+2008-07-08 Chris Fairles <chris.fairles@gmail.com>
+
+ * include/std/type_traits: Add common_type.
+ * testsuite/20_util/common_type/requirements/
+ explicit_instantiation.cc: New.
+ * testsuite/20_util/common_type/requirements/
+ typedefs-1.cc: Likewise.
+