fix: ensure snippet hoisting works in the correct scope (#14642)

* fix: ensure snippet hoisting works in the correct scope

* fix bug

* revert

* revert

Author: trueadm

.changeset/chatty-windows-own.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: ensure snippet hoisting works in the correct scope

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

@@ -99,8 +99,9 @@ function can_hoist_snippet(scope, scopes, visited = new Set()) {
 		if (binding.initial?.type === 'SnippetBlock') {
 			if (visited.has(binding)) continue;
 			visited.add(binding);
+			const snippet_scope = /** @type {Scope} */ (scopes.get(binding.initial));
 
-			if (can_hoist_snippet(binding.scope, scopes, visited)) {
+			if (can_hoist_snippet(snippet_scope, scopes, visited)) {
 				continue;
 			}
 		}

packages/svelte/src/compiler/phases/scope.js

@@ -628,12 +628,8 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
 
 		SnippetBlock(node, context) {
 			const state = context.state;
-			// Special-case for root-level snippets: they become part of the instance scope
-			const is_top_level = !context.path.at(-2);
 			let scope = state.scope;
-			if (is_top_level) {
-				scope = /** @type {Scope} */ (parent);
-			}
+
 			scope.declare(node.expression, 'normal', 'function', node);
 
 			const child_scope = state.scope.child();

packages/svelte/tests/runtime-runes/samples/snippet-hoisting-2/_config.js

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

packages/svelte/tests/runtime-runes/samples/snippet-hoisting-2/main.svelte

@@ -0,0 +1,13 @@
+<script>
+	let abc = 'a'
+</script>
+
+{@render b()}
+
+{#snippet a()}
+	{abc}
+{/snippet}
+
+{#snippet b()}
+	{@render a()}
+{/snippet}

packages/svelte/tests/runtime-runes/samples/snippet-hoisting-3/_config.js

@@ -0,0 +1,5 @@
+import { test } from '../../test';
+
+export default test({
+	html: '<h1>Hello world!</h1>'
+});

packages/svelte/tests/runtime-runes/samples/snippet-hoisting-3/main.svelte

@@ -0,0 +1,13 @@
+<script module>
+	export { foo }
+</script>
+
+<script>
+	let name = 'world';
+</script>
+
+<h1>Hello {name}!</h1>
+
+{#snippet foo()}
+	oo
+{/snippet}