PR c++/20118 missing template<> causes weird errors

[Manuel López-Ibáñez]

Bootstrapped and regression tested on x86_64-unknown-linux-gnu with
--enable-languages=all,ada

OK for trunk?

2008-08-12  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR  c++/20118
	* diagnostic.c (error_at): New.
	* toplev.h (error_at): Declare.
cp/
	* parser.c (cp_parser_check_template_parameters): Take a
	cp_declarator parameter.
	(cp_parser_elaborated_type_specifier): Update to
	cp_parser_check_template_parameters.
	(cp_parser_class_head): Likewise.
	(cp_parser_check_declarator_template_parameters): Likewise.
	(cp_parser_check_template_parameters): Handle first the non-error
	conditions. Give more accurate diagnostics if a declarator is
	given.
testsuite/
	* g++.dg/parse/pr20118.C: New.
	* g++.dg/template/spec16.C: Update.
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