Macro input_no_eof

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

A macro that:

• reads one line from stdin,
• tries to parse into String,
• treats EOF as an error (no Ok(None)).

Usage:

// No prompt
let line: String = input_no_eof!().unwrap();

// With prompt
let age: i32 = input_no_eof!("Enter your age: ").unwrap();