fix: destructuring snippet arguments (#16068)

Author: paoloricciuti

.changeset/violet-actors-teach.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: destructuring snippet arguments

packages/svelte/src/compiler/phases/3-transform/client/visitors/SnippetBlock.js

@@ -57,7 +57,7 @@ export function SnippetBlock(node, context) {
 		for (const path of paths) {
 			const name = /** @type {Identifier} */ (path.node).name;
 			const needs_derived = path.has_default_value; // to ensure that default value is only called once
-			const fn = b.thunk(/** @type {Expression} */ (context.visit(path.expression)));
+			const fn = b.thunk(/** @type {Expression} */ (context.visit(path.expression, child_state)));
 
 			declarations.push(b.let(path.node, needs_derived ? b.call('$.derived_safe_equal', fn) : fn));
 

packages/svelte/tests/runtime-runes/samples/snippet-destructure-array/_config.js

@@ -0,0 +1,5 @@
+import { test } from '../../test';
+
+export default test({
+	html: `a`
+});

packages/svelte/tests/runtime-runes/samples/snippet-destructure-array/main.svelte

@@ -0,0 +1,9 @@
+<script>
+	let array = $state(['a', 'b', 'c'])
+</script>
+
+{#snippet content([x])}
+	{x}
+{/snippet}
+
+{@render content(array)}