[libc++] Move a bunch of tests from libcxx/test/libcxx to libcxx/test/std (#150199)

These tests test standard behaviour, so they shouldn't be in the
libc++-specific tests.

Author: philnik777

libcxx/test/libcxx/containers/sequences/forwardlist/bool-conversion.pass.cpp

@@ -69,6 +69,25 @@ TEST_CONSTEXPR_CXX26 bool test() {
   test<std::forward_list<long>>();
   test<std::forward_list<double>>();
 
+  { // Ensure that the result of operator== is converted to bool
+    // See LWG4135.
+    struct Bool {
+      Bool()            = default;
+      Bool(const Bool&) = delete;
+      operator bool() const { return true; }
+    };
+
+    struct Int {
+      Bool& operator==(Int) const {
+        static Bool b;
+        return b;
+      }
+    };
+
+    std::forward_list<Int> l;
+    std::erase(l, Int{});
+  }
+
   return true;
 }
 

libcxx/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp

@@ -127,9 +127,9 @@ TEST_CONSTEXPR_CXX20 void emplaceable_concept_tests() {
 }
 
 void test_ctor_under_alloc() {
-#if TEST_STD_VER >= 11
   int arr1[] = {42};
   int arr2[] = {1, 101, 42};
+#if TEST_STD_VER >= 11
   {
     using C  = TCT::vector<>;
     using It = forward_iterator<int*>;
@@ -155,6 +155,35 @@ void test_ctor_under_alloc() {
     }
   }
 #endif
+  // FIXME: This is mostly the same test as above, just worse. They should be merged.
+  {
+    typedef std::vector<int, cpp03_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3);
+      assert(Alloc::construct_called);
+    }
+  }
+  {
+    typedef std::vector<int, cpp03_overload_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3);
+      assert(Alloc::construct_called);
+    }
+  }
 }
 
 // In C++03, you can't instantiate a template with a local type.

libcxx/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp

@@ -141,9 +141,9 @@ TEST_CONSTEXPR_CXX20 void emplaceable_concept_tests() {
 }
 
 void test_ctor_under_alloc() {
-#if TEST_STD_VER >= 11
   int arr1[] = {42};
   int arr2[] = {1, 101, 42};
+#if TEST_STD_VER >= 11
   {
     using C     = TCT::vector<>;
     using It    = forward_iterator<int*>;
@@ -173,6 +173,37 @@ void test_ctor_under_alloc() {
     }
   }
 #endif
+  // FIXME: This is mostly the same test as above, just worse. They should be merged.
+  {
+    typedef std::vector<int, cpp03_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    Alloc a;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1, a);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3, a);
+      assert(Alloc::construct_called);
+    }
+  }
+  {
+    typedef std::vector<int, cpp03_overload_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    Alloc a;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1, a);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3, a);
+      assert(Alloc::construct_called);
+    }
+  }
 }
 
 TEST_CONSTEXPR_CXX20 bool test() {