SI-9913 Lead span iterator finishes at state -1

Even if no elements fail the predicate (so that the trailing
iterator is empty).

1 files changed, 6 insertions, 0 deletions

diff --git a/test/junit/scala/collection/IteratorTest.scala b/test/junit/scala/collection/IteratorTest.scala
index d980cadeb3..f18a4de4e9 100644
--- a/test/junit/scala/collection/IteratorTest.scala
+++ b/test/junit/scala/collection/IteratorTest.scala
@@ -164,6 +164,12 @@ class IteratorTest {
     assertEquals(1, y.next)
     assertFalse(x.hasNext)   // was true, after advancing underlying iterator
   }
+  // SI-9913
+  @Test def `span leading iterator finishes at state -1`(): Unit = {
+    val (yes, no) = Iterator(1, 2, 3).span(_ => true)
+    assertFalse(no.hasNext)
+    assertTrue(yes.hasNext)
+  }
   // SI-9623
   @Test def noExcessiveHasNextInJoinIterator: Unit = {
     var counter = 0