream commit:

commit 816ce7261bdf9296307bad5cafe79e895f537978
Author: Phil Sutter <phil>
Date:   Sat Nov 16 21:02:07 2019 +0100

    parser_bison: Avoid set references in odd places
    
    With set references being recognized by symbol_expr and that being part
    of primary_expr as well as primary_rhs_expr, they could basically occur
    anywhere while in fact they are allowed only in quite a few spots.
    
    Untangle things a bit by introducing set_ref_expr and adding that only
    in places where it is needed to pass testsuites.
    
    Make sure users can define variables as set references, eg.
    
            define xyz = @setref
    
    And allow to use them from set expressions and statements too.
    
    Signed-off-by: Phil Sutter <phil>
    Signed-off-by: Pablo Neira Ayuso <pablo>


Backported implicitly by rebase to 0.9.3.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1774