Markdown parsing confusion with code block after list

[pri22296]

converting the following as markdown_github to html

- Item1
- Item2
```yaml
section:
  - Code Line1
  - Code Line2
```

gives

<ul>
<li>Item1</li>
<li>Item2<br />
```yaml<br />
section:</li>
<li>Code Line1</li>
<li>Code Line2<br />
```</li>
</ul>

while github renders it correctly.

It seems pandoc's markdown_github reader is not able to parse the code block correctly due to presence of - inside the codeblock. If - is removed inside the code block, it is converted correctly.

Pandoc version : 1.19.2

[jgm]

Here's a smaller case (it has nothing to do with markdown_github specifically, so this just uses default pandoc markdown):

% pandoc
- a
```
- b
```
^D
<ul>
<li>a ```</li>
<li>b ```</li>
</ul>

Pandoc's method for identifying the raw text of a list item is apparently not sensitive to fenced code, when there is no blank line before the fence.

[jgm]

Note that pandoc's manual says:

Like regular code blocks, fenced code blocks must be separated
from surrounding text by blank lines.

However, pandoc's markdown doesn't obey this consistently:

% pandoc
a
```
b
```
^D
<p>a</p>
<pre><code>b</code></pre>

And of course, github allows the fences without blank space.

Note: GitHub is now using commonmark, so you could try pandoc -f commonmark. This gives you basic commonmark without the GitHub extensions (e.g. tables), but it might work better in your case.

[jgm]

See #3509 for the best way forward for accurate parsing of markdown_github. However, as the above shows, there are issues here too for pandoc's markdown.