Macro concordium_std::claim_eq

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

Ensure the first two arguments are equal, just like assert_eq!, otherwise reports an error. Used only in testing.