Implement LWG-3707: `chunk_view::outer-iterator::value_type::size` should return unsigned type (#2883)

stl/inc/ranges

@@ -5380,7 +5380,8 @@ namespace ranges {
                 _NODISCARD constexpr auto size() const
                     noexcept(noexcept(_RANGES end(_Parent->_Range) - *_Parent->_Current)) /* strengthened */
                     requires sized_sentinel_for<sentinel_t<_Vw>, iterator_t<_Vw>> {
-                    return (_STD min)(_Parent->_Remainder, _RANGES end(_Parent->_Range) - *_Parent->_Current);
+                    return _To_unsigned_like(
+                        (_STD min)(_Parent->_Remainder, _RANGES end(_Parent->_Range) - *_Parent->_Current));
                 }
             };
 

tests/std/tests/P2442R1_views_chunk/test.cpp

@@ -465,7 +465,8 @@ constexpr bool test_input(Rng&& rng, Expected&& expected) {
 
     auto val_ty = *outer_iter;
     if constexpr (sized_sentinel_for<sentinel_t<Rng>, iterator_t<Rng>>) {
-        assert(val_ty.size() == 2);
+        const same_as<_Make_unsigned_like_t<ranges::range_difference_t<V>>> auto s = val_ty.size(); // test LWG-3707
+        assert(s == 2);
     }
 
     auto inner_iter                            = val_ty.begin();