Rooting out more undefined behavior in char_traits.

llvm-svn: 229119

1 files changed, 2 insertions, 0 deletions

diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp
index 1ef44635158..4f66d2c2cad 100644
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp
@@ -25,5 +25,7 @@ int main()
     assert(s2[0] == char16_t(1));
     assert(s2[1] == char16_t(2));
     assert(s2[2] == char16_t(3));
+    assert(std::char_traits<char16_t>::copy(NULL, s1, 0) == NULL);
+    assert(std::char_traits<char16_t>::copy(s1, NULL, 0) == s1);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
 }