Fail build on broken internal link

[xbc5]

Check List

Please check followings before submitting a new feature request.

• I have already read Docs page
• I have already searched existing issues:
  • post_link should throw error if no slug/post found #1594;
  • post_link should throw error if no slug/post found #4426

Feature Request

Fail build on broken internal links (i.e. when the file cannot be found).

Others

Specifically I mean this:

{% post_link a-non-existent-post-name 'A Title' %}

code

A "Post not found:..." message is inserted, this won't work for CI.

I can use a plugin to test external links, but not internal links. This is because they test the rendered link, which has an href of '#', and essentially valid.