Macro inputln 

macro_rules! inputln {
    () => { ... };
    ($($arg:tt)*) => { ... };
}

A macro that:

• prints the prompt on its own line (with println!),
• then reads one line,
• returns Err(InputError::Eof) if EOF is encountered.
• returns Err(InputError::Parse(e)) if the input cannot be parsed.
• returns Err(InputError::Io(e)) if an IO error occurs.
• otherwise parses into String.

Usage:

let line: String = inputln!("What's your favorite color?").unwrap();