Assert two expressions are Err(_) and their values are equal.
Pseudocode: (a ⇒ Err(a̅) ⇒ a̅) = (b ⇒ Err(b̅) ⇒ b̅)
use assertables::*; let a: Result<i8, i8> = Err(1); let b: Result<i8, i8> = Err(1); assert_err_eq!(a, b);
assert_err_eq
assert_err_eq_as_result
debug_assert_err_eq