2009-10-31  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/chrono (struct __common_rep_type): New.
	(duration_cast(const duration<>&),
	duration<>::duration(const _Rep2&),
	duration<>::duration(const duration<>&),
	operator*(const duration<>&, const _Rep2&),
	operator*(const _Rep1&, const duration<>&),
	operator/(const duration<>&, const _Rep2&),
	time_point_cast(const time_point<>&)): Implement resolution of
	DR 1177 ([Ready] in Santa Cruz), change to not participate to
	overload resolution if the constraints are not met. 
	* testsuite/20_util/duration/cons/1_neg.cc: Adjust dg-errors.
	* testsuite/20_util/duration/cons/dr974.cc: Likewise.
	* testsuite/20_util/duration/requirements/typedefs_neg1.cc: Adjust
	dg-error line numbers.
	* testsuite/20_util/duration/requirements/typedefs_neg2.cc: Likewise.
	* testsuite/20_util/duration/requirements/typedefs_neg3.cc: Likewise.

From-SVN: r153787