--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/fmt/test/xchar-test.cc	Thu Jun 20 05:56:06 2024 -0400
@@ -0,0 +1,629 @@
+// Formatting library for C++ - formatting library tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/xchar.h"
+
+#include <algorithm>
+#include <complex>
+#include <cwchar>
+#include <vector>
+
+#include "fmt/chrono.h"
+#include "fmt/color.h"
+#include "fmt/ostream.h"
+#include "fmt/ranges.h"
+#include "fmt/std.h"
+#include "gtest-extra.h"  // Contains
+#include "util.h"         // get_locale
+
+using fmt::detail::max_value;
+using testing::Contains;
+
+#if defined(__MINGW32__) && !defined(_UCRT)
+// Only C89 conversion specifiers when using MSVCRT instead of UCRT
+#  define FMT_HAS_C99_STRFTIME 0
+#else
+#  define FMT_HAS_C99_STRFTIME 1
+#endif
+
+struct non_string {};
+
+template <typename T> class is_string_test : public testing::Test {};
+
+using string_char_types = testing::Types<char, wchar_t, char16_t, char32_t>;
+TYPED_TEST_SUITE(is_string_test, string_char_types);
+
+template <typename Char>
+struct derived_from_string_view : fmt::basic_string_view<Char> {};
+
+TYPED_TEST(is_string_test, is_string) {
+  EXPECT_TRUE(fmt::detail::is_string<TypeParam*>::value);
+  EXPECT_TRUE(fmt::detail::is_string<const TypeParam*>::value);
+  EXPECT_TRUE(fmt::detail::is_string<TypeParam[2]>::value);
+  EXPECT_TRUE(fmt::detail::is_string<const TypeParam[2]>::value);
+  EXPECT_TRUE(fmt::detail::is_string<std::basic_string<TypeParam>>::value);
+  EXPECT_TRUE(fmt::detail::is_string<fmt::basic_string_view<TypeParam>>::value);
+  EXPECT_TRUE(
+      fmt::detail::is_string<derived_from_string_view<TypeParam>>::value);
+  using fmt_string_view = fmt::detail::std_string_view<TypeParam>;
+  EXPECT_TRUE(std::is_empty<fmt_string_view>::value !=
+              fmt::detail::is_string<fmt_string_view>::value);
+  EXPECT_FALSE(fmt::detail::is_string<non_string>::value);
+}
+
+// std::is_constructible is broken in MSVC until version 2015.
+#if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1900
+struct explicitly_convertible_to_wstring_view {
+  explicit operator fmt::wstring_view() const { return L"foo"; }
+};
+
+TEST(xchar_test, format_explicitly_convertible_to_wstring_view) {
+  // Types explicitly convertible to wstring_view are not formattable by
+  // default because it may introduce ODR violations.
+  static_assert(
+      !fmt::is_formattable<explicitly_convertible_to_wstring_view>::value, "");
+}
+#endif
+
+TEST(xchar_test, format) {
+  EXPECT_EQ(L"42", fmt::format(L"{}", 42));
+  EXPECT_EQ(L"4.2", fmt::format(L"{}", 4.2));
+  EXPECT_EQ(L"abc", fmt::format(L"{}", L"abc"));
+  EXPECT_EQ(L"z", fmt::format(L"{}", L'z'));
+  EXPECT_THROW(fmt::format(fmt::runtime(L"{:*\x343E}"), 42), fmt::format_error);
+  EXPECT_EQ(L"true", fmt::format(L"{}", true));
+  EXPECT_EQ(L"a", fmt::format(L"{0}", 'a'));
+  EXPECT_EQ(L"a", fmt::format(L"{0}", L'a'));
+  EXPECT_EQ(L"Cyrillic letter \x42e",
+            fmt::format(L"Cyrillic letter {}", L'\x42e'));
+  EXPECT_EQ(L"abc1", fmt::format(L"{}c{}", L"ab", 1));
+}
+
+TEST(xchar_test, is_formattable) {
+  static_assert(!fmt::is_formattable<const wchar_t*>::value, "");
+}
+
+TEST(xchar_test, compile_time_string) {
