re PR c++/86499 (lambda-expressions with capture-default are allowed at namespace scope)

	PR c++/86499
	* parser.c (cp_parser_lambda_introducer): Give error if a non-local
	lambda has a capture-default.

	* g++.dg/cpp0x/lambda/lambda-non-local.C: New test.
	* g++.dg/cpp0x/lambda/lambda-this10.C: Adjust dg-error.

From-SVN: r263749

gcc/cp/ChangeLog

+2018-08-21  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86499
+	* parser.c (cp_parser_lambda_introducer): Give error if a non-local
+	lambda has a capture-default.
+
 2018-08-21  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* decl.c (check_static_variable_definition): Change to return void.

gcc/cp/parser.c

@@ -10285,6 +10285,9 @@ cp_parser_lambda_introducer (cp_parser* parser, tree lambda_expr)
     {
       cp_lexer_consume_token (parser->lexer);
       first = false;
+
+      if (!(at_function_scope_p () || parsing_nsdmi ()))
+	error ("non-local lambda expression cannot have a capture-default");
     }
 
   while (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_SQUARE))

gcc/testsuite/ChangeLog

@@ -13,6 +13,10 @@
 	* g++.dg/cpp0x/Wnarrowing12.C: New test.
 	* g++.dg/cpp0x/rv-cast5.C: Add static_cast.
 
+	PR c++/86499
+	* g++.dg/cpp0x/lambda/lambda-non-local.C: New test.
+	* g++.dg/cpp0x/lambda/lambda-this10.C: Adjust dg-error.
+
 2018-08-21  Ed Schonberg  <schonberg@adacore.com>
 
 	* gnat.dg/expr_func7.adb, gnat.dg/expr_func7.ads: New testcase.

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-non-local.C

+// PR c++/86499
+// { dg-do compile { target c++11 } }
+
+auto l1 = [=]{}; // { dg-error "non-local lambda expression cannot have a capture-default" }
+auto l2 = [&]{}; // { dg-error "non-local lambda expression cannot have a capture-default" }
+
+namespace {
+  auto l3 = [=]{}; // { dg-error "non-local lambda expression cannot have a capture-default" }
+  auto l4 = [&]{}; // { dg-error "non-local lambda expression cannot have a capture-default" }
+}

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-this10.C

 // PR c++/54383
 // { dg-do compile { target c++11 } }
 
-auto foo = [&](int a) { return a > this->b; }; // { dg-error "this" }
+auto foo = [&](int a) { return a > this->b; }; // { dg-error "non-local|this" }