Macro safe_lock_option 

macro_rules! safe_lock_option {
    (is_none: $lock_name:expr) => { ... };
    (is_some: $lock_name:expr) => { ... };
    (take: $lock_name:expr) => { ... };
    (take: $lock_name:expr, $field_name:ident) => { ... };
    (replace: $lock_name:expr, $value:expr) => { ... };
    (replace: $lock_name:expr, $field_name:ident, $value:expr) => { ... };
}