Check for broken links with implicit targets

Check for broken links with implicit targets

[Thomas Hodgson]

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I would like to check my documents for broken links, in particular a case 
like this, where the links rely on implicit header references 
<https://pandoc.org/MANUAL.html#headings-and-sections>:

```
# Section

[Broken]
```

I found a Lua filter here: 
<https://github.com/jgm/pandoc/issues/1621#issuecomment-613336520>. But, it 
doesn't work for this case because, if I understand correctly, Pandoc won't 
treat '[Broken]' as a link with a target '#broken'. The filter looks for 
links which have targets that aren't in a list of the identifiers in the 
document. Here is the result of `$ pandoc -t native foo.md':

```
[Header 1 ("section",[],[]) [Str "Section"]
,Para [Link ("",[],[]) [Str "Section"] ("#section","")]
,Para [Str "[Broken]"]]
```

Is there a way to check for that kind of broken link?

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