message: Remove unnecessary inline
diff: @@ -477,7 +477,7 @@ public:
  #if defined(__cpp_fold_expressions) && defined(__cpp_if_constexpr)
  - template <class... Ts> inline
  + template <class... Ts>
  error operator()(Ts&&... xs) {
  error result;
  auto f = [&result, this](auto&& x) {
  