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How to assert in Rust?

To assert in rust we use function assert!() this function takes first parameters as condition, second parameter is optional and it will be a message in case of failuer.

fn main() {
    // Panics
    assert!(1 == 2);


thread 'main' panicked at 'assertion failed: 1 == 2', src/

Example of rust assert with failure message

fn main() {
    // Panics with a message
    assert!(1 == 2, "Numbers are not equal");


thread 'main' panicked at 'Numbers are not equal', src/


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