The documentation is quite clear on this point: > The returned iterator will panic during iteration if any argument to the process is not valid Unicode. If thi

The documentation is quite clear on this point: > The returned iterator will panic during iteration if any argument to the process is not valid Unicode. If this is not desired, use the args_os function instead. std::env::args_os encodes paths as an OsString, which is allowed to contain invalid Unicode. You can then perform your own Unicode validation as needed, instead of the "ASAP" behavior of std::env::args. https://doc.rust-lang.org/std/env/fn.args.html https://doc.rust-lang.org/std/env/fn.args.html