Index: libcxx/trunk/test/support/archetypes.hpp
===================================================================
--- libcxx/trunk/test/support/archetypes.hpp
+++ libcxx/trunk/test/support/archetypes.hpp
@@ -147,7 +147,7 @@
 protected:
     constexpr static int check_value(int const& val) {
 #if TEST_STD_VER < 14
-      return val == -1 || val == 999 ? TEST_THROW(42) : val;
+      return val == -1 || val == 999 ? (TEST_THROW(42), 0) : val;
 #else
       assert(val != -1); assert(val != 999);
       return val;
@@ -155,7 +155,7 @@
     }
     constexpr static int check_value(int& val, int val_cp = 0) {
 #if TEST_STD_VER < 14
-      return val_cp = val, val = -1, (val_cp == -1 || val_cp == 999 ? TEST_THROW(42) : val_cp);
+      return val_cp = val, val = -1, (val_cp == -1 || val_cp == 999 ? (TEST_THROW(42), 0) : val_cp);
 #else
       assert(val != -1); assert(val != 999);
       val_cp = val;