bindable location fix + test

Author: dummdidumm

packages/svelte/src/compiler/phases/2-analyze/validation.js

@@ -891,6 +891,8 @@ export const validation_runes_js = {
 			error(node, 'invalid-rune-args-length', rune, [0, 1]);
 		} else if (rune === '$props') {
 			error(node, 'invalid-props-location');
+		} else if (rune === '$bindable') {
+			error(node, 'invalid-bindable-location');
 		}
 	},
 	AssignmentExpression(node, { state }) {

packages/svelte/tests/compiler-errors/samples/runes-wrong-bindable-placement/_config.js

@@ -0,0 +1,8 @@
+import { test } from '../../test';
+
+export default test({
+	error: {
+		code: 'invalid-bindable-location',
+		message: '$bindable() can only be used inside a $props() declaration'
+	}
+});

packages/svelte/tests/compiler-errors/samples/runes-wrong-bindable-placement/main.svelte

@@ -0,0 +1,3 @@
+<script>
+	const { a = $bindable() } = $state();
+</script>

packages/svelte/tests/compiler-errors/samples/runes-wrong-bindable-placement/main.svelte.js

@@ -0,0 +1 @@
+const { a = $bindable() } = $state();