Arguments with spaces passed to the program incorrectly

[Tommi Komulainen]

Given the following code

fn main() {
    let arg = std::env::args().nth(1).unwrap();
    if arg.contains(" ") {
        loop{}
    }
}

profiling it with cargo instruments "space here" completes in few seconds as the single argument appears to get split and passed as two arguments "space" and "here" separately.

[Colin Rofls]

are you trying to pass arguments through to the target? I think the syntax is cargo instruments -- your args, does that work?

[Tommi Komulainen]

Yes. And no, -- makes no difference.

[Colin Rofls]

Okay I'm probably not going to have time to investigate this for a while, but if you're motivated I would certainly accept a patch.

[Tommi Komulainen]

After some investigation I see cargo-instruments is simply passing the arguments to instruments and it's the latter that is misbehaving as can be reproduced with

instruments -t "Time Profiler" ./target/debug/main "space here"

Not sure there's anything one can do other than complaining to Apple.

[Colin Rofls]

yea you can file a radar but I wouldn't expect anything to come of it.

Best case scenario is likely that they end up using more Rust and end up using this utility and someone internal hits this bug 😆.