This code compiles in with JDK 23 b 26 with disabled preview:

class clss21717_b {
    int field1 = 666;

    clss21717_b(int arg) {
        field1 = arg;
    }
}

class clss21717_a extends clss21717_b {
    int field2;

    clss21717_a() {
        super(field2 = 1); //supposed to fall here
    }
}

JEP 482 allows such assignment, but JEP 482 is a preview feature. This code should fail in non-preview mode, which it does with JDKb25 but does not with JDKb26.