don't allow children in svelte:options (#11250)

.changeset/smooth-kids-protect.md

@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+breaking: don't allow children in svelte:options

packages/svelte/src/compiler/phases/1-parse/state/element.js

@@ -101,7 +101,7 @@ export default function tag(parser) {
 	if (root_only_meta_tags.has(name)) {
 		if (is_closing_tag) {
 			if (
-				(name === 'svelte:window' || name === 'svelte:body' || name === 'svelte:document') &&
+				['svelte:options', 'svelte:window', 'svelte:body', 'svelte:document'].includes(name) &&
 				/** @type {import('#compiler').ElementLike} */ (parent).fragment.nodes.length
 			) {
 				error(

packages/svelte/tests/compiler-errors/samples/options-children/_config.js

@@ -0,0 +1,9 @@
+import { test } from '../../test';
+
+export default test({
+	error: {
+		code: 'invalid-element-content',
+		message: '<svelte:options> cannot have children',
+		position: [16, 16]
+	}
+});

packages/svelte/tests/compiler-errors/samples/options-children/main.svelte

@@ -0,0 +1 @@
+<svelte:options>contents</svelte:options>