Revert attempt to limit private types in lubs.

Has to be somewhere more directly tied to structural
refinements.  See run/lub-visibility.scala before/after
output for motivation.  Closes SI-5534.

4 files changed, 84 insertions, 1 deletions

diff --git a/src/compiler/scala/reflect/internal/Types.scala b/src/compiler/scala/reflect/internal/Types.scala
index 0a9449226b..64edbdb8bd 100644
--- a/src/compiler/scala/reflect/internal/Types.scala
+++ b/src/compiler/scala/reflect/internal/Types.scala
@@ -5846,7 +5846,7 @@ trait Types extends api.Types { self: SymbolTable =>
       }
     }
 
-    val initialBTSes = ts map (_.baseTypeSeq.toList filter (_.typeSymbol.isPublic))
+    val initialBTSes = ts map (_.baseTypeSeq.toList)
     if (printLubs)
       printLubMatrix(ts zip initialBTSes toMap, depth)
 
diff --git a/test/files/pos/t5534.scala b/test/files/pos/t5534.scala
new file mode 100644
index 0000000000..39682a2fff
--- /dev/null
+++ b/test/files/pos/t5534.scala
@@ -0,0 +1,61 @@
+package philips.adolf.paul
+
+trait Sys[ S <: Sys[ S ]] {
+  type Tx
+}
+
+object HASkipList {
+  sealed trait NodeLike[ S <: Sys[ S ], @specialized( Int ) A ] {
+    def size : Int
+    def key( i: Int ): A
+  }
+  sealed trait Node[ S <: Sys[ S ], @specialized( Int ) A ] extends NodeLike[ S, A ] {
+    def isLeaf   : Boolean
+    def isBranch : Boolean
+    def asBranch : Branch[ S, A ]
+  }
+  sealed trait BranchLike[ S <: Sys[ S ], @specialized( Int ) A ] extends NodeLike[ S, A ] {
+    def down( i: Int )( implicit tx: S#Tx ) : Node[ S, A ] = sys.error("")
+  }
+  sealed trait HeadOrBranch[ S <: Sys[ S ], A ]
+  final class Branch[ S <: Sys[ S ], @specialized( Int ) A ]()
+  extends BranchLike[ S, A ] with HeadOrBranch[ S, A ] with Node[ S, A ] {
+    def size:Int=1234
+    def key(i: Int):A=sys.error("TODO")
+    def isLeaf   : Boolean = false
+    def isBranch : Boolean = true
+    def asBranch : Branch[ S, A ] = this
+  }
+}
+sealed trait HASkipList[ S <: Sys[ S ], @specialized( Int ) A ] 
+
+class HASkipListView[ S <: Sys[ S ], A ]( private val l: HASkipList[ S, A ])( implicit system: S ) {
+  import HASkipList.Node
+  private def buildBoxMap( n: Node[ S, A ], isRight: Boolean )( implicit tx: S#Tx ) : (Box, NodeBox) = {
+    val sz = n.size
+    val szm = sz - 1
+    val keys = IndexedSeq.tabulate( sz ) { i =>
+      val key     = n.key( i )
+      (key, if( isRight && i == szm ) "M" else key.toString)
+    }
+    val chbo = if( n.isLeaf ) None else {
+      val nb = n.asBranch
+      Some( IndexedSeq.tabulate( sz )( i => buildBoxMap( nb.down( i ), isRight && (i == szm) )))
+    }
+    val b    = NodeBox( n, keys, chbo.map( _.map( _._2 )))
+    val bb   = chbo match {
+      case Some( chbt ) =>
+        val chb  = chbt.map( _._1 )
+        val h    = Horiz( bs = chb )
+        Vert( bs = IndexedSeq[Box]( b, h ))
+      case None => b
+    }
+
+    (bb, b)
+  }
+
+  private trait Box
+  private case class Horiz( spacing: Int = 20, bs: IndexedSeq[ Box ]) extends Box
+  private final case class Vert( spacing: Int = 20, bs: IndexedSeq[ Box ]) extends Box
+  private final case class NodeBox( n: Node[ S, A ], keys: IndexedSeq[ (A, String) ], downs: Option[ IndexedSeq[ NodeBox ]]) extends Box
+}
diff --git a/test/files/run/lub-visibility.check b/test/files/run/lub-visibility.check
new file mode 100644
index 0000000000..3461d1bf6b
--- /dev/null
+++ b/test/files/run/lub-visibility.check
@@ -0,0 +1,14 @@
+Type in expressions to have them evaluated.
+Type :help for more information.
+
+scala> 
+
+scala> // should infer List[scala.collection.immutable.Seq[Nothing]]
+
+scala> // but reverted that for SI-5534.
+
+scala> val x = List(List(), Vector())
+x: List[scala.collection.immutable.Seq[Nothing] with scala.collection.AbstractSeq[Nothing]{def companion: scala.collection.generic.GenericCompanion[scala.collection.immutable.Seq with scala.collection.AbstractSeq{def dropRight(n: Int): scala.collection.immutable.Seq[Any] with scala.collection.AbstractSeq[Any]; def takeRight(n: Int): scala.collection.immutable.Seq[Any] with scala.collection.AbstractSeq[Any]; def drop(n: Int): scala.collection.immutable.Seq[Any] with scala.collection.AbstractSeq[Any]; def take(n: Int): scala.collection.immutable.Seq[Any] with scala.collection.AbstractSeq[Any]; def slice(from: Int,until: Int): scala.collection.immutable.Seq[Any] with scala.collection.AbstractSeq[Any]}]; def dropRight(n: Int): scala.collection.immutable.Seq[Nothing] with scala.collection.Ab...
+scala> 
+
+scala> 
diff --git a/test/files/run/lub-visibility.scala b/test/files/run/lub-visibility.scala
new file mode 100644
index 0000000000..8d5d3ae11a
--- /dev/null
+++ b/test/files/run/lub-visibility.scala
@@ -0,0 +1,8 @@
+import scala.tools.partest.ReplTest
+object Test extends ReplTest {
+  def code = """
+    |// should infer List[scala.collection.immutable.Seq[Nothing]]
+    |// but reverted that for SI-5534.
+    |val x = List(List(), Vector())
+  """.stripMargin
+}