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-rw-r--r--include/stc/algo/coroutine.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/stc/algo/coroutine.h b/include/stc/algo/coroutine.h
index 66b54366..6e36750d 100644
--- a/include/stc/algo/coroutine.h
+++ b/include/stc/algo/coroutine.h
@@ -85,6 +85,6 @@ int main(void) {
#define cco_final case -1
#define cco_alive(c) ((c) && (c)->cco_state > 0)
-#define cco_stop(c) ((c)->cco_state = (c)->cco_state ? -1 : -2, c)
+#define cco_stop(c) ((c)->cco_state = ((c)->cco_state > 0 ? -1 : -2), c)
#endif