re PR c++/38958 ('unused variable' warning emitted when extending the lifetime of a returned RAII type by holding a reference to const despite delayed destructor side-effects. [dtor])

/cp
2013-06-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/38958
	* decl.c (poplevel): For the benefit of -Wunused-variable see
	through references.

/testsuite
2013-06-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/38958
	* g++.dg/warn/Wunused-var-20.C: New.

From-SVN: r200042