re PR c++/52841 (error: type 'Solvable' is not a base type for type 'Resolvable')

2012-06-06  Fabien Chene  <fabien@gcc.gnu.org>

	PR c++/52841
	* parser.c (cp_parser_alias_declaration): Return earlier
	if an error occured.

	* g++.dg/cpp0x/pr52841.C: New testcase.

From-SVN: r188264