Macro assert_some_eq

macro_rules! assert_some_eq {
    ($cond:expr, $expected:expr,) => { ... };
    ($cond:expr, $expected:expr) => { ... };
    ($cond:expr, $expected:expr, $($arg:tt)+) => { ... };
}

Asserts that left expression returns Some(T) variant and its value of T type equals to the right expression.

Uses

Assertions are always checked in both debug and release builds, and cannot be disabled. See debug_assert_some_eq! for assertions that are not enabled in release builds by default.

Custom messages

This macro has a second form, where a custom panic message can be provided with or without arguments for formatting. See std::fmt for syntax for this form.

Examples

let maybe = Some(42);

assert_some_eq!(maybe, 42);

// With custom messages
assert_some_eq!(maybe, 42, "Got some value");

None variant will cause panic:

let maybe: Option<i32> = None;

assert_some_eq!(maybe, 42);  // Will panic