Macro assert_email_address_as_result 

macro_rules! assert_email_address_as_result {
    ($a:expr $(,)?) => { ... };
}

Assert expression is possibly an email address.

• If true, return Result Ok(()).

• Otherwise, return Result Err(message).

This macro is useful for runtime checks, such as checking parameters, or sanitizing inputs, or handling different results in different ways.

Module macros

• assert_email_address
• assert_email_address_as_result
• debug_assert_email_address