Submission #2121998

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Source Code Expand

macro_rules! input {
    ( $( $( $n:ident : $t:ty ),* );* ) => {
        $($(
            let $n: $t;
        )*)*
        {
            let scan = std::io::stdin();
            $(
                let mut line = String::new();
                let mut i = 0;
                scan.read_line(&mut line).unwrap();
                let words: Vec<&str> = line.split_whitespace().collect();
                $(
                    $n = words[i].parse::<$t>().unwrap();
                    i += 1;
                )*
            )*
        }
    }
}

fn main() {
    input!(
        h1:i32;
        h2:i32
    );
    println!("{}", h1-h2);
}

Submission Info

Compile Error

warning: value assigned to `i` is never read, #[warn(unused_assignments)] on by default
  --> ./Main.rs:15:21
   |
15 |                       i += 1;
   |                       ^
...
23 |       input!(
   |  _____- starting here...
24 | |         h1:i32;
25 | |         h2:i32
26 | |     );
   | |______- ...ending here: in this macro invocation

warning: value assigned to `i` is never read, #[warn(unused_assignments)] on by default
  --> ./Main.rs:15:21
   |
15 |                       i += 1;
   |                       ^
...
23 |       input!(
   |  _____- starting here...
24 | |         h1:i32;
25 | |         h2:i32
26 | |     );
   | |______- ...ending here: in this macro invocation

Judge Result