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clarify design goal of deliberate forward non-compatibility

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Valentin Gagarin 2023-06-14 02:05:58 +02:00 • committed by GitHub
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rfcs/0137-nix-language-version.md
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@ -66,7 +66,7 @@ Other discussions around language changes:
1. New versions of the Nix language evaluator should to stay backward compatible with existing Nix expressions.
1. New Nix expressions should not work with existing evaluators at all.
1. A Nix expression written in a newer version of the language should never work with older evaluators not supporting that version.
1. Changes to the language, especially backward-incompatible changes, should remain a rare exception.