[libcxx-commits] [libcxx] [libcxx] improves diagnostics for containers with bad value types (PR #106296)

[Christopher Di Bella via libcxx-commits]

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@@ -468,6 +475,13 @@ const _DiffType __deque_iterator<_ValueType, _Pointer, _Reference, _MapPointer,
 
 template <class _Tp, class _Allocator /*= allocator<_Tp>*/>
 class _LIBCPP_TEMPLATE_VIS deque {
+  static_assert(!is_const<_Tp>::value, "'std::deque' cannot hold const types");
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cjdb wrote:

Working on this. Where is a good spot to put it? I was originally putting it in `__config`, but that's not great IMO. Possibly `__type_traits`, since it only consumes type traits?

https://github.com/llvm/llvm-project/pull/106296