Fortunately this hack isn't necessary for rust, shebangs are syntactically valid and single-file scripts can be executed with cargo nightly: https://doc.rust-lang.org/nightly/cargo/reference/unstable.h...
```
$ echo 'fn main() { println!("hello, world!") }' > file.rs; hyperfine --warmup 1 'cargo +nightly -Zscript file.rs'
Benchmark 1: cargo +nightly -Zscript file.rs
Time (mean ± σ): 14.0 ms ± 1.0 ms [User: 7.7 ms, System: 9.7 ms]
Range (min … max): 12.2 ms … 17.5 ms 203 runs