fix: don't hoist listeners that access non hoistable snippets (#15534)

* fix: don't hoist listeners that access non hoistable snippets

* chore: add comment

* chore: fix auto import fumble

Author: paoloricciuti

.changeset/thick-pans-fold.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: don't hoist listeners that access non hoistable snippets

packages/svelte/src/compiler/phases/2-analyze/visitors/Attribute.js

@@ -183,6 +183,15 @@ function get_delegated_event(event_name, handler, context) {
 		const binding = scope.get(reference);
 		const local_binding = context.state.scope.get(reference);
 
+		// if the function access a snippet that can't be hoisted we bail out
+		if (
+			local_binding !== null &&
+			local_binding.initial?.type === 'SnippetBlock' &&
+			!local_binding.initial.metadata.can_hoist
+		) {
+			return unhoisted;
+		}
+
 		// If we are referencing a binding that is shadowed in another scope then bail out.
 		if (local_binding !== null && binding !== null && local_binding.node !== binding.node) {
 			return unhoisted;

packages/svelte/tests/runtime-runes/samples/unhoist-function-accessing-snippet/_config.js

@@ -0,0 +1,12 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target, errors }) {
+		const button = target.querySelector('button');
+		flushSync(() => {
+			button?.click();
+		});
+		assert.deepEqual(errors, []);
+	}
+});

packages/svelte/tests/runtime-runes/samples/unhoist-function-accessing-snippet/main.svelte

@@ -0,0 +1,12 @@
+<script>
+	const log = () => {
+		console.log(snip);
+	}
+	let x = $state(0);
+</script>
+
+<button onclick={log}></button>
+
+{#snippet snip()}
+	snippet {x}
+{/snippet}