p6.p6

    rule statement_control:sym<unless> {
        $<sym>='unless'<.kok>  
        <xblock(0)> # 0 means we're not parsing `without`
        [ <!before [els[e|if]|orwith]» >
            || $<wrong-keyword>=[els[e|if]|orwith]» {}
                <.typed_panic: 'X::Syntax::UnlessElse',
                    keyword => ~$<wrong-keyword>,
                >
        ]
    }