Rust 1.91.0 Release

// This program demonstrates the newly stabilized `Path::file_prefix` API,
// which is available in Rust 1.91.0 and later. It prints the file prefix
// component of a path, if one exists.

use std::path::Path;

fn main() {
    // A path that has a file prefix (e.g., "foo/bar.txt" has "foo" as the prefix).
    let path = Path::new("foo/bar.txt");

    // `file_prefix` returns an `Option<&Path>` containing the prefix.
    match path.file_prefix() {
        Some(prefix) => println!("File prefix: {}", prefix.display()),
        None => println!("No file prefix found."),
    }
}