diff --git a/source/mijin/util/iterators.hpp b/source/mijin/util/iterators.hpp
index 5fca076..3a33743 100644
--- a/source/mijin/util/iterators.hpp
+++ b/source/mijin/util/iterators.hpp
@@ -43,7 +43,7 @@ template<typename CharT, typename Traits>
 struct is_range_adapter_type<std::basic_string_view<CharT, Traits>> : std::true_type {};
 
 template<typename T>
-concept RangeAdapterType = is_range_adapter_type<T>::value;
+concept RangeAdapterType = is_range_adapter_type<std::decay_t<T>>::value;
 
 static_assert(!is_range_adapter_type<std::tuple<int, int>>::value);
 static_assert(is_range_adapter_type<RangeAdapter>::value);
@@ -51,7 +51,7 @@ static_assert(is_range_adapter_type<RangeAdapter>::value);
 template<RangeAdapterType T>
 struct RangeRef<T>
 {
-    T range;
+    std::remove_reference_t<T> range;
 
     decltype(auto) begin() const
     {
@@ -399,6 +399,26 @@ auto operator|(TIterable&& iterable, Collect<T>)
 {
     return collect<T>(std::forward<TIterable>(iterable));
 }
+
+struct Chain {};
+
+template<typename TIterable>
+struct Chain2
+{
+    RangeRef<TIterable> range;
+};
+
+template<typename TIterable>
+auto operator|(TIterable&& iterable, Chain)
+{
+    return Chain2<TIterable>{.range = {.range = std::forward<TIterable>(iterable)}};
+}
+
+template<typename TFirstIterable, typename TSecondIterable>
+auto operator|(Chain2<TFirstIterable> chain2, TSecondIterable&& secondIterable)
+{
+    return chain(chain2.range.range, std::forward<TSecondIterable>(secondIterable));
+}
 }
 } // namespace mijin