std::debug_assert_eq!

( $ ( $ arg : tt ) * ) => (
if cfg ! ( not ( ndebug ) ) { assert_eq ! ( $ ( $ arg ) * ) ; } )

Asserts that two expressions are equal to each other, testing equality in both directions.

On panic, this macro will print the values of the expressions.

Unlike assert_eq!, debug_assert_eq! statements can be disabled by passing --cfg ndebug 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.

Example

fn main() { let a = 3; let b = 1 + 2; debug_assert_eq!(a, b); }

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