complex (operator+(const complex<>&, const _Tp&), [...]): Do not assume real() returns a reference (against DR 387).

2009-03-10  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/complex (operator+(const complex<>&, const _Tp&),
	operator+(const _Tp&, const complex<>&),
	operator-(const complex<>&, const _Tp&),
	operator-(const _Tp&, const complex<>&)): Do not assume real()
	returns a reference (against DR 387).
	* testsuite/26_numerics/complex/dr387_2.cc: New.

From-SVN: r144770