[wp-trac] [WordPress Trac] #28135: wp_insert_post returns error for custom post type in 3.9.0

[WordPress Trac]

#28135: wp_insert_post returns error for custom post type in 3.9.0
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 Reporter:  capit0l            |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  3.9.2
Component:  Posts, Post Types  |     Version:  3.9
 Severity:  major              |  Resolution:
 Keywords:                     |     Focuses:
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Comment (by jesin):

 As SergeyBiryukov pointed out I was able to get this notice only if the
 post type is registered **after** `wp_insert_post()`.

 We need a `post_type_exists()` check inside `wp_insert_post()`. I find
 that that this function creates a post even if the `$post_type` is
 registered nowhere. And this inserted post has the non-registered post
 type in the database.

 I am interested to submit a patch for this but how is this error handled?
 Is a `WP_Error` object returned, fallback to default `post` type or
 `_doing_it_wrong()`? I think `WP_Error` is the right option.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28135#comment:4>
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