Apply coding conventions

Author: vitaut

test/compile-test.cc

@@ -317,8 +317,7 @@ TEST(compile_test, compile_format_string_literal) {
 #endif
 
 #if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
-template <typename S>
-bool check_is_compiled_string(const S&) {
+template <typename S> auto check_is_compiled_string(const S&) -> bool {
   return fmt::is_compiled_string<S>::value;
 }
 
@@ -339,7 +338,7 @@ TEST(compile_test, is_compiled_string) {
      (FMT_MSC_VERSION >= 1928 && FMT_MSC_VERSION < 1930)) && \
     defined(__cpp_lib_is_constant_evaluated)
 template <size_t max_string_length, typename Char = char> struct test_string {
-  template <typename T> constexpr bool operator==(const T& rhs) const noexcept {
+  template <typename T> constexpr auto operator==(const T& rhs) const -> bool {
     return fmt::basic_string_view<Char>(rhs).compare(buffer) == 0;
   }
   Char buffer[max_string_length]{};