If you are here looking for the coder module for Backdrop, you probably want one of these two projects instead:
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Coder Review - Reviews your code identifying coding style problems and where updates to the API are required.
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Coder Upgrade - Helps automate some/most of the work required to upgrade a module from Drupal to Backdrop 1.x
If you are porting a module from Drupal 7 to Backdrop, you may want both.