Failing test for slot binding scope expansion

test/runtime/samples/component-slot-let-named-b/Nested.svelte

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+<script>
+	export let things;
+</script>
+
+<div>
+	{#each things as thing}
+		<slot name="foo" {thing}/>
+	{/each}
+</div>

test/runtime/samples/component-slot-let-named-b/_config.js

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+export default {
+	props: {
+		things: [
+			{ klass: 'small', text: 'One',},
+			{ text: 'Two',},
+			{ klass: 'big', text: 'Ten',},
+		]
+	},
+
+	html: `
+		<div>
+			<div slot="foo"><span class="small">One</span></div>
+			<div slot="foo"><span class="no-class">Two</span></div>
+			<div slot="foo"><span class="big">Three</span></div>
+		</div>`,
+
+	test({ assert, component, target }) {
+		component.things = [
+			{ klass: 'small', text: 'One', },
+			{ text: 'Two', },
+			{ klass: 'big', text: 'Ten', },
+			{ klass: 'huge', text: 'Ten Million', },
+		];
+		assert.htmlEqual(target.innerHTML, `
+		<div>
+			<div slot="foo"><span class="small">One</span></div>
+			<div slot="foo"><span class="no-class">Two</span></div>
+			<div slot="foo"><span class="big">Three</span></div>
+			<div slot="foo"><span class="huge">Ten Million</span></div>
+		</div>`);
+	}
+};

test/runtime/samples/component-slot-let-named-b/main.svelte

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+<script>
+	import Nested from './Nested.svelte';
+
+	export let things;
+</script>
+
+<Nested {things}>
+	<div slot="foo" let:thing class={thing.klass || 'no-class'}>
+		<span>{thing.text}</span>
+	</div>
+</Nested>