macro_rules! assert_eq {
($left:expr, $right:expr) => { ... };
($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.
let a = 3;
let b = 1 + 2;
assert_eq!(a, b);
assert_eq!(a, b, "we are testing addition with {} and {}", a, b);
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/macro.assert_eq.html