#include #include struct foo { int a; char b; }; int main(int argc, char *argv[]) { struct foo foo = { .a = 1, .b = 2 }, *foop; int *intp = &foo.a; #ifdef FAIL /* b is a char, but intp is an int * */ foop = container_of_var(intp, foop, b); #if !HAVE_TYPEOF #error "Unfortunately we don't fail if we don't have typeof." #endif #else foop = NULL; #endif (void) foop; /* Suppress unused-but-set-variable warning. */ return intp == NULL; }