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class Test {
type T[X]
type U[X] = T[X]
type V[X] >: T[X]
type W[X] >: T[X] <: T[X]
def f[C[X] >: T[X]](x: C[Int]) = ???
val v: V[Int] = ???
val t: T[Int] = ???
f[V](v)
f[V](t)
}
class Test2 {
class T[X]
type U[X] = T[X]
type V[X] >: T[X]
type W[X] >: T[X] <: T[X]
def f[C[X] >: T[X]](x: C[Int]) = ???
val v: V[Int] = ???
val t: T[Int] = ???
f[V](v)
f[V](t)
var x: V[Int] = _
x = t
}
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