Macro bail 

macro_rules! bail {
    ($ec:expr => $($msg:tt)*) => { ... };
    ($($msg:tt)*) => { ... };
}

Macro to return early with a Err(HyperlightGuestError). Usage:

bail!(ErrorCode::UnknownError => "An error occurred: {}", details);
// or
bail!("A guest error occurred: {}", details); // defaults to ErrorCode::GuestError