assert_eq in core - Rust
Description: Asserts that two expressions are equal to each other (using `PartialEq`).

# Macro assert_eq

1.6.0 · Source

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

Expand description

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

Assertions are always checked in both debug and release builds, and cannot be disabled. See `debug_assert_eq!` for assertions that are disabled in release builds by default.

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);