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class Foo[T <: U, U <: T] // error: illegal cyclic reference: upper bound U of type T refers back to the type itself
class Bar[T >: T] // error: illegal cyclic reference: lower bound T of type T refers back to the type itself
class A {
val x: T = ???
type T <: x.type // error: cyclic reference involving value x
}
class B {
type T <: x.type // error: illegal cyclic reference: upper bound B.this.T(B.this.x) of type T refers back to the type itself
val x: T = ???
}
class C {
final val x: D#T = ???
class D {
type T <: x.type // error: cyclic reference involving value x
val z: x.type = ???
}
}
class E {
class F {
type T <: x.type // old-error: not stable
val z: x.type = ??? // old-error: not stable
}
lazy val x: F#T = ???
}
class T1 {
type X = (U, U) // error: cycle
type U = X & Int
}
class T2 {
type X = (U, U) // error: cycle
type U = X | Int
}
object T12 {
??? : (T1 {})#U // old-error: conflicting bounds
??? : (T2 {})#U // old-error: conflicting bounds
}
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