+  EXPECT_EQ(fmt::format(fmt::wformat_string<int>(L"{}"), 42), L"42");
+#if defined(FMT_USE_STRING_VIEW) && FMT_CPLUSPLUS >= 201703L
+  EXPECT_EQ(fmt::format(FMT_STRING(std::wstring_view(L"{}")), 42), L"42");
+#endif
+}
+
+#if FMT_CPLUSPLUS > 201103L
+struct custom_char {
+  int value;
+  custom_char() = default;
+
+  template <typename T>
+  constexpr custom_char(T val) : value(static_cast<int>(val)) {}
+
+  constexpr operator char() const {
+    return value <= 0xff ? static_cast<char>(value) : '\0';
+  }
+  constexpr bool operator<(custom_char c) const { return value < c.value; }
+};
+
+namespace std {
+
+template <> struct char_traits<custom_char> {
+  using char_type = custom_char;
+  using int_type = int;
+  using off_type = streamoff;
+  using pos_type = streampos;
+  using state_type = mbstate_t;
+
+  static constexpr void assign(char_type& r, const char_type& a) { r = a; }
+  static constexpr bool eq(char_type a, char_type b) { return a == b; }
+  static constexpr bool lt(char_type a, char_type b) { return a < b; }
+  static FMT_CONSTEXPR int compare(const char_type* s1, const char_type* s2,
+                                   size_t count) {
+    for (; count; count--, s1++, s2++) {
+      if (lt(*s1, *s2)) return -1;
+      if (lt(*s2, *s1)) return 1;
+    }
+    return 0;
+  }
+  static FMT_CONSTEXPR size_t length(const char_type* s) {
+    size_t count = 0;
+    while (!eq(*s++, custom_char(0))) count++;
+    return count;
+  }
+  static const char_type* find(const char_type*, size_t, const char_type&);
+  static FMT_CONSTEXPR char_type* move(char_type* dest, const char_type* src,
+                                       size_t count) {
+    if (count == 0) return dest;
+    char_type* ret = dest;
+    if (src < dest) {
+      dest += count;
+      src += count;
+      for (; count; count--) assign(*--dest, *--src);
+    } else if (src > dest)
+      copy(dest, src, count);
+    return ret;
+  }
+  static FMT_CONSTEXPR char_type* copy(char_type* dest, const char_type* src,
+                                       size_t count) {
+    char_type* ret = dest;
+    for (; count; count--) assign(*dest++, *src++);
+    return ret;
+  }
+  static FMT_CONSTEXPR char_type* assign(char_type* dest, std::size_t count,
+                                         char_type a) {
+    char_type* ret = dest;
+    for (; count; count--) assign(*dest++, a);
+    return ret;
+  }
+  static int_type not_eof(int_type);
+  static char_type to_char_type(int_type);
+  static int_type to_int_type(char_type);
+  static bool eq_int_type(int_type, int_type);
+  static int_type eof();
+};
+
+}  // namespace std
+
+auto to_ascii(custom_char c) -> char { return c; }
+
+FMT_BEGIN_NAMESPACE
+template <> struct is_char<custom_char> : std::true_type {};
+FMT_END_NAMESPACE
+
+TEST(xchar_test, format_custom_char) {
+  const custom_char format[] = {'{', '}', 0};
+  auto result = fmt::format(format, custom_char('x'));
+  EXPECT_EQ(result.size(), 1);
+  EXPECT_EQ(result[0], custom_char('x'));
+}
+#endif
+
+// Convert a char8_t string to std::string. Otherwise GTest will insist on
+// inserting `char8_t` NTBS into a `char` stream which is disabled by P1423.
