Fixes #1477 by requiring that abstract types wi...

Fixes #1477 by requiring that abstract types with non-volatile upper
bounds cannot be overridden by volatile types.

1 files changed, 9 insertions, 0 deletions

diff --git a/test/files/neg/t2179.check b/test/files/neg/t2179.check
new file mode 100644
index 0000000000..e454e117b5
--- /dev/null
+++ b/test/files/neg/t2179.check
@@ -0,0 +1,9 @@
+t2179.scala:2: error: inferred type arguments [scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]{def sameElements[B >: Any](that: Iterable[B]): Boolean}]; def reverse: scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; protected def thisCollection: Seq[Double]{def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}; def dropRight(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def takeRight(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def slice(start: Int,end: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def take(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def drop(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}}] do not conform to method reduceLeft's type parameter bounds [B >: List[Double]]
+  (Nil:List[List[Double]]).reduceLeft((_: Any, _: Any) => Nil.indices.map(_ => 0d))
+                           ^
+t2179.scala:2: error: type mismatch;
+ found   : (Any, Any) => scala.collection.immutable.IndexedSeq[Double]
+ required: (scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]{def sameElements[B >: Any](that: Iterable[B]): Boolean}]; def reverse: scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; protected def thisCollection: Seq[Double]{def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}; def dropRight(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def takeRight(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def slice(start: Int,end: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def take(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def drop(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}}, List[Double]) => scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]{def sameElements[B >: Any](that: Iterable[B]): Boolean}]; def reverse: scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; protected def thisCollection: Seq[Double]{def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}; def dropRight(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def takeRight(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def slice(start: Int,end: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def take(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}; def drop(n: Int): scala.collection.immutable.Seq[Double]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq[Any]]}}
+  (Nil:List[List[Double]]).reduceLeft((_: Any, _: Any) => Nil.indices.map(_ => 0d))
+                                                       ^
+two errors found