#[derive(Debug)]
enum LibError {
    ErrorType1,
}

type LibResult<T> = Result<T, LibError>;

#[derive(Debug)]
enum MyError {
    ErrorType1,
}

type MyResult<T> = Result<T, MyError>;

fn lib_function() -> LibResult<()> {
    Err(LibError::ErrorType1)
}

fn my_function() -> MyResult<()> {
    lib_function().map_err(|_| MyError::ErrorType1)?;

    Ok(())
}

fn main() {
    my_function().unwrap();
}