When I wrote the list in consecutive elements of the first end of the list wrapped in p tags.

[cutsea110]

write a markdown text as like below,

--- start ---

- a
- b
- c

- x
- y
- z

--- end ----

we get html as

<ul>
<li>a</li>
<li>b</li>
<li><p>c</p></li>
<li>x</li>
<li>b</li>
<li><p>z</p></li>
</ul>

the last element of lists are wraped in p tags.
This is a bug? or spec?

[jgm]

I don't think it's a bug. The "spec", to the extent there is one for Markdown, is ambiguous about what to do with this kind of mixed tight-and-loose list.

Pandoc's rule is described here:
http://johnmacfarlane.net/pandoc/README.html#compact-and-loose-lists

A list item followed by blank space is treated as a paragraph, unless the whole list is "compact", in which case none of the items will be treated as paragraphs.