Method error_msg

crates/vm/src/stdlib/_io.rs:4927–4939

(&self, mode_string: &str)

    impl ParseModeError {
        fn error_msg(&self, mode_string: &str) -> String {
            match self {
                Self::InvalidMode => format!("invalid mode: '{mode_string}'"),
                Self::MultipleFile => {
                    "must have exactly one of create/read/write/append mode".to_owned()
                }
                Self::MultipleEncode => "can't have text and binary mode at once".to_owned(),
                Self::NoFile => {
                    "Must have exactly one of create/read/write/append mode and at most one plus"
                        .to_owned()
                }
            }
        }
    }

    #[derive(FromArgs)]