+template <typename S> std::string from_u8str(const S& str) {
+  return std::string(str.begin(), str.end());
+}
+
+TEST(xchar_test, format_to) {
+  auto buf = std::vector<wchar_t>();
+  fmt::format_to(std::back_inserter(buf), L"{}{}", 42, L'\0');
+  EXPECT_STREQ(buf.data(), L"42");
+}
+
+TEST(xchar_test, vformat_to) {
+  auto args = fmt::make_wformat_args(42);
+  auto w = std::wstring();
+  fmt::vformat_to(std::back_inserter(w), L"{}", args);
+  EXPECT_EQ(L"42", w);
+}
+
+namespace test {
+struct struct_as_wstring_view {};
+auto format_as(struct_as_wstring_view) -> fmt::wstring_view { return L"foo"; }
+}  // namespace test
+
+TEST(xchar_test, format_as) {
+  EXPECT_EQ(fmt::format(L"{}", test::struct_as_wstring_view()), L"foo");
+}
+
+TEST(format_test, wide_format_to_n) {
+  wchar_t buffer[4];
+  buffer[3] = L'x';
+  auto result = fmt::format_to_n(buffer, 3, L"{}", 12345);
+  EXPECT_EQ(5u, result.size);
+  EXPECT_EQ(buffer + 3, result.out);
+  EXPECT_EQ(L"123x", fmt::wstring_view(buffer, 4));
+  buffer[0] = L'x';
+  buffer[1] = L'x';
+  buffer[2] = L'x';
+  result = fmt::format_to_n(buffer, 3, L"{}", L'A');
+  EXPECT_EQ(1u, result.size);
+  EXPECT_EQ(buffer + 1, result.out);
+  EXPECT_EQ(L"Axxx", fmt::wstring_view(buffer, 4));
+  result = fmt::format_to_n(buffer, 3, L"{}{} ", L'B', L'C');
+  EXPECT_EQ(3u, result.size);
+  EXPECT_EQ(buffer + 3, result.out);
+  EXPECT_EQ(L"BC x", fmt::wstring_view(buffer, 4));
+}
+
+#if FMT_USE_USER_DEFINED_LITERALS
+TEST(xchar_test, named_arg_udl) {
+  using namespace fmt::literals;
+  auto udl_a =
+      fmt::format(L"{first}{second}{first}{third}", L"first"_a = L"abra",
+                  L"second"_a = L"cad", L"third"_a = 99);
+  EXPECT_EQ(
+      fmt::format(L"{first}{second}{first}{third}", fmt::arg(L"first", L"abra"),
+                  fmt::arg(L"second", L"cad"), fmt::arg(L"third", 99)),
+      udl_a);
+}
+#endif  // FMT_USE_USER_DEFINED_LITERALS
+
+TEST(xchar_test, print) {
+  // Check that the wide print overload compiles.
+  if (fmt::detail::const_check(false)) {
+    fmt::print(L"test");
+    fmt::println(L"test");
+  }
+}
+
+TEST(xchar_test, join) {
+  int v[3] = {1, 2, 3};
+  EXPECT_EQ(fmt::format(L"({})", fmt::join(v, v + 3, L", ")), L"(1, 2, 3)");
+  auto t = std::tuple<wchar_t, int, float>('a', 1, 2.0f);
+  EXPECT_EQ(fmt::format(L"({})", fmt::join(t, L", ")), L"(a, 1, 2)");
+}
+
+enum streamable_enum {};
+
+std::wostream& operator<<(std::wostream& os, streamable_enum) {
+  return os << L"streamable_enum";
+}
+
+namespace fmt {
+template <>
+struct formatter<streamable_enum, wchar_t> : basic_ostream_formatter<wchar_t> {
+};
+}  // namespace fmt
+
+enum unstreamable_enum {};
+auto format_as(unstreamable_enum e) -> int { return e; }
+
+TEST(xchar_test, enum) {
+  EXPECT_EQ(L"streamable_enum", fmt::format(L"{}", streamable_enum()));
+  EXPECT_EQ(L"0", fmt::format(L"{}", unstreamable_enum()));
+}
+
+struct streamable_and_unformattable {};
+
+auto operator<<(std::wostream& os, streamable_and_unformattable)
+    -> std::wostream& {
+  return os << L"foo";
+}
+
+TEST(xchar_test, streamed) {
+  EXPECT_FALSE(fmt::is_formattable<streamable_and_unformattable>());
+  EXPECT_EQ(fmt::format(L"{}", fmt::streamed(streamable_and_unformattable())),
+            L"foo");
+}
+
+TEST(xchar_test, sign_not_truncated) {
+  wchar_t format_str[] = {
+      L'{', L':',
+      '+' | static_cast<wchar_t>(1 << fmt::detail::num_bits<char>()), L'}', 0};
+  EXPECT_THROW(fmt::format(fmt::runtime(format_str), 42), fmt::format_error);
+}
+
+TEST(xchar_test, chrono) {
+  auto tm = std::tm();
+  tm.tm_year = 116;
+  tm.tm_mon = 3;
+  tm.tm_mday = 25;
+  tm.tm_hour = 11;
+  tm.tm_min = 22;
+  tm.tm_sec = 33;
+  EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
+            "The date is 2016-04-25 11:22:33.");
+  EXPECT_EQ(L"42s", fmt::format(L"{}", std::chrono::seconds(42)));
+  EXPECT_EQ(fmt::format(L"{:%F}", tm), L"2016-04-25");
+  EXPECT_EQ(fmt::format(L"{:%T}", tm), L"11:22:33");
+}
+
+std::wstring system_wcsftime(const std::wstring& format, const std::tm* timeptr,
+                             std::locale* locptr = nullptr) {
+  auto loc = locptr ? *locptr : std::locale::classic();
+  auto& facet = std::use_facet<std::time_put<wchar_t>>(loc);
+  std::wostringstream os;
+  os.imbue(loc);
+  facet.put(os, os, L' ', timeptr, format.c_str(),
+            format.c_str() + format.size());
+#ifdef _WIN32
+  // Workaround a bug in older versions of Universal CRT.
