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token infix:sym<?? !!> ( --> Conditional) {
    '??'
...
    ]
    {*}                                                         #= ?? 
+!!
}

token infix:sym<?? !!> {
    '??'
    <EXPR(%conditional)>
    '!!'
}

$a == 1 ?? $b = 2 !! $b = 3;

EXPR INFIX EXPR LEFT_DELIM STRING RIGHT_DELIM

for 1..10 { ... }