PR c++/33496
	* pt.c (tsubst_copy) <case SIZEOF_EXPR>: Handle error_mark_node
	returned from tsubst_pack_expansion.
	(tsubst_copy_and_build) <case SIZEOF_EXPR>: Likewise.
	(tsubst_copy_and_build) <case CONSTRUCTOR>: Likewise.

	* g++.dg/cpp0x/variadic76.C: New test.
	* g++.dg/cpp0x/variadic77.C: New test.
	* g++.dg/cpp0x/variadic78.C: New test.

From-SVN: r128630