Combinational

If a variable is assigned in always_comb declaration, it means combinational circuit.

module ModuleA {
    let a: logic<10> = 1;
    var b: logic<10>;

    always_comb {
        b = a + 1;
    }
}

Concatenation can be used as the left hand side in always_comb declaration.

module ModuleA {
    var a: logic<10>;
    var b: logic<10>;

    always_comb {
        {a, b} = 1;
    }
}