re PR c++/44991 (default argument with '<' cause compilation error)

	PR c++/44991
	* parser.c (cp_parser_parameter_declaration): Pop parameter decls
	after tentative parsing.

From-SVN: r163629

gcc/cp/ChangeLog

+2010-08-29  Jason Merrill  <jason@redhat.com>
+
+	PR c++/44991
+	* parser.c (cp_parser_parameter_declaration): Pop parameter decls
+	after tentative parsing.
+
 2010-08-22  Joseph Myers  <joseph@codesourcery.com>
 
 	* Make-lang.in (g++spec.o): Update dependencies.

gcc/cp/parser.c

@@ -15564,6 +15564,7 @@ cp_parser_parameter_declaration (cp_parser *parser,
 			 the default argument; otherwise the default
 			 argument continues.  */
 		      bool error = false;
+		      tree t;
 
 		      /* Set ITALP so cp_parser_parameter_declaration_list
 			 doesn't decide to commit to this parse.  */
@@ -15572,7 +15573,11 @@ cp_parser_parameter_declaration (cp_parser *parser,
 
 		      cp_parser_parse_tentatively (parser);
 		      cp_lexer_consume_token (parser->lexer);
+		      begin_scope (sk_function_parms, NULL_TREE);
 		      cp_parser_parameter_declaration_list (parser, &error);
+		      for (t = current_binding_level->names; t; t = DECL_CHAIN (t))
+			pop_binding (DECL_NAME (t), t);
+		      leave_scope ();
 		      if (!cp_parser_error_occurred (parser) && !error)
 			done = true;
 		      cp_parser_abort_tentative_parse (parser);

gcc/testsuite/ChangeLog

+2010-08-29  Jason Merrill  <jason@redhat.com>
+
+	PR c++/44991
+	* g++.dg/parse/defarg15.C: New.
+
 2010-08-29  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/45439

gcc/testsuite/g++.dg/parse/defarg15.C

+// PR c++/44991
+
+class bar {
+    void foo(bool a = 3 < 2, bool b = true) {}
+};