PR c++/27820
	* decl.c (define_label): Return error_mark_node on error.
	* semantics.c (finish_label_stmt): Don't call
	add_stmt for invalid labels.

	* g++.dg/other/label1.C: New test.


Co-Authored-By: Andrew Pinski <pinskia@gmail.com>

From-SVN: r115265