[libc++][test] Close LWG3382 and add tests (#93039)

Author: huixie90

libcxx/docs/Status/Cxx20Issues.csv

@@ -285,7 +285,7 @@
 "`3379 <https://wg21.link/LWG3379>`__","""``safe``\ "" in several library names is misleading","Prague","|Complete|","15.0","|ranges|"
 "`3380 <https://wg21.link/LWG3380>`__","``common_type``\  and comparison categories","Prague","|Complete|","15.0","|spaceship|"
 "`3381 <https://wg21.link/LWG3381>`__","``begin``\  and ``data``\  must agree for ``contiguous_range``\ ","Prague","|Nothing To Do|","","|ranges|"
-"`3382 <https://wg21.link/LWG3382>`__","NTTP for ``pair``\  and ``array``\ ","Prague","",""
+"`3382 <https://wg21.link/LWG3382>`__","NTTP for ``pair``\  and ``array``\ ","Prague","|Nothing To Do|",""
 "`3383 <https://wg21.link/LWG3383>`__","|sect|\ [time.zone.leap.nonmembers] ``sys_seconds``\  should be replaced with ``seconds``\ ","Prague","|Complete|","19.0","|chrono|"
 "`3384 <https://wg21.link/LWG3384>`__","``transform_view::*sentinel*``\  has an incorrect ``operator-``\ ","Prague","|Complete|","15.0","|ranges|"
 "`3385 <https://wg21.link/LWG3385>`__","``common_iterator``\  is not sufficiently constrained for non-copyable iterators","Prague","|Complete|","15.0","|ranges|"

libcxx/test/std/containers/sequences/array/lwg3382.compile.pass.cpp

@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <array>
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+#include <array>
+
+template <auto>
+struct Test {};
+
+void test() {
+  // LWG 3382. NTTP for pair and array
+  // https://cplusplus.github.io/LWG/issue3382
+  constexpr std::array<int, 5> a{};
+  [[maybe_unused]] Test<a> test1{};
+
+  constexpr std::array<int, 0> b{};
+  [[maybe_unused]] Test<b> test2{};
+}

libcxx/test/std/utilities/utility/pairs/pairs.pair/lwg3382.compile.pass.cpp

@@ -0,0 +1,23 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+#include <utility>
+
+template <auto>
+struct Test {};
+
+void test() {
+  // LWG 3382. NTTP for pair and array
+  // https://cplusplus.github.io/LWG/issue3382
+#if !defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
+  constexpr std::pair<int, long> a{};
+  [[maybe_unused]] Test<a> test1{};
+#endif
+}