filter all prefixes except a few with 'case' control

[Войнович Андрей Александрович]

Hi all!

I try to implement simple filter which rejects all prefixes except a few with 
'case' control this way:

filter permit_white {
        case net {
                1.1.1.1/32: accept;
                2.2.2.2/32: accept;
                else: reject;
        }
}

But syntax check fails on line '1.1.1.1/32: accept;'. I read everything on 
Internet what was found, but cannot understand what is wrong.

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