debug_assert_eq in core - Rust
Description: Asserts that two expressions are equal to each other.

## debug_assert_eq

# Macro debug_assert_eq

1.6.0 · Source

    macro_rules! debug_assert_eq {
        ($($arg:tt)*) => { ... };
    }

Expand description

Asserts that two expressions are equal to each other.

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

Unlike `assert_eq!`, `debug_assert_eq!` statements are only enabled in non optimized builds by default. An optimized build will not execute `debug_assert_eq!` statements unless `-C debug-assertions` is passed to the compiler. This makes `debug_assert_eq!` useful for checks that are too expensive to be present in a release build but may be helpful during development. The result of expanding `debug_assert_eq!` is always type checked.

## §Examples

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