diff --git a/include/fmt/core.h b/include/fmt/core.h
index 77ff089b..0986789f 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -616,7 +616,8 @@ FMT_MAKE_VALUE(pointer_type, std::nullptr_t, const void*)
 // formatting of "[const] volatile char *" which is printed as bool by
 // iostreams.
 template <typename C, typename T>
-typed_value<C, pointer_type> make_value(const T *) {
+typename std::enable_if<!std::is_same<T, typename C::char_type>::value>::type
+    make_value(const T *) {
   static_assert(!sizeof(T), "formatting of non-void pointers is disallowed");
 }
 
@@ -1240,12 +1241,12 @@ inline std::string format(string_view format_str, const Args & ... args) {
   // This should be just
   // return vformat(format_str, make_format_args(args...));
   // but gcc has trouble optimizing the latter, so break it down.
-  format_arg_store<format_context, Args...> as(args...);
+  format_arg_store<format_context, Args...> as{args...};
   return vformat(format_str, as);
 }
 template <typename... Args>
 inline std::wstring format(wstring_view format_str, const Args & ... args) {
-  format_arg_store<wformat_context, Args...> as(args...);
+  format_arg_store<wformat_context, Args...> as{args...};
   return vformat(format_str, as);
 }
 
@@ -1286,7 +1287,7 @@ FMT_API void vprint(wstring_view format_str, wformat_args args);
  */
 template <typename... Args>
 inline void print(string_view format_str, const Args & ... args) {
-  format_arg_store<format_context, Args...> as(args...);
+  format_arg_store<format_context, Args...> as{args...};
   vprint(format_str, as);
 }
 
diff --git a/include/fmt/ostream.h b/include/fmt/ostream.h
index 14619364..5daa272b 100644
--- a/include/fmt/ostream.h
+++ b/include/fmt/ostream.h
@@ -140,13 +140,13 @@ inline void vprint(std::basic_ostream<Char> &os,
 template <typename... Args>
 inline void print(std::ostream &os, string_view format_str,
                   const Args & ... args) {
-  vprint(os, format_str, make_format_args<format_context>(args...));
+  vprint<char>(os, format_str, make_format_args<format_context>(args...));
 }
 
 template <typename... Args>
 inline void print(std::wostream &os, wstring_view format_str,
                   const Args & ... args) {
-  vprint(os, format_str, make_format_args<wformat_context>(args...));
+  vprint<wchar_t>(os, format_str, make_format_args<wformat_context>(args...));
 }
 FMT_END_NAMESPACE
 
diff --git a/include/fmt/printf.h b/include/fmt/printf.h
index 5a396964..e9a81669 100644
--- a/include/fmt/printf.h
+++ b/include/fmt/printf.h
@@ -215,7 +215,9 @@ class basic_printf_context;
  */
 template <typename Range>
 class printf_arg_formatter:
-  public internal::function<void>, public internal::arg_formatter_base<Range> {
+  public internal::function<
+    typename internal::arg_formatter_base<Range>::iterator>,
+  public internal::arg_formatter_base<Range> {
  private:
   typedef typename Range::value_type char_type;
   typedef decltype(internal::declval<Range>().begin()) iterator;
@@ -627,7 +629,7 @@ template <typename... Args>
 inline int fprintf(std::FILE *f, string_view format_str, const Args & ... args) {
   auto vargs = make_format_args<
     typename printf_context<internal::buffer>::type>(args...);
-  return vfprintf(f, format_str, vargs);
+  return vfprintf<char>(f, format_str, vargs);
 }
 
 template <typename... Args>
diff --git a/include/fmt/ranges.h b/include/fmt/ranges.h
index 3e8480a1..c04488de 100644
--- a/include/fmt/ranges.h
+++ b/include/fmt/ranges.h
@@ -34,18 +34,20 @@ template <typename Char, typename Enable = void>
 struct formatting_range : formatting_base<Char> {
   static FMT_CONSTEXPR_DECL const std::size_t range_length_limit =
       FMT_RANGE_OUTPUT_LENGTH_LIMIT; // output only up to N items from the range.
-  Char prefix = '{';
-  Char delimiter = ',';
-  Char postfix = '}';
+  Char prefix;
+  Char delimiter;
+  Char postfix;
+  formatting_range() : prefix('{'), delimiter(','), postfix('}') {}
   static FMT_CONSTEXPR_DECL const bool add_delimiter_spaces = true;
   static FMT_CONSTEXPR_DECL const bool add_prepostfix_space = false;
 };
 
 template <typename Char, typename Enable = void>
 struct formatting_tuple : formatting_base<Char> {
-  Char prefix = '(';
-  Char delimiter = ',';
-  Char postfix = ')';
+  Char prefix;
+  Char delimiter;
+  Char postfix;
+  formatting_tuple() : prefix('('), delimiter(','), postfix(')') {}
   static FMT_CONSTEXPR_DECL const bool add_delimiter_spaces = true;
   static FMT_CONSTEXPR_DECL const bool add_prepostfix_space = false;
 };
@@ -54,9 +56,8 @@ namespace internal {
 
 template <typename RangeT, typename OutputIterator>
 void copy(const RangeT &range, OutputIterator out) {
-  for (const auto &it : range) {
-    *out++ = it;
-  }
+  for (auto it = range.begin(), end = range.end(); it != end; ++it)
+    *out++ = *it;
 }
 
 template <typename OutputIterator>
@@ -83,7 +84,7 @@ class is_like_std_string {
 
  public:
   static FMT_CONSTEXPR_DECL const bool value =
-    !std::is_void<decltype(check<T>(nullptr))>::value;
+    !std::is_void<decltype(check<T>(FMT_NULL))>::value;
 };
 
 template <typename... Ts>
@@ -95,8 +96,8 @@ struct is_range_ : std::false_type {};
 template <typename T>
 struct is_range_<T,typename std::conditional<
                    false,
-                   conditional_helper<decltype(std::declval<T>().begin()),
-                                      decltype(std::declval<T>().end())>,
+                   conditional_helper<decltype(internal::declval<T>().begin()),
+                                      decltype(internal::declval<T>().end())>,
                    void>::type> : std::true_type {};
 
 template <typename T>
@@ -111,13 +112,13 @@ class is_tuple_like_ {
   template <typename U>
   static auto check(U *p) ->
     decltype(std::tuple_size<U>::value,
-             std::declval<typename std::tuple_element<0, U>::type>(), int());
+      internal::declval<typename std::tuple_element<0, U>::type>(), int());
   template <typename>
   static void check(...);
 
  public:
   static FMT_CONSTEXPR_DECL const bool value =
-    !std::is_void<decltype(check<T>(nullptr))>::value;
+    !std::is_void<decltype(check<T>(FMT_NULL))>::value;
 };
 
 template <typename T>
@@ -125,7 +126,16 @@ struct is_tuple_like {
   static FMT_CONSTEXPR_DECL const bool value =
     is_tuple_like_<T>::value && !is_range_<T>::value;
 };
+}  // namespace internal
 
+#if FMT_HAS_FEATURE(__cpp_lib_integer_sequence)
+# define FMT_USE_INTEGER_SEQUENCE 1
+#else
+# define FMT_USE_INTEGER_SEQUENCE 0
+#endif
+
+#if FMT_USE_INTEGER_SEQUENCE
+namespace internal {
 template <size_t... Is, class Tuple, class F>
 void for_each(std::index_sequence<Is...>, Tuple &&tup, F &&f) noexcept {
   using std::get;
@@ -183,6 +193,7 @@ struct formatter<TupleT, Char,
     return ctx.out();
   }
 };
+#endif  // FMT_USE_INTEGER_SEQUENCE
 
 template <typename RangeT, typename Char>
 struct formatter< RangeT, Char,
@@ -196,11 +207,12 @@ struct formatter< RangeT, Char,
   }
 
