Horrible C Scope abuse

horrible-c-scope-abuse.c

#include <stdio.h>
#include <stdlib.h>

void
invalid_code(void)
{
  void (^block)(void);
  if (rand() % 2) {
    block = ^{ printf("odd\n"); };
  } else {
    block = ^{ printf("even\n"); };
  }
  block();
}

void
valid_code(void)
{
  void (^block)(void);
  if (rand() % 2)
    block = ^{ printf("odd\n"); };
  else
    block = ^{ printf("even\n"); };
  block();
}