--- /dev/null
+#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(cast_if_type(void *, (expr), (expr), int))
+
+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 cast_if_type is a noop."
+#endif
+#else
+ int x = 0;
+#endif
+ set_some_value(x);
+ return 0;
+}