Macro assert_contains_as_result 

macro_rules! assert_contains_as_result {
    ($container:expr, $containee:expr $(,)?) => { ... };
}

Assert an expression (such as a string) contains an expression (such as a substring).

Pseudocode:
a.contains(b)

• 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_contains
• assert_contains_as_result
• debug_assert_contains