File: main.c

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#include <assert.h>
#include <stdbool.h>

// clang-format off
int f1(int *arr)
  __CPROVER_ensures(__CPROVER_forall {
    int i;
    (0 <= i && i < 10) ==> arr[i] == i
  })
// clang-format on
{
  return 0;
}

int main()
{
  int arr[10];

  f1(arr);

  bool check = true;
  for(int i = 0; i < 10; i++)
  {
    if(i == 0)
      check &= (arr[i] = -1);
    else
      check &= (arr[i] = i);
  }
  assert(check);
}