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trait T {
def f = 99
}
class C1 extends A with T // error
class C2 extends T with A // error
trait U extends A {
override def f = 999
}
class D1 extends A with U // OK
class D2 extends U with A // OK
class E1 extends A {
def f() = 9999 // need override modifier
}
class E2 extends A {
override def f() = 9999 // OK
}
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