Start introducing more requires clauses.

Reflection/tagged_ctor_arg.h

@@ -9,6 +9,9 @@ static_assert( __cplusplus > 2020'99 );
 #include <type_traits>
 
 #include <Alepha/Concepts.h>
+#include <Alepha/type_lisp.h>
+
+#include <Alepha/Meta/tuple_cat.h>
 
 #include <Alepha/Reflection/detail/config.h>
 
@@ -77,6 +80,13 @@ namespace Alepha::Hydrogen::Reflection  ::detail::  tagged_ctor_arg_m
 		requires( Concepts::ConstructibleFrom< T, Args... > )
 		constexpr void construct( std::tuple< Args... > && );
 
+		template< typename T, typename Tuple >
+		concept ConstructibleWithTuple=
+		requires( Tuple tup )
+		{
+			{ construct< T >( tup ) };
+		};
+
 		template
 		<
 			typename T,
@@ -105,6 +115,15 @@ namespace Alepha::Hydrogen::Reflection  ::detail::  tagged_ctor_arg_m
 			typename tag,
 			std::size_t ... positions
 		>
+		requires
+		(
+			ConstructibleWithTuple
+			<
+				T,
+				Meta::tuple_cat_t<
+						tuple_from_list_t< repeat_t< argument< T >, sizeof...( positions ) > >, std::tuple< tag > >
+			>
+		)
 		struct extract_all_ctor_arguments
 		<
 			T,
@@ -123,6 +142,16 @@ namespace Alepha::Hydrogen::Reflection  ::detail::  tagged_ctor_arg_m
 			>
 		>
 		{
+			static_assert
+			(
+				ConstructibleWithTuple
+				<
+					T,
+					Meta::tuple_cat_t<
+							tuple_from_list_t< repeat_t< argument< T >, sizeof...( positions ) > >, std::tuple< tag > >
+				>
+			);
+
 			template
 			<
 				typename int_const,