// Test interception of protected assignments by the "assign" method
class foo {
    protected var a;
    protected var b;

    operator := (prop, val) {
        switch (prop) {
        case public::a : self.(prop) = val;
        default :        throw oadl::AccessCheck;
        }
    }
}


proc main()
{
    var x = new foo();
    x.a = 10;
    "x.a assigned to ", x.a, '\n';
    try {
        x.b = 20;
    }
    catch (e) {
        "Assigning to x.b threw ", e, '\n';
    }
}