+  auto str = os.str();
+  if (str == L"-0000") str = L"+0000";
+  return str;
+#else
+  return os.str();
+#endif
+}
+
+TEST(chrono_test_wchar, time_point) {
+  auto t1 = std::chrono::time_point_cast<std::chrono::seconds>(
+      std::chrono::system_clock::now());
+
+  std::vector<std::wstring> spec_list = {
+      L"%%",  L"%n",  L"%t",  L"%Y",  L"%EY", L"%y",  L"%Oy", L"%Ey", L"%C",
+      L"%EC", L"%G",  L"%g",  L"%b",  L"%h",  L"%B",  L"%m",  L"%Om", L"%U",
+      L"%OU", L"%W",  L"%OW", L"%V",  L"%OV", L"%j",  L"%d",  L"%Od", L"%e",
+      L"%Oe", L"%a",  L"%A",  L"%w",  L"%Ow", L"%u",  L"%Ou", L"%H",  L"%OH",
+      L"%I",  L"%OI", L"%M",  L"%OM", L"%S",  L"%OS", L"%x",  L"%Ex", L"%X",
+      L"%EX", L"%D",  L"%F",  L"%R",  L"%T",  L"%p"};
+#ifndef _WIN32
+  // Disabled on Windows, because these formats is not consistent among
+  // platforms.
+  spec_list.insert(spec_list.end(), {L"%c", L"%Ec", L"%r"});
+#elif !FMT_HAS_C99_STRFTIME
+  // Only C89 conversion specifiers when using MSVCRT instead of UCRT
+  spec_list = {L"%%", L"%Y", L"%y", L"%b", L"%B", L"%m", L"%U",
+               L"%W", L"%j", L"%d", L"%a", L"%A", L"%w", L"%H",
+               L"%I", L"%M", L"%S", L"%x", L"%X", L"%p"};
+#endif
+  spec_list.push_back(L"%Y-%m-%d %H:%M:%S");
+
+  for (const auto& spec : spec_list) {
+    auto t = std::chrono::system_clock::to_time_t(t1);
+    auto tm = *std::gmtime(&t);
+
+    auto sys_output = system_wcsftime(spec, &tm);
+
+    auto fmt_spec = fmt::format(L"{{:{}}}", spec);
+    EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), t1));
+    EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm));
+  }
+
+  // Timezone formatters tests makes sense for localtime.
+#if FMT_HAS_C99_STRFTIME
+  spec_list = {L"%z", L"%Z"};
+#else
+  spec_list = {L"%Z"};
+#endif
+  for (const auto& spec : spec_list) {
+    auto t = std::chrono::system_clock::to_time_t(t1);
+    auto tm = *std::localtime(&t);
+
+    auto sys_output = system_wcsftime(spec, &tm);
+
+    auto fmt_spec = fmt::format(L"{{:{}}}", spec);
+    EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm));
+
+    if (spec == L"%z") {
+      sys_output.insert(sys_output.end() - 2, 1, L':');
+      EXPECT_EQ(sys_output, fmt::format(L"{:%Ez}", tm));
+      EXPECT_EQ(sys_output, fmt::format(L"{:%Oz}", tm));
+    }
+  }
+
+  // Separate tests for UTC, since std::time_put can use local time and ignoring
+  // the timezone in std::tm (if it presents on platform).
