File: main.c

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#include <stdlib.h>
#include <assert.h>

void foo(int argc)
{
  void* x=0;

  if(argc>3)
    x=malloc(4*sizeof(int));
  else
    x=malloc(3*sizeof(int));
  *(int*)x=42;

  x=realloc(x, sizeof(int));

  assert(*(int*)x==42);
}

int main(int argc, char* argv[])
{
//__CPROVER_ASYNC_1:
  foo(argc);

  return 0;
}