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Comment by eolpin

2 months ago

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...

4 comments

eolpin

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jswny  2 months ago

I wish this was faster, in my tests it’s about 200ms startup consistently on my M4 MacBook. Otherwise very cool

  • eolpin  2 months ago

    Interesting! That seems unexpected, for a minimal hello-world program I'm averaging 14ms after the first execution:

    ```

    $ 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

    ```

    • jswny  2 months ago

      Ah I think it’s because I was testing with an external library in the top level TOML metadata