From 3c1ff451ffd14f842e96e0189673f4b73652e3cd Mon Sep 17 00:00:00 2001
From: "S. B. Tam" <cpplearner@outlook.com>
Date: Sat, 7 Oct 2023 18:54:18 +0800
Subject: [PATCH] `<format>`: Guard one use of `_MSVC_EXECUTION_CHARACTER_SET`

---
 stl/inc/format | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/stl/inc/format b/stl/inc/format
index 190c29557a6..e09d61e5f32 100644
--- a/stl/inc/format
+++ b/stl/inc/format
@@ -1139,12 +1139,14 @@ public:
 
         if constexpr (_Is_ordinary_literal_encoding_utf8()) {
             return _Decode_utf(_First, _Last, _Val);
+#ifdef _MSVC_EXECUTION_CHARACTER_SET // TRANSITION, VSO-1468747 (EDG)
         } else if constexpr (_Is_execution_charset_self_synchronizing()) {
             wchar_t _Wide;
             const auto _Res =
                 __std_fs_convert_narrow_to_wide(__std_code_page{_MSVC_EXECUTION_CHARACTER_SET}, _First, 1, &_Wide, 1);
             _Val = _Wide;
             return {_First + 1, _Res._Len != 0};
+#endif // defined(_MSVC_EXECUTION_CHARACTER_SET)
         } else {
             if (*_First == '\0') {
                 _Val = U'\0';