PR c++/27804
	* init.c (constant_value_1): Return decl instead of error_mark_node
	for invalid initializers.

	PR c++/27804
	* g++.dg/init/const4.C: New test.
	* g++.dg/init/member1.C: Add error-marker.
	* g++.dg/other/fold1.C: Adjust error-marker.

From-SVN: r114377