* include/std/tuple (_ImplicitlyDefaultConstructibleTuple): New.
* include/std/tuple (tuple<_Types...>::tuple()): Use it.
* testsuite/20_util/declval/requirements/1_neg.cc: Adjust.
- * testsuite/20_util/is_implicitly_default_constructible/requirements/explicit_instantiation.cc: New.
- * testsuite/20_util/is_implicitly_default_constructible/requirements/typedefs.cc: Likewise.
- * testsuite/20_util/is_implicitly_default_constructible/value.cc: Likewise.
+ * testsuite/20_util/is_implicitly_default_constructible/
+ requirements/explicit_instantiation.cc: New.
+ * testsuite/20_util/is_implicitly_default_constructible/requirements/
+ typedefs.cc: Likewise.
+ * testsuite/20_util/is_implicitly_default_constructible/value.cc:
+ Likewise.
* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Adjust.
- * testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc: Likewise.
+ * testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
+ Likewise.
* testsuite/20_util/pair/cons/explicit_construct.cc: Likewise.
* testsuite/20_util/tuple/cons/explicit_construct.cc: Likewise.