From dc6b91822f695250938ee06ad21818b1ca8a778d Mon Sep 17 00:00:00 2001
From: Som Snytt <som.snytt@gmail.com>
Date: Mon, 5 Sep 2016 21:59:08 -0700
Subject: SI-9913 Lead span iterator finishes at state -1

Even if no elements fail the predicate (so that the trailing
iterator is empty).
---
 test/junit/scala/collection/IteratorTest.scala | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'test')

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
-- 
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