+  if (fmt::detail::has_member_data_tm_zone<std::tm>::value) {
+    auto t = std::chrono::system_clock::to_time_t(t1);
+    auto tm = *std::gmtime(&t);
+
+    std::vector<std::wstring> tz_names = {L"GMT", L"UTC"};
+    EXPECT_THAT(tz_names, Contains(fmt::format(L"{:%Z}", t1)));
+    EXPECT_THAT(tz_names, Contains(fmt::format(L"{:%Z}", tm)));
+  }
+
+  if (fmt::detail::has_member_data_tm_gmtoff<std::tm>::value) {
+    auto t = std::chrono::system_clock::to_time_t(t1);
+    auto tm = *std::gmtime(&t);
+
+    EXPECT_EQ(L"+0000", fmt::format(L"{:%z}", t1));
+    EXPECT_EQ(L"+0000", fmt::format(L"{:%z}", tm));
+
+    EXPECT_EQ(L"+00:00", fmt::format(L"{:%Ez}", t1));
+    EXPECT_EQ(L"+00:00", fmt::format(L"{:%Ez}", tm));
+
+    EXPECT_EQ(L"+00:00", fmt::format(L"{:%Oz}", t1));
+    EXPECT_EQ(L"+00:00", fmt::format(L"{:%Oz}", tm));
+  }
+}
+
+TEST(xchar_test, color) {
+  EXPECT_EQ(fmt::format(fg(fmt::rgb(255, 20, 30)), L"rgb(255,20,30) wide"),
+            L"\x1b[38;2;255;020;030mrgb(255,20,30) wide\x1b[0m");
+}
+
+TEST(xchar_test, ostream) {
+#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 409
+  {
+    std::wostringstream wos;
+    fmt::print(wos, L"Don't {}!", L"panic");
+    EXPECT_EQ(wos.str(), L"Don't panic!");
+  }
+
+  {
+    std::wostringstream wos;
+    fmt::println(wos, L"Don't {}!", L"panic");
+    EXPECT_EQ(wos.str(), L"Don't panic!\n");
+  }
+#endif
+}
+
+TEST(xchar_test, format_map) {
+  auto m = std::map<std::wstring, int>{{L"one", 1}, {L"t\"wo", 2}};
+  EXPECT_EQ(fmt::format(L"{}", m), L"{\"one\": 1, \"t\\\"wo\": 2}");
+}
+
+TEST(xchar_test, escape_string) {
+  using vec = std::vector<std::wstring>;
+  EXPECT_EQ(fmt::format(L"{}", vec{L"\n\r\t\"\\"}), L"[\"\\n\\r\\t\\\"\\\\\"]");
+  EXPECT_EQ(fmt::format(L"{}", vec{L"понедельник"}), L"[\"понедельник\"]");
+}
+
+TEST(xchar_test, to_wstring) { EXPECT_EQ(L"42", fmt::to_wstring(42)); }
+
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+
+template <typename Char> struct numpunct : std::numpunct<Char> {
+ protected:
+  Char do_decimal_point() const override { return '?'; }
+  std::string do_grouping() const override { return "\03"; }
+  Char do_thousands_sep() const override { return '~'; }
+};
+
+template <typename Char> struct no_grouping : std::numpunct<Char> {
+ protected:
+  Char do_decimal_point() const override { return '.'; }
+  std::string do_grouping() const override { return ""; }
+  Char do_thousands_sep() const override { return ','; }
+};
+
+template <typename Char> struct special_grouping : std::numpunct<Char> {
+ protected:
+  Char do_decimal_point() const override { return '.'; }
+  std::string do_grouping() const override { return "\03\02"; }
+  Char do_thousands_sep() const override { return ','; }
+};
+
+template <typename Char> struct small_grouping : std::numpunct<Char> {
+ protected:
+  Char do_decimal_point() const override { return '.'; }
+  std::string do_grouping() const override { return "\01"; }
+  Char do_thousands_sep() const override { return ','; }
+};
+
+TEST(locale_test, localized_double) {
+  auto loc = std::locale(std::locale(), new numpunct<char>());
