1 /*============================================================================= 2 Boost.Wave: A Standard compliant C++ preprocessor library 3 http://www.boost.org/ 4 5 Copyright (c) 2020 Jeff Trull. Distributed under the Boost 6 Software License, Version 1.0. (See accompanying file 7 LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 8 =============================================================================*/ 9 10 //O --c++20 11 //O -Werror 12 13 // test that __VA_OPT__ cannot be used inside itself 14 15 // gcc detects this at definition time 16 //E t_8_010.cpp(17): error: __VA_OPT__() may not contain __VA_OPT__: FOO 17 #define FOO(...) BAR __VA_OPT__(__VA_OPT__(,) BAZ) BAR 18 19