--- /dev/null
+#include <stdlib.h>
+
+#include <ccan/tcon/tcon.h>
+#include <ccan/build_assert/build_assert.h>
+#include <ccan/tap/tap.h>
+
+struct inner {
+ int inner_val;
+};
+
+struct outer {
+ int outer_val;
+ struct inner inner;
+};
+
+struct info_base {
+ char *infop;
+};
+
+struct info_tcon {
+ struct info_base base;
+ TCON(TCON_CONTAINER(concan, struct outer, inner));
+};
+
+int main(int argc, char *argv[])
+{
+ struct info_tcon info;
+ struct outer ovar;
+#ifdef FAIL
+#if !HAVE_TYPEOF
+#error We cannot detect type problems without HAVE_TYPEOF
+#endif
+ int *innerp = &ovar.outer_val;
+#else
+ struct inner *innerp = &ovar.inner;
+#endif
+
+ return tcon_container_of(&info, concan, innerp) == &ovar;
+}