[clang] [libcxx] [llvm] [Clang] Add warnings when mixing different charN_t types (PR #138708)

[via cfe-commits]

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@@ -123,7 +123,7 @@ _LIBCPP_HIDE_FROM_ABI constexpr void __encode(_OutIt& 
__out_it, char32_t __value
   _LIBCPP_ASSERT_UNCATEGORIZED(__is_scalar_value(__value), "an invalid unicode 
scalar value results in invalid UTF-16");
 
   if (__value < 0x10000) {
-    *__out_it++ = __value;
+    *__out_it++ = static_cast<iter_value_t<_OutIt>>(__value);
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cor3ntin wrote:

Yup!

https://github.com/llvm/llvm-project/pull/138708
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