VEXcode sample for causing a Prefetch Error

main.cpp

/*----------------------------------------------------------------------------*/
/*                                                                            */
/*    Module:       main.cpp                                                  */
/*    Author:       Nick Mertin                                               */
/*    Created:      Fri Apr 24 2020                                           */
/*    Description:  V5 project                                                */
/*                                                                            */
/*----------------------------------------------------------------------------*/

// ---- START VEXCODE CONFIGURED DEVICES ----
// ---- END VEXCODE CONFIGURED DEVICES ----

#include "vex.h"

using namespace vex;

int *var;

void foo() {
  int x;
  var = &x;
}

void bar2() {
  // Because of our (artificially simulated) bad luck, this overwrites the
  // address of the next line of code in main() that bar() will attempt to
  // return to.
  *var = 0;
}

void bar() {
  bar2();
}

int main() {
  // Initializing Robot Configuration. DO NOT REMOVE!
  vexcodeInit();

  // This sets var.
  foo();

  // The error happens when this call tries to return.
  bar();
}