1 files changed, 23 insertions, 0 deletions
diff --git a/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c
new file mode 100644
index 0000000000..11d42f4c6b
--- /dev/null
+++ b/lib/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c
@@ -0,0 +1,23 @@
+#include <ccan/typesafe_cb/typesafe_cb.h>
+#include <stdbool.h>
+
+static void _set_some_value(void *val)
+{
+}
+
+#define set_some_value(expr)						\
+	_set_some_value(typesafe_cb_cast(void *, long, (expr)))
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+	bool x = 0;
+#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
+#error "Unfortunately we don't fail if typesafe_cb_cast is a noop."
+#endif
+#else
+	long x = 0;
+#endif
+	set_some_value(x);
+	return 0;
+}