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Diffstat (limited to 'test/pending/pos/ticket2251.scala')
-rw-r--r-- | test/pending/pos/ticket2251.scala | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/pending/pos/ticket2251.scala b/test/pending/pos/ticket2251.scala new file mode 100644 index 0000000000..7b6efb0ea0 --- /dev/null +++ b/test/pending/pos/ticket2251.scala @@ -0,0 +1,25 @@ + +// Martin: I am not sure this is a solvable problem right now. I'll leave it in pending. +// derived from pos/bug1001 +class A +trait B[T <: B[T]] extends A +class C extends B[C] +class D extends B[D] + +class Data { + // force computing lub of C and D (printLubs enabled:) + +/* +lub of List(D, C) at depth 2 + lub of List(D, C) at depth 1 + lub of List(D, C) at depth 0 + lub of List(D, C) is A + lub of List(D, C) is B[_1] forSome { type _1 >: D with C <: A } +lub of List(D, C) is B[_2] forSome { type _2 >: D with C{} <: B[_1] forSome { type _1 >: D with C{} <: A } } +*/ +// --> result = WRONG + + // should be: B[X] forSome {type X <: B[X]} -- can this be done automatically? for now, just detect f-bounded polymorphism and fall back to more coarse approximation + + val data: List[A] = List(new C, new D) +} |