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This (somewhat convoluted) code fails to compile
class A[+U>:Null] {
type R[+X>:Null] = X type O[+X] = A[R[X]]
}
with the following error:
type arguments [A.this.R[X]] do not conform to class A's type parameter bounds [+U >: Null]
However, because type R[+X>:Null] is identical to X, it should carry X bounds and R[X] lower bound should be known to be X's lower bound, i.e. Null.
The same problem occurs with upper bounds.
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