Rust: How Option is defined in the std library

[AmitKumarDas]

:nerd_face: There is no special declaration called type :nerd_face: None is no valued struct i.e. kind of Nil :nerd_face: Some is a single valued struct :nerd_face: value constructor

enum Option<T> {
    None,
    Some(T),
}

• Some is a variant or a value constructor for the Option type
• You can think of it as a function with the type fn<T>(value: T) -> Option<T>
• Correspondingly, None is also a value constructor, except it has no arguments.
• You can think of None as a function with the type fn<T>() -> Option<T>