Update header

Author: JCGoran

libcxx/include/algorithm

@@ -938,6 +938,15 @@ namespace ranges {
   template<input_range R, class T, indirectly-binary-left-foldable<T, iterator_t<R>> F>
     constexpr auto fold_left(R&& r, T init, F f);                                                   // since C++23
 
+  template<input_iterator I, sentinel_for<I> S,
+           indirectly-binary-left-foldable<T, I> F>
+    requires constructible_from<iter_value_t<I>, iter_reference_t<I>>
+    constexpr see below fold_left_first(I first, S last, F f);                                      // since C++23
+
+  template<input_range R, indirectly-binary-left-foldable<T, iterator_t<R>> F>
+    requires constructible_from<range_value_t<R>, range_reference_t<R>>
+    constexpr see below fold_left_first(R&& r, F f);                                                // since C++23
+
   template<class I, class T>
     using fold_left_with_iter_result = in_value_result<I, T>;                                       // since C++23
 
@@ -949,7 +958,7 @@ namespace ranges {
     constexpr see below fold_left_with_iter(R&& r, T init, F f);                                    // since C++23
 
   template<class I, class T>
-    using fold_left_first_with_iter_result = in_value_result<I, optional<T>>;                       // since C++23
+    using fold_left_first_with_iter_result = in_value_result<I, T>;                                 // since C++23
 
   template<input_iterator I, sentinel_for<I> S,
            indirectly-binary-left-foldable<T, I> F>