Fixed a bug SI-5377 (https://issues.scala-lang.org/browse/SI-5377).

Added test cases for SI-5377.

1 files changed, 47 insertions, 0 deletions

diff --git a/test/files/run/t5377.scala b/test/files/run/t5377.scala
new file mode 100644
index 0000000000..2e8fb1a6af
--- /dev/null
+++ b/test/files/run/t5377.scala
@@ -0,0 +1,47 @@
+object Test {
+  def testPermutations1(num: Int, stream: Stream[Int]): Unit = {
+    val perm = stream.permutations
+    print(num)
+    while(perm.hasNext) {
+      print(" " + perm.next().toList)
+    }
+    println()
+  }
+  def testPermutations2(num: Int, stream: List[Int]): Unit = {
+    val perm = stream.permutations
+    print(num)
+    while(perm.hasNext) {
+      print(" " + perm.next().toList)
+    }
+    println()
+  }
+
+  def main(args: Array[String]): Unit = {
+    testPermutations1(1, Stream(1))
+    testPermutations2(1, List(1))
+
+    testPermutations1(2, Stream(1, 2))
+    testPermutations2(2, List(1, 2))
+
+    testPermutations1(2, Stream(2, 1))
+    testPermutations2(2, List(2, 1))
+
+    testPermutations1(3, Stream(1, 2, 3))
+    testPermutations2(3, List(1, 2, 3))
+
+    testPermutations1(3, Stream(1, 3, 2))
+    testPermutations2(3, List(1, 3, 2))
+
+    testPermutations1(3, Stream(2, 1, 3))
+    testPermutations2(3, List(2, 1, 3))
+
+    testPermutations1(3, Stream(2, 3, 1))
+    testPermutations2(3, List(2, 3, 1))
+
+    testPermutations1(3, Stream(3, 1, 2))
+    testPermutations2(3, List(3, 1, 2))
+
+    testPermutations1(3, Stream(3, 2, 1))
+    testPermutations2(3, List(3, 2, 1))
+  }
+}