Macro ax_err 

macro_rules! ax_err {
    ($err: ident) => { ... };
    ($err: ident, $msg: expr) => { ... };
}

Convenience method to construct an Err(AxError) type while printing a warning message.

Examples

// Also print "[AxError::AlreadyExists]" if the `log` crate is enabled.
assert_eq!(
    ax_err!(AlreadyExists),
    AxResult::<()>::Err(AxError::AlreadyExists),
);

// Also print "[AxError::BadAddress] the address is 0!" if the `log` crate is enabled.
assert_eq!(
    ax_err!(BadAddress, "the address is 0!"),
    AxResult::<()>::Err(AxError::BadAddress),
);