From c904e21674f805145a69596c54bec20f0f6aca0f Mon Sep 17 00:00:00 2001
From: Mikhail Korepanov <panyakor@gmail.com>
Date: Wed, 17 Apr 2019 01:12:24 +0300
Subject: [PATCH] Fix creation of debugging comment for elements without
 children

---
 .../render-dom/wrappers/shared/create_debugging_comment.ts  | 2 +-
 test/runtime/samples/component-slot-empty-b/Nested.svelte   | 3 +++
 test/runtime/samples/component-slot-empty-b/_config.js      | 3 +++
 test/runtime/samples/component-slot-empty-b/main.svelte     | 6 ++++++
 4 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 test/runtime/samples/component-slot-empty-b/Nested.svelte
 create mode 100644 test/runtime/samples/component-slot-empty-b/_config.js
 create mode 100644 test/runtime/samples/component-slot-empty-b/main.svelte

diff --git a/src/compile/render-dom/wrappers/shared/create_debugging_comment.ts b/src/compile/render-dom/wrappers/shared/create_debugging_comment.ts
index 55d7b307d3..b32d25c1a4 100644
--- a/src/compile/render-dom/wrappers/shared/create_debugging_comment.ts
+++ b/src/compile/render-dom/wrappers/shared/create_debugging_comment.ts
@@ -16,7 +16,7 @@ export default function create_debugging_comment(
 	let d;
 
 	if (node.type === 'InlineComponent' || node.type === 'Element') {
-		d = node.children[0].start;
+		d = node.children.length ? node.children[0].start : node.start;
 		while (source[d - 1] !== '>') d -= 1;
 	} else {
 		d = node.expression ? node.expression.node.end : c;
diff --git a/test/runtime/samples/component-slot-empty-b/Nested.svelte b/test/runtime/samples/component-slot-empty-b/Nested.svelte
new file mode 100644
index 0000000000..008d9e2fbb
--- /dev/null
+++ b/test/runtime/samples/component-slot-empty-b/Nested.svelte
@@ -0,0 +1,3 @@
+<div>
+	<slot name="slot1" />
+</div>
diff --git a/test/runtime/samples/component-slot-empty-b/_config.js b/test/runtime/samples/component-slot-empty-b/_config.js
new file mode 100644
index 0000000000..8c1b13b1d5
--- /dev/null
+++ b/test/runtime/samples/component-slot-empty-b/_config.js
@@ -0,0 +1,3 @@
+export default {
+	html: `<div><input slot="slot1"></div>`
+};
diff --git a/test/runtime/samples/component-slot-empty-b/main.svelte b/test/runtime/samples/component-slot-empty-b/main.svelte
new file mode 100644
index 0000000000..f6e2deee9b
--- /dev/null
+++ b/test/runtime/samples/component-slot-empty-b/main.svelte
@@ -0,0 +1,6 @@
+<script>
+	import Nested from "./Nested.svelte";
+</script>
+<Nested>
+	<input slot="slot1">
+</Nested>