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				If an error is raised during a deploy, the task `deploy:failed` will be
triggered.  Custom tasks can hook into this using `after`:
    after 'deploy:failed', :send_for_help do
      #
    end
I've also taken the opportunity to provide a marginally more useful
error message before triggering the task.
By default, this 'deploy:failed' will only be triggered when running
`cap <stage> deploy` - to trigger after individual tasks use `set
:deploying, true`
This closes #708 and replaces
https://github.com/capistrano/capistrano/pull/720
		
	
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| database.cap | ||
| fail.cap | ||
| failed.cap | ||