Confusing error message when not closing an element

Example code:

```js
import htm from "htm"

const e = htm`` // element is not closed
```

Being used to write HTML and not having to close every element (especially inputs), i can write this sort of code
With `htm`, i get the following error: `SyntaxError: missing ) after argument list`
This errors seems non-intuitive to me

Start with the provided htm tagged-template example and reproduce the `SyntaxError: missing ) after argument list` result. Trace the parser or error-reporting entry point that handles an unclosed input element, then verify that the resulting diagnostic clearly explains the missing closing element.

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