Array of refs are not working

[PaulMaly]

Seems original RFC and #1877 propose that we gonna able to do this to collect multiple nodes as refs:

{#each items as item, i}
<a bind:this={elems[i]}>{item}</a>
{/each}

<script>
  let items = [...];
  let elems = [];
</script>

But for now new REPL throws an error "i is not defined": https://v3.svelte.technology/repl?version=3.0.0-alpha12&gist=9e81322e43470ab531eac9c1e79dfe22