Fix crash when IntervalMapOverlaps::advanceTo moves past the last overlap.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122081 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/IntervalMapTest.cpp b/unittests/ADT/IntervalMapTest.cpp
index e0d95a1..eb1f1a4 100644
--- a/unittests/ADT/IntervalMapTest.cpp
+++ b/unittests/ADT/IntervalMapTest.cpp
@@ -586,7 +586,11 @@
ASSERT_TRUE(BA.valid());
EXPECT_EQ(3u, BA.a().start());
EXPECT_EQ(4u, BA.b().start());
- ++BA;
+ // advance past end.
+ BA.advanceTo(6);
+ EXPECT_FALSE(BA.valid());
+ // advance an invalid iterator.
+ BA.advanceTo(7);
EXPECT_FALSE(BA.valid());
}