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13 Deprecated Features

This appendix lists currently deprecated functionality along with how to replace it.

Starting with Stan 2.29, minor (syntax-level) deprecations can be removed 3 versions after release; e.g., syntax deprecated in Stan 2.20 will be removed in Stan 2.23 and placed in Removed Features. The Stan compiler can automatically update many of these on the behalf of the user for at least one version after they are removed.

Any feature which changes semantic meaning (such as the upgraded ODE solver interface) will not be removed until a major version change (e.g., Stan 3.0).