process_comment: Use last defined callback #3103
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Instead of using the last registered callback, iterate through all callbacks and use the last one that was actually implemented and returned `Some()`. This is essentially when users register more than one parse callback - the process_comment may not be the last.
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Instead of using the last registered callback, iterate through all callbacks and use the last one that was actually implemented and returned
Some().This is essential when users register more than one parse callback.