also fix snippet block, fixes #16811

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

@@ -3,6 +3,7 @@
 /** @import { ComponentContext } from '../types.js' */
 import { dev } from '../../../../state.js';
 import * as b from '#compiler/builders';
+import { create_async_block } from './shared/utils.js';
 
 /**
  * @param {AST.SnippetBlock} node
@@ -15,6 +16,10 @@ export function SnippetBlock(node, context) {
 		/** @type {BlockStatement} */ (context.visit(node.body))
 	);
 
+	if (node.body.metadata.has_await) {
+		fn.body = b.block([create_async_block(fn.body)]);
+	}
+
 	// @ts-expect-error - TODO remove this hack once $$render_inner for legacy bindings is gone
 	fn.___snippet = true;
 

packages/svelte/tests/server-side-rendering/samples/async-snippet/_expected.html

@@ -0,0 +1 @@
+<div>this should work</div>

packages/svelte/tests/server-side-rendering/samples/async-snippet/main.svelte

@@ -0,0 +1,6 @@
+{#snippet foo()}
+    {@const x = await 'this should work'}
+    <div>{x}</div>
+{/snippet}
+
+{@render foo()}