Type Alias EnvRef 

pub type EnvRef = Rc<RefCell<Environment>>;

The EnvRef type is a reference-counted, mutable reference to an Environment.

The Rc type is used to allow multiple references to the same Environment. This is useful when creating a tree of environments, where each environment can lookup all the variables and functions of it’s parent enviornment.

The RefCell type is used to allow the Environment to be mutable, even when it is shared between multiple references.

Aliased Type

pub struct EnvRef { /* private fields */ }