PR c++/86728 - C variadic generic lambda.

	* parser.c (cp_parser_parameter_declaration): Don't turn 'auto' into
	a pack if it's followed by a declarator-id.

From-SVN: r263484

gcc/cp/ChangeLog

+2018-08-10  Jason Merrill  <jason@redhat.com>
+
+	PR c++/86728 - C variadic generic lambda.
+	* parser.c (cp_parser_parameter_declaration): Don't turn 'auto' into
+	a pack if it's followed by a declarator-id.
+
 2018-08-08  Jakub Jelinek  <jakub@redhat.com>
 
 	P0595R1 - is_constant_evaluated

gcc/cp/parser.c

@@ -21722,7 +21722,8 @@ cp_parser_parameter_declaration (cp_parser *parser,
      parameter was introduced during cp_parser_parameter_declaration,
      change any implicit parameters introduced into packs.  */
   if (parser->implicit_template_parms
-      && (token->type == CPP_ELLIPSIS
+      && ((token->type == CPP_ELLIPSIS
+	   && declarator_can_be_parameter_pack (declarator))
 	  || (declarator && declarator->parameter_pack_p)))
     {
       int latest_template_parm_idx = TREE_VEC_LENGTH

gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic19.C

+// PR c++/86728
+// { dg-do compile { target c++14 } }
+
+auto c = [](auto x ...) { };