re PR c++/60361 (unexpected 'use of parameter outside function body' error)

PR c++/60361
	* parser.c (cp_parser_template_id): Don't set up a CPP_TEMPLATE_ID
	if re-parsing might succeed.
	* semantics.c (finish_id_expression): Use of a parameter outside
	the function body is a parse error.

From-SVN: r208351

gcc/cp/ChangeLog

@@ -1,5 +1,11 @@
 2014-03-05  Jason Merrill  <jason@redhat.com>
 
+	PR c++/60361
+	* parser.c (cp_parser_template_id): Don't set up a CPP_TEMPLATE_ID
+	if re-parsing might succeed.
+	* semantics.c (finish_id_expression): Use of a parameter outside
+	the function body is a parse error.
+
 	* parser.c (cp_parser_mem_initializer): Set input_location
 	properly for init-list warning.
 	(cp_parser_postfix_open_square_expression): Likewise.

gcc/cp/parser.c

@@ -13466,7 +13466,12 @@ cp_parser_template_id (cp_parser *parser,
      the effort required to do the parse, nor will we issue duplicate
      error messages about problems during instantiation of the
      template.  */
-  if (start_of_id)
+  if (start_of_id
+      /* Don't do this if we had a parse error in a declarator; re-parsing
+	 might succeed if a name changes meaning (60361).  */
+      && !(cp_parser_error_occurred (parser)
+	   && cp_parser_parsing_tentatively (parser)
+	   && parser->in_declarator_p))
     {
       cp_token *token = cp_lexer_token_at (parser->lexer, start_of_id);
 

gcc/cp/semantics.c

@@ -3246,7 +3246,7 @@ finish_id_expression (tree id_expression,
 	  && DECL_CONTEXT (decl) == NULL_TREE
 	  && !cp_unevaluated_operand)
 	{
-	  error ("use of parameter %qD outside function body", decl);
+	  *error_msg = "use of parameter outside function body";
 	  return error_mark_node;
 	}
     }

gcc/testsuite/g++.dg/parse/ambig7.C

@@ -0,0 +1,16 @@
+// PR c++/60361
+
+struct Helper
+{
+  Helper(int a, void (*pfunc)());
+};
+
+template <int I> void function();
+
+const int A = 1;
+const int B = 2;
+
+Helper testOk(A, function<A>);
+Helper testOk2(int(A), function<B>);
+Helper testOk3((int(A)), function<A>);
+Helper testFail(int(A), function<A>);

gcc/testsuite/g++.dg/parse/parameter-declaration-2.C

@@ -1,2 +1,2 @@
-void f (int i, int p[i]); // { dg-error "use of parameter .i. outside function body" }
+void f (int i, int p[i]); // { dg-error "use of parameter.*outside function body" }
 // { dg-prune-output "array bound" }

gcc/testsuite/g++.dg/parse/typename7.C

@@ -7,10 +7,9 @@
 
 struct A
 {
-  template<typename>   void foo(int); // { dg-message "note" }
-  template<typename T> void bar(T t) { // { dg-message "note" }
+  template<typename>   void foo(int);
+  template<typename T> void bar(T t) {
     this->foo<typename T>(t); } // { dg-error "expected|parse error|no matching" }
-  // { dg-message "candidate" "candidate note" { target *-*-* } 12 }
   template<typename T> void bad(T t) {
     foo<typename T>(t); } // { dg-error "expected|parse error|no matching" }
 };
@@ -20,7 +19,6 @@ struct B
 {
   void bar(T t) {
     A().bar<typename T>(t); } // { dg-error "expected|parse error|no matching" }
-  // { dg-message "candidate" "candidate note" { target *-*-* } 22 }
   void bad(T t) {
     B<typename T>::bar(t); } // { dg-error "invalid|qualified-id|not a template" }
 };