fix slot block lineage - fixes #2124

src/compile/render-dom/wrappers/Element/index.ts

@@ -132,7 +132,7 @@ export default class ElementWrapper extends Wrapper {
 					const name = attribute.getStaticValue();
 
 					if (!(owner as InlineComponentWrapper).slots.has(name)) {
-						const child_block = block.parent.child({
+						const child_block = block.child({
 							comment: createDebuggingComment(node, this.renderer.component),
 							name: this.renderer.component.getUniqueName(`create_${sanitize(name)}_slot`)
 						});
@@ -205,7 +205,8 @@ export default class ElementWrapper extends Wrapper {
 			block.parent.addDependencies(block.dependencies);
 
 			// appalling hack
-			block.parent.wrappers.splice(block.parent.wrappers.indexOf(this), 1);
+			const index = block.parent.wrappers.indexOf(this);
+			block.parent.wrappers.splice(index, 1);
 			block.wrappers.push(this);
 		}
 	}

test/runtime/samples/component-slot-named-c/Nested.svelte

@@ -0,0 +1 @@
+<slot name="name"></slot>

test/runtime/samples/component-slot-named-c/_config.js

@@ -0,0 +1,6 @@
+export default {
+	html: `
+		<span slot="name">Hello</span>
+		<span slot="name">world</span>
+	`
+};

test/runtime/samples/component-slot-named-c/main.svelte

@@ -0,0 +1,11 @@
+<script>
+	import Nested from './Nested.svelte';
+</script>
+
+<Nested>
+	<span slot="name">Hello</span>
+</Nested>
+
+<Nested>
+	<span slot="name">world</span>
+</Nested>