std::assert_eq - Rust
Description: API documentation for the Rust `assert_eq` macro in crate `std`.
Keywords: rust, rustlang, rust-lang, assert_eq

# Macro std::assert_eq [−]

    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.

# Examples

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

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

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