PR c++/85146
	* cp-tree.h (calculate_bases, calculate_direct_bases): Add complain
	argument.
	* semantics.c (calculate_bases): Add complain argument.  Use
	complete_type_or_maybe_complain instead of just complete_type and
	return an empty vector if it fails.  Move make_tree_vector () call
	after early return.  Formatting fixes.
	(calculate_direct_bases): Likewise.  Call release_tree_vector at the
	end.
	(dfs_calculate_bases_post, calculate_bases_helper): Formatting fixes.
	* pt.c (tsubst_pack_expansion): Adjust calculate_bases and
	calculate_direct_bases callers, formatting fixes.

	* g++.dg/ext/bases2.C: Expect extra error diagnostics.
	* g++.dg/ext/bases3.C: New test.

From-SVN: r259101