+  EXPECT_EQ(fmt::format(loc, "{:L}", 1.23), "1?23");
+  EXPECT_EQ(fmt::format(loc, "{:Lf}", 1.23), "1?230000");
+  EXPECT_EQ(fmt::format(loc, "{:L}", 1234.5), "1~234?5");
+  EXPECT_EQ(fmt::format(loc, "{:L}", 12000.0), "12~000");
+  EXPECT_EQ(fmt::format(loc, "{:8L}", 1230.0), "   1~230");
+  EXPECT_EQ(fmt::format(loc, "{:15.6Lf}", 0.1), "       0?100000");
+  EXPECT_EQ(fmt::format(loc, "{:15.6Lf}", 1.0), "       1?000000");
+  EXPECT_EQ(fmt::format(loc, "{:15.6Lf}", 1e3), "   1~000?000000");
+}
+
+TEST(locale_test, format) {
+  auto loc = std::locale(std::locale(), new numpunct<char>());
+  EXPECT_EQ("1234567", fmt::format(std::locale(), "{:L}", 1234567));
+  EXPECT_EQ("1~234~567", fmt::format(loc, "{:L}", 1234567));
+  EXPECT_EQ("-1~234~567", fmt::format(loc, "{:L}", -1234567));
+  EXPECT_EQ("-256", fmt::format(loc, "{:L}", -256));
+  auto n = 1234567;
+  EXPECT_EQ("1~234~567", fmt::vformat(loc, "{:L}", fmt::make_format_args(n)));
+  auto s = std::string();
+  fmt::format_to(std::back_inserter(s), loc, "{:L}", 1234567);
+  EXPECT_EQ("1~234~567", s);
+
+  auto no_grouping_loc = std::locale(std::locale(), new no_grouping<char>());
+  EXPECT_EQ("1234567", fmt::format(no_grouping_loc, "{:L}", 1234567));
+
+  auto special_grouping_loc =
+      std::locale(std::locale(), new special_grouping<char>());
+  EXPECT_EQ("1,23,45,678", fmt::format(special_grouping_loc, "{:L}", 12345678));
+  EXPECT_EQ("12,345", fmt::format(special_grouping_loc, "{:L}", 12345));
+
+  auto small_grouping_loc =
+      std::locale(std::locale(), new small_grouping<char>());
+  EXPECT_EQ("4,2,9,4,9,6,7,2,9,5",
+            fmt::format(small_grouping_loc, "{:L}", max_value<uint32_t>()));
+}
+
+TEST(locale_test, format_detault_align) {
+  auto loc = std::locale({}, new special_grouping<char>());
+  EXPECT_EQ("  12,345", fmt::format(loc, "{:8L}", 12345));
+}
+
+TEST(locale_test, format_plus) {
+  auto loc = std::locale({}, new special_grouping<char>());
+  EXPECT_EQ("+100", fmt::format(loc, "{:+L}", 100));
+}
+
+TEST(locale_test, wformat) {
+  auto loc = std::locale(std::locale(), new numpunct<wchar_t>());
+  EXPECT_EQ(L"1234567", fmt::format(std::locale(), L"{:L}", 1234567));
+  EXPECT_EQ(L"1~234~567", fmt::format(loc, L"{:L}", 1234567));
+  int n = 1234567;
+  EXPECT_EQ(L"1~234~567",
+            fmt::vformat(loc, L"{:L}", fmt::make_wformat_args(n)));
+  EXPECT_EQ(L"1234567", fmt::format(std::locale("C"), L"{:L}", 1234567));
+
+  auto no_grouping_loc = std::locale(std::locale(), new no_grouping<wchar_t>());
+  EXPECT_EQ(L"1234567", fmt::format(no_grouping_loc, L"{:L}", 1234567));
+
+  auto special_grouping_loc =
+      std::locale(std::locale(), new special_grouping<wchar_t>());
+  EXPECT_EQ(L"1,23,45,678",
+            fmt::format(special_grouping_loc, L"{:L}", 12345678));
+
+  auto small_grouping_loc =
+      std::locale(std::locale(), new small_grouping<wchar_t>());
+  EXPECT_EQ(L"4,2,9,4,9,6,7,2,9,5",
+            fmt::format(small_grouping_loc, L"{:L}", max_value<uint32_t>()));
+}
+
+TEST(locale_test, int_formatter) {
+  auto loc = std::locale(std::locale(), new special_grouping<char>());
+  auto f = fmt::formatter<int>();
