diff options
Diffstat (limited to 'tests/pos/t1786-counter.scala')
-rw-r--r-- | tests/pos/t1786-counter.scala | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/pos/t1786-counter.scala b/tests/pos/t1786-counter.scala new file mode 100644 index 000000000..a2431343d --- /dev/null +++ b/tests/pos/t1786-counter.scala @@ -0,0 +1,38 @@ +trait ShapeLevel + +object Fail { + abstract class ProductNodeShape[Level <: ShapeLevel, C, M <: C, U <: C, P <: C] extends Shape[Level, M, U, P] { + def copy(shapes: Seq[Shape[_, _, _, _]]): Shape[Level, _, _, _] + } + + abstract class Shape[Level <: ShapeLevel, -Mixed_, Unpacked_, Packed_] + + final class TupleShape[Level <: ShapeLevel, M <: Product, U <: Product, P <: Product](val shapes: Shape[_, _, _, _]*) extends ProductNodeShape[Level, Product, M, U, P] { + def copy(shapes: Seq[Shape[_, _, _, _]]): Shape[Level, _, _, _] = ??? + } + + trait ShapeLevel +} + +object Ok { + abstract class Shape[Level <: ShapeLevel, -Mixed_, Unpacked_, Packed_] + + abstract class ProductNodeShape[Level <: ShapeLevel, C, M <: C, U <: C, P <: C] extends Shape[Level, M, U, P] { + def copy(shapes: Seq[Shape[_, _, _, _]]): Shape[Level, _, _, _] + } + + final class TupleShape[Level <: ShapeLevel, M <: Product, U <: Product, P <: Product](val shapes: Shape[_, _, _, _]*) extends ProductNodeShape[Level, Product, M, U, P] { + def copy(shapes: Seq[Shape[_, _, _, _]]): Shape[Level, _, _, _] = ??? + } +} + +// This is why we reverted the fix for SI-1786 -- see SI-6169 for a potential alternative that could be extended to cover this. +// both objects type check on 2.10.3, but only Ok was accepted by 2.11 after the original fix to SI-1786. +// Fail results in: +/* +t1786-counter.scala:10: error: class TupleShape needs to be abstract, since method copy in class ProductNodeShape of type (shapes: Seq[Fail.Shape[_, _, _, _]])Fail.Shape[Level, _, _, _] is not defined +(Note that Seq[Fail.Shape[_, _, _, _]] does not match Seq[Fail.Shape[_ <: Fail.ShapeLevel, _, _, _]]: their type parameters differ) + final class TupleShape[Level <: ShapeLevel, M <: Product, U <: Product, P <: Product](val shapes: Shape[_, _, _, _]*) extends ProductNodeShape[Level, Product, M, U, P] { + ^ +one error found +*/ |