diff --git a/include/meta/meta_fwd.hpp b/include/meta/meta_fwd.hpp
index cc64ce263b..a2f5e6ff8b 100644
--- a/include/meta/meta_fwd.hpp
+++ b/include/meta/meta_fwd.hpp
@@ -147,7 +147,7 @@
 #if __cpp_concepts <= 201507L
 #define META_CONCEPT concept bool
 // TS concepts subsumption barrier for atomic expressions
-#define META_CONCEPT_BARRIER(...) ::meta::detail::bool_<__VA_ARGS__>
+#define META_CONCEPT_BARRIER(...) ::meta::detail::barrier<__VA_ARGS__>
 #else
 #define META_CONCEPT concept
 #define META_CONCEPT_BARRIER(...) __VA_ARGS__
@@ -267,7 +267,7 @@ namespace meta
     namespace detail
     {
         template <bool B>
-        META_INLINE_VAR constexpr bool bool_ = B;
+        META_INLINE_VAR constexpr bool barrier = B;
 
         template <class T, T> struct require_constant; // not defined
     }
diff --git a/include/range/v3/detail/config.hpp b/include/range/v3/detail/config.hpp
index b956f11eec..81f06553d4 100644
--- a/include/range/v3/detail/config.hpp
+++ b/include/range/v3/detail/config.hpp
@@ -210,6 +210,8 @@ namespace ranges
 #define RANGES_DIAGNOSTIC_IGNORE_DIVIDE_BY_ZERO RANGES_DIAGNOSTIC_IGNORE(4723 4724)
 #define RANGES_DIAGNOSTIC_IGNORE_UNSIGNED_MATH RANGES_DIAGNOSTIC_IGNORE(4146)
 #define RANGES_DIAGNOSTIC_IGNORE_TRUNCATION RANGES_DIAGNOSTIC_IGNORE(4244)
+#define RANGES_DIAGNOSTIC_IGNORE_MULTIPLE_ASSIGNMENT_OPERATORS \
+    RANGES_DIAGNOSTIC_IGNORE(4522)
 
 #define RANGES_CXX_VER _MSVC_LANG
 
@@ -309,6 +311,7 @@ namespace ranges
 #define RANGES_DIAGNOSTIC_IGNORE_DIVIDE_BY_ZERO
 #define RANGES_DIAGNOSTIC_IGNORE_UNSIGNED_MATH
 #define RANGES_DIAGNOSTIC_IGNORE_TRUNCATION
+#define RANGES_DIAGNOSTIC_IGNORE_MULTIPLE_ASSIGNMENT_OPERATORS
 
 #define RANGES_WORKAROUND_CWG_1554
 #ifdef __clang__
@@ -349,6 +352,7 @@ namespace ranges
 #define RANGES_DIAGNOSTIC_IGNORE_DIVIDE_BY_ZERO
 #define RANGES_DIAGNOSTIC_IGNORE_UNSIGNED_MATH
 #define RANGES_DIAGNOSTIC_IGNORE_TRUNCATION
+#define RANGES_DIAGNOSTIC_IGNORE_MULTIPLE_ASSIGNMENT_OPERATORS
 #endif
 
 // Configuration via feature-test macros, with fallback to __cplusplus
diff --git a/include/range/v3/iterator/basic_iterator.hpp b/include/range/v3/iterator/basic_iterator.hpp
index c664cc098c..bf27ab6a7f 100644
--- a/include/range/v3/iterator/basic_iterator.hpp
+++ b/include/range/v3/iterator/basic_iterator.hpp
@@ -32,6 +32,9 @@
 #include <range/v3/utility/semiregular_box.hpp>
 #include <range/v3/utility/static_const.hpp>
 
+RANGES_DIAGNOSTIC_PUSH
+RANGES_DIAGNOSTIC_IGNORE_MULTIPLE_ASSIGNMENT_OPERATORS
+
 namespace ranges
 {
     /// \addtogroup group-iterator Iterator
@@ -935,4 +938,6 @@ namespace std
 } // namespace std
 /// \endcond
 
+RANGES_DIAGNOSTIC_POP
+
 #endif
diff --git a/test/experimental/utility/generator.cpp b/test/experimental/utility/generator.cpp
index 42900022dc..084b5ce10b 100644
--- a/test/experimental/utility/generator.cpp
+++ b/test/experimental/utility/generator.cpp
@@ -58,10 +58,10 @@ struct coro_fn
 
     CPP_template(typename V)(
         requires ranges::input_range<V> && ranges::view_<V> &&
-            is_copy_constructible_or_ref<ranges::range_reference_t<V>>())
+            (is_copy_constructible_or_ref<ranges::range_reference_t<V>>()))
     static generator_for<V> impl(V v)
     {
-        if /* constexpr */ (ranges::sized_range<V>)
+        if(RANGES_CONSTEXPR_IF(ranges::sized_range<V>))
             co_await static_cast<ranges::experimental::generator_size>((std::size_t)ranges::distance(v));
         auto first = ranges::begin(v);
         auto const last = ranges::end(v);
@@ -126,9 +126,9 @@ ranges::experimental::generator<T> iota_generator(T t)
 }
 
 CPP_template(class T, class S)(
-    requires ranges::weakly_incrementable<T> &&
+    requires (ranges::weakly_incrementable<T> &&
         ranges::detail::weakly_equality_comparable_with_<T, S> &&
-        (!ranges::sized_sentinel_for<S, T>) && !(ranges::integral<T> && ranges::integral<S>))
+        !ranges::sized_sentinel_for<S, T> && !(ranges::integral<T> && ranges::integral<S>)))
 ranges::experimental::generator<T> iota_generator(T t, S const s)
 {
     for (; t != s; ++t)
@@ -165,7 +165,7 @@ meta::invoke<
     ranges::indirect_result_t<F &, ranges::iterator_t<V>>>
 transform(V view, F f)
 {
-    if /* constexpr */ (ranges::sized_range<V>)
+    if(RANGES_CONSTEXPR_IF(ranges::sized_range<V>))
         co_await static_cast<ranges::experimental::generator_size>((std::size_t) ranges::distance(view));
     RANGES_FOR(auto &&i, view)
         co_yield ranges::invoke(f, i);