Automatically replace all try!() with `?`

If you've got code that still uses the try!() macro, you can quickly and accurately upgrade it to the ? operator. Create rules.rs file with: fn rule1<T,E,X: From<E>>(r: Result<T,E>) -> Result<T,X> { replace!(r#try!(r) => r?); unreachable!() } Then run: rustup update cargo +nightly install rerast cargo +nightly rerast --rules_file=rules.rs --force and poof! the macro will be gone. Rerast operates o