diff options
Diffstat (limited to 'test/files/pos/t0764b.scala')
-rw-r--r-- | test/files/pos/t0764b.scala | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/test/files/pos/t0764b.scala b/test/files/pos/t0764b.scala new file mode 100644 index 0000000000..6ae3c105c9 --- /dev/null +++ b/test/files/pos/t0764b.scala @@ -0,0 +1,61 @@ +// In all cases when calling "prepend" the receiver 'v' +// has static type NodeAlias[A] or (equivalently) Node { type T = A }. +// Since prepend explicitly returns the singleton type of the receiver, +// the return type of prepend in all cases is "v.type", and so the call +// to "new Main" can be parameterized with any of the following, in order +// of decreasing specificity with a tie for second place: +// +// new Main[v.type](v.prepend) +// new Main[NodeAlias[A]](v.prepend) +// new Main[Node { type T = A }](v.prepend) +// new Main(v.prepend) + +// the `fail` comments below denote what didn't compile before SI-8177 fixed all of them + +package p1 { + object t0764 { + type NodeAlias[A] = Node { type T = A } + trait Node { outer => + type T <: Node + def prepend: Node { type T = outer.type } = ??? + } + + class Main1[A <: Node](v: NodeAlias[A]) { + private[this] def f1 = new Main1(v.prepend) // fail + private[this] def f2 = new Main1[NodeAlias[A]](v.prepend) // fail + private[this] def f3 = new Main1[Node { type T = A }](v.prepend) // fail + private[this] def f4 = new Main1[v.type](v.prepend) // ok + } + + class Main2[A <: Node](v: Node { type T = A }) { + private[this] def f1 = new Main2(v.prepend) // fail + private[this] def f2 = new Main2[NodeAlias[A]](v.prepend) // fail + private[this] def f3 = new Main2[Node { type T = A }](v.prepend) // fail + private[this] def f4 = new Main2[v.type](v.prepend) // ok + } + } +} + +package p2 { + object t0764 { + type NodeAlias[A] = Node { type T = A } + trait Node { outer => + type T <: Node + def prepend: NodeAlias[outer.type] = ??? + } + + class Main1[A <: Node](v: NodeAlias[A]) { + private[this] def f1 = new Main1(v.prepend) // ok! <<========== WOT + private[this] def f2 = new Main1[NodeAlias[A]](v.prepend) // fail + private[this] def f3 = new Main1[Node { type T = A }](v.prepend) // fail + private[this] def f4 = new Main1[v.type](v.prepend) // ok + } + + class Main2[A <: Node](v: Node { type T = A }) { + private[this] def f1 = new Main2(v.prepend) // fail + private[this] def f2 = new Main2[NodeAlias[A]](v.prepend) // fail + private[this] def f3 = new Main2[Node { type T = A }](v.prepend) // fail + private[this] def f4 = new Main2[v.type](v.prepend) // ok + } + } +} |