Support svelte 3.41.0 (#77)

Author: ota-meshi

tests/fixtures/parser/ast/await02-input.svelte

@@ -0,0 +1,17 @@
+<script>
+let expression = new Promise()
+</script>
+
+{#await expression catch}
+	<p>oh no! Something broke!</p>
+{/await}
+
+{#await expression then}
+	<p>the promise is resolved</p>
+{:catch theError}
+	<p>oh no! {theError.message}</p>
+{/await}
+
+{#await expression then}
+	<p>the promise is resolved</p>
+{/await}