Svelte 5 migration: erroneous $state declaration when each block present

[Rich-Harris]

Describe the bug

This...

<script>
  const { foo } = x();
</script>

{#each foo as f}{/each}

...gets turned into this by the migrator:

<script lang="ts">
  const { foo } = $state(x());
</script>

{#each foo as f}{/each}

There's no reason for this to be state.

Reproduction

demo

[dummdidumm]

The problem isn't the migration, it's the analysis phase who falsely gives the variable the state kind. If you look at the output in legacy mode you see that it creates a mutable source.