handle fallback error

Author: trueadm

packages/svelte/tests/runtime-runes/samples/error-boundary-15/Child.svelte

@@ -0,0 +1,9 @@
+<script>
+	function throw_error() {
+		throw new Error('throw_error');
+	}
+</script>
+
+{throw_error()}
+
+<div>Foo</div>

packages/svelte/tests/runtime-runes/samples/error-boundary-15/_config.js

@@ -0,0 +1,9 @@
+import { test } from '../../test';
+
+export default test({
+	mode: ['client'],
+
+	test({ assert, logs }) {
+		assert.deepEqual(logs, ['error caught 1', 'error caught 2']);
+	}
+});

packages/svelte/tests/runtime-runes/samples/error-boundary-15/main.svelte

@@ -0,0 +1,19 @@
+<script>
+	import Child from "./Child.svelte";
+
+	function throw_error() {
+		throw new Error('test')
+	}
+</script>
+
+<svelte:boundary onerror={(e) => console.log('error caught 2')}>
+	<svelte:boundary onerror={(e) => console.log('error caught 1')}>
+		<Child />
+
+		{#snippet failed()}
+			{throw_error()}
+		{/snippet}
+	</svelte:boundary>
+</svelte:boundary>
+
+