define_after_realize.cpp
#include "Halide.h"
#include <stdio.h>
using namespace Halide;
int main(int argc, char **argv) {
Func f, g;
Var x;
f(x) = x;
Buffer<int> im = f.realize(10);
// Now try to add an update definition to f
f(x) += 1;
printf("There should have been an error\n");
return 0;
}