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I think there should definitely be a global option to disable this during development. This makes temporarily trying something out (e.g commenting out some code to run only part of it) a massive pain, as you have to go up and edit the variable definition as well as the code using it).

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Fully agree. I meet with it mostly in typescript’s linter, but recursively having to comment out things is just simply terrible. Of course it is great for prod, but for debug it is very questionable.

agreed. Rust has a warning for unused items, which is indeed interesting to catch logic errors (variables that should be used, but aren't). No need to fail compilation for this. It is then on you to deny warnings in CI to ensure that they are all handled before the code actually lands

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