[libc] [clang-tools-extra] [llvm] [libcxx] [mlir] [clang] [libc++][span] P2821R5: span.at() (PR #74994)

[Mark de Wever via cfe-commits]

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@@ -343,6 +345,15 @@ public:
         return __data_[__idx];
     }
 
+#  if _LIBCPP_STD_VER >= 26
+    _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __index) const {
+      if (__index >= size()) {
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mordante wrote:

@philnik777 requested to remove these braces and I agree. This is the LLVM coding style.

https://github.com/llvm/llvm-project/pull/74994