Code shared from the Rust Playground

playground.rs

use std::io::{Error, ErrorKind};

enum Command {
    Cmd1,
    Cmd2,
}

struct CmdParseResult ( Result<Command, Error> );

impl <'a>From<&'a str> for CmdParseResult {

    fn from(value: &str) -> Self {
        match value {
            "cmd1" => CmdParseResult(Ok(Command::Cmd1)),
            "cmd2" => CmdParseResult(Ok(Command::Cmd2)),
            _ =>  CmdParseResult(Err(Error::new(ErrorKind::Other, "oh no!")))
        }
    }
}


fn main() {

    let parsing_result: CmdParseResult = "cmd1".into();
    match parsing_result {
        CmdParseResult(Ok(cmd)) => match cmd {
            Command::Cmd1 => println!("cmd1"),
            Command::Cmd2 => println!("cmd2"),
            },
        CmdParseResult(Err(error)) => println!("{}", error)
        
    }

    
    

}