1 files changed, 17 insertions, 0 deletions
diff --git a/lib/ccan/cast/test/compile_fail-cast_signed.c b/lib/ccan/cast/test/compile_fail-cast_signed.c
new file mode 100644
index 00000000000..66bcc0a1b5e
--- /dev/null
+++ b/lib/ccan/cast/test/compile_fail-cast_signed.c
@@ -0,0 +1,17 @@
+#include <ccan/cast/cast.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	unsigned char *uc;
+#ifdef FAIL
+	int
+#else
+	char
+#endif
+		*p = NULL;
+
+	uc = cast_signed(unsigned char *, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
+	return 0;
+}