Addresses https://github.com/rust-lang/rust/pull/124636#issuecomment-2132119534. I think that the diff display regresses a little, because it's no longer showing the `+` to show where the `unsafe {}` is added. I think it's still fine.
deprecated_safe
It warns about usages of `std::env::{set_var, remove_var}` with an automatic fix wrapping the call in an `unsafe` block.