[wp-trac] [WordPress Trac] #38777: Add method to merge one WP_Error into another

[WordPress Trac]

#38777: Add method to merge one WP_Error into another
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 Reporter:  rmccue                    |       Owner:  dlh
     Type:  feature request           |      Status:  assigned
 Priority:  normal                    |   Milestone:  5.6
Component:  General                   |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  rest-api
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Comment (by johnbillion):

 Are there instances in the REST API where this would be useful right away?

 Minor: I'd like the method naming to be a little clearer, eg.
 `merge_from()` and `export_to()`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38777#comment:20>
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