Deprecation message support for PHPStan

The end of May brought two exciting releases for PHPStan and the PHPStan Deprecation Rules extension. With the version of PHPStan v0.11.8, descriptions added to the @deprecated tag can be parsed and returned in rule checks. The v0.11.2 of the PHPStan Deprecation Rules extension implements this feature and returns that description instead of a generic "Call to deprecated X Y" messaging.

It is exciting to see this functionality in the wild. The original feature request, from November 2018, required feature development on PHPStan’s phpdoc-parser and PHPStan itself. The first bits of code landed in mid-March and the complete functionality released by the end of May. Gábor Hojtsy has already updated the Upgrade Status module to take advantage of these features.

Drupal Check was a little behind, but the ability to display messages now exists. The v1.0.11 release will display deprecated code usage descriptions. The tool currently requires a development tag of PHPStan until v0.11.9 is released. Drupal Check performs some unique loading techniques to support various ways users are installing the…