+2021-11-01 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-11-01 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103022
+ * include/std/valarray (begin, end): Do not dereference an empty
+ valarray. Add noexcept and [[nodiscard]].
+ * testsuite/26_numerics/valarray/range_access.cc: Check empty
+ valarray. Check iterator properties. Run as well as compiling.
+ * testsuite/26_numerics/valarray/range_access2.cc: Likewise.
+ * testsuite/26_numerics/valarray/103022.cc: New test.
+
2021-10-19 Jonathan Wakely <jwakely@redhat.com>
Backported from master: