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-rw-r--r--Python/thread.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/Python/thread.c b/Python/thread.c
index c440d43ee5..5b8ec10b5c 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -122,6 +122,7 @@ static size_t _pythread_stacksize = 0;
#endif
#ifdef C_THREADS
+#error Mach C Threads are now unsupported, and code will be removed in 3.3.
#include "thread_cthread.h"
#endif