5.43.0: Cannot destructure property with `@const` if undefined

[henrykrinkle01]

Describe the bug

<script>
	//It works if comment out `await`;
	const obj = await { foo: 'foo' };
</script>

{#if true}
	{@const { foo, bar } = obj}
	{foo}
	{bar}
{/if}

This used to work in 5.42.3. Only happens with async objects.

Reproduction

https://svelte.dev/playground/6e298c8f77a340f5b0d1da9b2f922c43?version=5.42.3
https://svelte.dev/playground/6e298c8f77a340f5b0d1da9b2f922c43?version=5.43.0

Logs

System Info

svelte@5.43.14

Severity

annoyance

[dummdidumm]

We need to take consts inside blocks into account when calculating what they need to wait for (i.e. their blockers)