Merge pull request #4544 from dotty-staging/fix-801

Add testcase for issue 801 (already fixed)

Author: allanrenucci

tests/pos/i801.scala

@@ -0,0 +1,9 @@
+object T1 {
+  import java.util.ArrayList, java.util.stream.{Stream => JStream}
+  new java.util.ArrayList[String]().stream.map(_.toInt).map(_.toString): JStream[String]
+}
+
+object T2 {
+  import java.util._, java.util.stream.{Stream => JStream}
+  def f: JStream[String] = new java.util.ArrayList[String](Arrays.asList("1", "2")).stream.map(_.toInt).map(_.toString)
+}