+  auto parse_ctx = fmt::format_parse_context("L");
+  f.parse(parse_ctx);
+  auto buf = fmt::memory_buffer();
+  fmt::basic_format_context<fmt::appender, char> format_ctx(
+      fmt::appender(buf), {}, fmt::detail::locale_ref(loc));
+  f.format(12345, format_ctx);
+  EXPECT_EQ(fmt::to_string(buf), "12,345");
+}
+
+FMT_BEGIN_NAMESPACE
+template <class charT> struct formatter<std::complex<double>, charT> {
+ private:
+  detail::dynamic_format_specs<char> specs_;
+
+ public:
+  FMT_CONSTEXPR typename basic_format_parse_context<charT>::iterator parse(
+      basic_format_parse_context<charT>& ctx) {
+    auto end = parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx,
+                                  detail::type::float_type);
+    detail::parse_float_type_spec(specs_);
+    return end;
+  }
+
+  template <class FormatContext>
+  typename FormatContext::iterator format(const std::complex<double>& c,
+                                          FormatContext& ctx) {
+    detail::handle_dynamic_spec<detail::precision_checker>(
+        specs_.precision, specs_.precision_ref, ctx);
+    auto specs = std::string();
+    if (specs_.precision > 0) specs = fmt::format(".{}", specs_.precision);
+    if (specs_.type == presentation_type::fixed_lower) specs += 'f';
+    auto real = fmt::format(ctx.locale().template get<std::locale>(),
+                            fmt::runtime("{:" + specs + "}"), c.real());
+    auto imag = fmt::format(ctx.locale().template get<std::locale>(),
+                            fmt::runtime("{:" + specs + "}"), c.imag());
+    auto fill_align_width = std::string();
+    if (specs_.width > 0) fill_align_width = fmt::format(">{}", specs_.width);
+    return fmt::format_to(ctx.out(), runtime("{:" + fill_align_width + "}"),
+                          c.real() != 0 ? fmt::format("({}+{}i)", real, imag)
+                                        : fmt::format("{}i", imag));
+  }
+};
+FMT_END_NAMESPACE
+
+TEST(locale_test, complex) {
+  std::string s = fmt::format("{}", std::complex<double>(1, 2));
+  EXPECT_EQ(s, "(1+2i)");
+  EXPECT_EQ(fmt::format("{:.2f}", std::complex<double>(1, 2)), "(1.00+2.00i)");
+  EXPECT_EQ(fmt::format("{:8}", std::complex<double>(1, 2)), "  (1+2i)");
+}
+
+TEST(locale_test, chrono_weekday) {
+  auto loc = get_locale("es_ES.UTF-8", "Spanish_Spain.1252");
+  auto loc_old = std::locale::global(loc);
+  auto sat = fmt::weekday(6);
+  EXPECT_EQ(fmt::format(L"{}", sat), L"Sat");
+  if (loc != std::locale::classic()) {
+    // L'\xE1' is 'á'.
+    auto saturdays = std::vector<std::wstring>{L"s\xE1""b", L"s\xE1."};
+    EXPECT_THAT(saturdays, Contains(fmt::format(loc, L"{:L}", sat)));
+  }
+  std::locale::global(loc_old);
+}
+
+TEST(locale_test, sign) {
+  EXPECT_EQ(fmt::format(std::locale(), L"{:L}", -50), L"-50");
+}
+
+TEST(std_test_xchar, optional) {
+#  ifdef __cpp_lib_optional
+  EXPECT_EQ(fmt::format(L"{}", std::optional{L'C'}), L"optional(\'C\')");
+  EXPECT_EQ(fmt::format(L"{}", std::optional{std::wstring{L"wide string"}}),
+            L"optional(\"wide string\")");
+#  endif
+}
+
+#endif  // FMT_STATIC_THOUSANDS_SEPARATOR