Type Alias zebra_test::transcript::ErrorChecker

pub type ErrorChecker = fn(_: Option<Box<dyn Error + Send + Sync + 'static>>) -> Result<(), Box<dyn Error + Send + Sync + 'static>>;

An error-checking function: is the value an expected error?

If the checked error is the expected error, the function should return Ok(()). Otherwise, it should just return the checked error, wrapped inside Err.