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Most of these are written in such a way that they don't affect the happy path and if they do their pact is negligible. Are you saying that these checks are completely unnecessary, or are you saying that you'd prefer a faster compiler over one with more checks?

Also, we perform many, many more checks beyond the ones you've mentioned, for example https://play.rust-lang.org/?version=nightly&mode=debug&editi... :)

Edit: To expand on "don't affect the happy path": most of those extra lints, checks and suggestions will be performed only if the error condition has been met. If your code doesn't trigger a mutability error, or a missing identifier error (to take from the parent's examples) the searches for suggestions are never executed. For others like style lints, those add some time to processing, but they are linear in time, we tag things that miss a lint during parsing or other passes and then emit them later.