According to <https://en.cppreference.com/w/cpp/header/cstdbool>,
#include <cstdbool>
is no longer allowed in C++20.
This patch updates our unit test accordingly.
2022-09-10 Bruno Haible <br...@clisp.org>
stdbool C++ tests: Fix for C++20.
* tests/test-stdbool-c++2.cc: Don't include <cstdbool> in C++20 or
newer.
diff --git a/tests/test-stdbool-c++2.cc b/tests/test-stdbool-c++2.cc
index 4d05e8073d..551cbb67a0 100644
--- a/tests/test-stdbool-c++2.cc
+++ b/tests/test-stdbool-c++2.cc
@@ -17,7 +17,7 @@
#define GNULIB_NAMESPACE gnulib
#include <config.h>
-#if __cplusplus >= 201103
+#if __cplusplus >= 201103 && __cplusplus < 202002
# include <cstdbool>
