Make sure that code blocks have valid syntax and can actually run.
$ ./code-block-checker.php verify:docs /path/to/docs cache.rst controller.rst --env=dev
::error file=cache,line=377::[Invalid syntax] PHP Parse error: syntax error, unexpected token "}"
[ERROR] Build completed with 1 errors
$ ./code-block-checker.php verify:docs /path/to/docs cache.rst controller.rst --env=dev --generate-baseline=baseline.json
$ ./code-block-checker.php verify:docs /path/to/docs cache.rst controller.rst --env=dev --baseline=baseline.json
[OK] Build completed successfully!