diff --git a/test/iso_week/lastweek_weekday.pass.cpp b/test/iso_week/lastweek_weekday.pass.cpp
index 3ffbb25..39156a6 100644
--- a/test/iso_week/lastweek_weekday.pass.cpp
+++ b/test/iso_week/lastweek_weekday.pass.cpp
@@ -56,7 +56,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::lastweek_weekday>{},
 
 static_assert(std::is_trivially_copyable<iso_week::lastweek_weekday>{}, "");
 static_assert(std::is_standard_layout<iso_week::lastweek_weekday>{}, "");
-static_assert(std::is_literal_type<iso_week::lastweek_weekday>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::lastweek_weekday,
                                                  iso_week::weekday>{}, "");
diff --git a/test/iso_week/weekday.pass.cpp b/test/iso_week/weekday.pass.cpp
index 25b3545..c3d4dfa 100644
--- a/test/iso_week/weekday.pass.cpp
+++ b/test/iso_week/weekday.pass.cpp
@@ -82,7 +82,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::weekday>{}, "");
 
 static_assert(std::is_trivially_copyable<iso_week::weekday>{}, "");
 static_assert(std::is_standard_layout<iso_week::weekday>{}, "");
-static_assert(std::is_literal_type<iso_week::weekday>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::weekday, unsigned>{}, "");
 static_assert( std::is_nothrow_constructible<iso_week::weekday, iso_week::sys_days>{}, "");
diff --git a/test/iso_week/weeknum.pass.cpp b/test/iso_week/weeknum.pass.cpp
index 5e60d77..5d9e809 100644
--- a/test/iso_week/weeknum.pass.cpp
+++ b/test/iso_week/weeknum.pass.cpp
@@ -70,7 +70,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::weeknum>{}, "");
 
 static_assert(std::is_trivially_copyable<iso_week::weeknum>{}, "");
 static_assert(std::is_standard_layout<iso_week::weeknum>{}, "");
-static_assert(std::is_literal_type<iso_week::weeknum>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::weeknum, unsigned>{}, "");
 static_assert(!std::is_convertible<unsigned, iso_week::weeknum>{}, "");
diff --git a/test/iso_week/weeknum_weekday.pass.cpp b/test/iso_week/weeknum_weekday.pass.cpp
index c02c093..e275e6a 100644
--- a/test/iso_week/weeknum_weekday.pass.cpp
+++ b/test/iso_week/weeknum_weekday.pass.cpp
@@ -59,7 +59,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::weeknum_weekday>{}, "
 
 static_assert(std::is_trivially_copyable<iso_week::weeknum_weekday>{}, "");
 static_assert(std::is_standard_layout<iso_week::weeknum_weekday>{}, "");
-static_assert(std::is_literal_type<iso_week::weeknum_weekday>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::weeknum_weekday,
                                                  iso_week::weeknum,
diff --git a/test/iso_week/year.pass.cpp b/test/iso_week/year.pass.cpp
index e554ee9..c62b170 100644
--- a/test/iso_week/year.pass.cpp
+++ b/test/iso_week/year.pass.cpp
@@ -72,7 +72,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::year>{}, "");
 
 static_assert(std::is_trivially_copyable<iso_week::year>{}, "");
 static_assert(std::is_standard_layout<iso_week::year>{}, "");
-static_assert(std::is_literal_type<iso_week::year>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::year, int>{}, "");
 static_assert(!std::is_convertible<int, iso_week::year>{}, "");
diff --git a/test/iso_week/year_lastweek.pass.cpp b/test/iso_week/year_lastweek.pass.cpp
index 8874472..60486bb 100644
--- a/test/iso_week/year_lastweek.pass.cpp
+++ b/test/iso_week/year_lastweek.pass.cpp
@@ -64,7 +64,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::year_lastweek>{}, "")
 
 static_assert(std::is_trivially_copyable<iso_week::year_lastweek>{}, "");
 static_assert(std::is_standard_layout<iso_week::year_lastweek>{}, "");
-static_assert(std::is_literal_type<iso_week::year_lastweek>{}, "");
 
 static_assert(std::is_nothrow_constructible<iso_week::year_lastweek,
                                                 iso_week::year>{}, "");
diff --git a/test/iso_week/year_lastweek_weekday.pass.cpp b/test/iso_week/year_lastweek_weekday.pass.cpp
index 5f65f6f..1cdc3ee 100644
--- a/test/iso_week/year_lastweek_weekday.pass.cpp
+++ b/test/iso_week/year_lastweek_weekday.pass.cpp
@@ -65,7 +65,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::year_lastweek_weekday
 
 static_assert(std::is_trivially_copyable<iso_week::year_lastweek_weekday>{}, "");
 static_assert(std::is_standard_layout<iso_week::year_lastweek_weekday>{}, "");
-static_assert(std::is_literal_type<iso_week::year_lastweek_weekday>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::year_lastweek_weekday,
                                                  iso_week::year, iso_week::weekday>{}, "");
diff --git a/test/iso_week/year_weeknum.pass.cpp b/test/iso_week/year_weeknum.pass.cpp
index 6e9d4b6..08d495b 100644
--- a/test/iso_week/year_weeknum.pass.cpp
+++ b/test/iso_week/year_weeknum.pass.cpp
@@ -65,7 +65,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::year_weeknum>{}, "");
 
 static_assert(std::is_trivially_copyable<iso_week::year_weeknum>{}, "");
 static_assert(std::is_standard_layout<iso_week::year_weeknum>{}, "");
-static_assert(std::is_literal_type<iso_week::year_weeknum>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::year_weeknum,
                                                  iso_week::year,
diff --git a/test/iso_week/year_weeknum_weekday.pass.cpp b/test/iso_week/year_weeknum_weekday.pass.cpp
index 0540f97..8ca1c79 100644
--- a/test/iso_week/year_weeknum_weekday.pass.cpp
+++ b/test/iso_week/year_weeknum_weekday.pass.cpp
@@ -69,7 +69,6 @@ static_assert( std::is_trivially_move_assignable<iso_week::year_weeknum_weekday>
 
 static_assert(std::is_trivially_copyable<iso_week::year_weeknum_weekday>{}, "");
 static_assert(std::is_standard_layout<iso_week::year_weeknum_weekday>{}, "");
-static_assert(std::is_literal_type<iso_week::year_weeknum_weekday>{}, "");
 
 static_assert( std::is_nothrow_constructible<iso_week::year_weeknum_weekday,
                                                  iso_week::year, iso_week::weeknum,