   template <typename FormatContext>
-  auto format(const RangeT &values, FormatContext &ctx) -> decltype(ctx.out()) {
+  typename FormatContext::iterator format(
+      const RangeT &values, FormatContext &ctx) {
     auto out = ctx.out();
     internal::copy(formatting.prefix, out);
     std::size_t i = 0;
-    for (const auto &it : values) {
+    for (auto it = values.begin(), end = values.end(); it != end; ++it) {
       if (i > 0) {
         if (formatting.add_prepostfix_space) {
           *out++ = ' ';
@@ -208,9 +220,9 @@ struct formatter< RangeT, Char,
         internal::copy(formatting.delimiter, out);
       }
       if (formatting.add_delimiter_spaces && i > 0) {
-        format_to(out, " {}", it);
+        format_to(out, " {}", *it);
       } else {
-        format_to(out, "{}", it);
+        format_to(out, "{}", *it);
       }
       if (++i > formatting.range_length_limit) {
         format_to(out, " ... <other elements>");
diff --git a/test/format-test.cc b/test/format-test.cc
index daa0b676..0044390e 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1394,7 +1394,8 @@ TEST(FormatTest, FixedEnum) {
 typedef fmt::back_insert_range<fmt::internal::buffer> buffer_range;
 
 class mock_arg_formatter:
-    public fmt::internal::function<void>,
+    public fmt::internal::function<
+      fmt::internal::arg_formatter_base<buffer_range>::iterator>,
     public fmt::internal::arg_formatter_base<buffer_range> {
  private:
   MOCK_METHOD1(call, void (int value));
diff --git a/test/ranges-test.cc b/test/ranges-test.cc
index 76c37a11..c27833f2 100644
--- a/test/ranges-test.cc
+++ b/test/ranges-test.cc
@@ -30,6 +30,7 @@ TEST(RangesTest, FormatVector2) {
   EXPECT_EQ("{{1, 2}, {3, 5}, {7, 11}}", ivf);
 }
 
+#if FMT_USE_INTEGER_SEQUENCE
 TEST(RangesTest, FormatMap) {
   std::map<std::string, int32_t> simap{{"one", 1}, {"two", 2}};
   EXPECT_EQ("{(one, 1), (two, 2)}", fmt::format("{}", simap));
@@ -46,7 +47,7 @@ TEST(RangesTest, FormatTuple) {
   EXPECT_EQ("(42, 3.14159, this is tuple)", fmt::format("{}", tu1));
 }
 
-/// check if  'if constexpr' is supported.
+/// Check if  'if constexpr' is supported.
 #if (__cplusplus > 201402L) || \
     (defined(_MSVC_LANG) && _MSVC_LANG > 201402L && _MSC_VER >= 1910)
 
@@ -86,3 +87,4 @@ TEST(RangesTest, FormatStruct) {
 
 #endif  // (__cplusplus > 201402L) || (defined(_MSVC_LANG) && _MSVC_LANG >
         // 201402L && _MSC_VER >= 1910)
+#endif  // FMT_USE_INTEGER_SEQUENCE
diff --git a/test/util-test.cc b/test/util-test.cc
index 5bba7736..07509118 100644
--- a/test/util-test.cc
+++ b/test/util-test.cc
@@ -397,13 +397,14 @@ TEST(FixedBufferTest, BufferOverflow) {
   EXPECT_THROW_MSG(buffer.resize(11), std::runtime_error, "buffer overflow");
 }
 
+struct uint32_pair {
+  uint32_t u[2];
+};
+
 TEST(UtilTest, BitCast) {
-  struct S {
-    uint32_t u[2];
-  };
-  auto s = fmt::internal::bit_cast<S>(uint64_t(42));
+  auto s = fmt::internal::bit_cast<uint32_pair>(uint64_t{42});
   EXPECT_EQ(fmt::internal::bit_cast<uint64_t>(s), 42u);
-  s = fmt::internal::bit_cast<S>(uint64_t(~0ull));
+  s = fmt::internal::bit_cast<uint32_pair>(uint64_t(~0ull));
   EXPECT_EQ(fmt::internal::bit_cast<uint64_t>(s), ~0ull);
 }