[libc++][test] std::variant test cleanup

* Add the conventional `return 0` to `main` in `variant.assign/conv.pass.cpp` and `variant.ctor/conv.pass.cpp`

* Fix some MSVC signed-to-unsigned conversion warnings by replacing `int` literarls with `unsigned int` literals

llvm-svn: 374723

6 files changed, 7 insertions, 5 deletions

diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/conv.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/conv.pass.cpp
index a1d9122a8c3..b723263d144 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/conv.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/conv.pass.cpp
@@ -40,4 +40,5 @@ int main(int, char**)
   static_assert(!std::is_assignable<std::variant<bool>, std::unique_ptr<char> >::value, "");
   static_assert(!std::is_assignable<std::variant<bool>, decltype(nullptr)>::value, "");
 
+  return 0;
 }
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
index 820d81e71e6..07ca63f2363 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
@@ -453,7 +453,7 @@ void test_copy_assignment_different_index() {
   {
     using V = std::variant<int, CopyAssign, unsigned>;
     CopyAssign::reset();
-    V v1(std::in_place_type<unsigned>, 43);
+    V v1(std::in_place_type<unsigned>, 43u);
     V v2(std::in_place_type<CopyAssign>, 42);
     assert(CopyAssign::copy_construct == 0);
     assert(CopyAssign::move_construct == 0);
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
index 7ec76ab4ccc..b70f7aa6bf3 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
@@ -462,7 +462,7 @@ void test_move_assignment_different_index() {
     struct {
       constexpr Result<long> operator()() const {
         using V = std::variant<int, TMoveAssign, unsigned>;
-        V v(std::in_place_type<unsigned>, 43);
+        V v(std::in_place_type<unsigned>, 43u);
         V v2(std::in_place_type<TMoveAssign>, 42);
         v = std::move(v2);
         return {v.index(), std::get<1>(v).value};
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/conv.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/conv.pass.cpp
index c0b1560a8f6..de3def4f109 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/conv.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/conv.pass.cpp
@@ -38,5 +38,6 @@ int main(int, char**)
   static_assert(!std::is_constructible<std::variant<bool>, std::true_type>::value, "");
   static_assert(!std::is_constructible<std::variant<bool>, std::unique_ptr<char> >::value, "");
   static_assert(!std::is_constructible<std::variant<bool>, decltype(nullptr)>::value, "");
-  
+
+  return 0;
 }
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
index 07a70e4e8ef..b09e35762a2 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
@@ -145,7 +145,7 @@ void test_basic() {
     assert(&std::get<3>(v) == &z);
     assert(&ref4 == &std::get<3>(v));
     // emplace with multiple args
-    auto& ref5 = v.emplace<5>(3, 'a');
+    auto& ref5 = v.emplace<5>(3u, 'a');
     static_assert(std::is_same_v<std::string&, decltype(ref5)>, "");
     assert(std::get<5>(v) == "aaa");
     assert(&ref5 == &std::get<5>(v));
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
index 9eaddcc672c..e0a048a1afb 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
@@ -145,7 +145,7 @@ void test_basic() {
     assert(&std::get<int &&>(v) == &z);
     assert(&ref4 == &std::get<int &&>(v));
     // emplace with multiple args
-    auto& ref5 = v.emplace<std::string>(3, 'a');
+    auto& ref5 = v.emplace<std::string>(3u, 'a');
     static_assert(std::is_same_v<std::string&, decltype(ref5)>, "");
     assert(std::get<std::string>(v) == "aaa");
     assert(&ref5 == &std::get<std::string>(v));