[llvm] [clang-tools-extra] [compiler-rt] [libcxx] [clang] [flang] [libc] [mlir] [lldb] [lld] [libc++][format] P2637R3: Member `visit` (`std::basic_format_arg`) (PR #76449)

[Mark de Wever via cfe-commits]

================
@@ -7,6 +7,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
+// XFAIL: clang-16 || clang-17
----------------
mordante wrote:

We know it fails so there is no real need to test that.
Quite often we do XFAIL when we want to update tests when they suddenly start to work.
```suggestion
// The tested functionality needs deducing this.
// UNSUPPORTED: clang-16 || clang-17
```

https://github.com/llvm/llvm-project/pull/76449