Consider this sample code, which accidentally omits a closing tag.

```js
import htm from 'https://unpkg.com/htm?module'
const h = (type, props, ...children) => ({type, props, children});
const html = htm.bind(h)

console.log(JSON.stringify(html`

Hello, world!`));
```

In this case, the user intended to include a closing tag `

`, and so the user's desired logged result is `{"type":"h1","props":null,"children":["Hello, world!"]}`

Actual: `["h1","Hello, world!"]` The element name is incorrectly handled as a text node.

Expected: Throw an exception.

首先使用 htm runtime 執行提供的 tagged-template sample，並重現缺少的 是如何被處理的。追蹤未閉合標籤的 parser 路徑；完成的標準是 sample 拋出 exception，而不是將元素名稱當作文字節點處理，同時有效標籤仍繼續產生預期的物件。

由索引模型根據 Issue 內容生成。