Macro std::assert_eq

macro_rules! assert_eq {
    ($left : expr, $right : expr $(,) ?) => { ... };
    ($left : expr, $right : expr, $($arg : tt) +) => { ... };
}

Asserts that two expressions are equal to each other (using PartialEq).

On panic, this macro will print the values of the expressions with their debug representations.

Like assert!, this macro has a second form, where a custom panic message can be provided.

Examples

let a = 3;
let b = 1 + 2;
assert_eq!(a, b);

assert_eq!(a, b, "we are testing addition with {} and {}", a, b);