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I wonder if they could after some time make it a "harder" deprecation; fail by default, and enabled only with an `#[allow]` annotation.

• tspiteri 8y ago
  That would still break existing code: you have to change it for it to compile. And if you are going to change the code, it makes more sense to change the code to use pre_exec in an unsafe block than to use before_exec with an #[allow] annotation.