Struct Environment 

pub struct Environment<'a> { /* private fields */ }

Implementations

impl<'a> Environment<'a>

pub fn root() -> Env<'a>

pub fn child(parent: &Env<'a>) -> Env<'a>

pub fn get(&self, name: &str) -> Option<Value<'a>>

Walks up the frame chain; cloning a value is O(1) (Arc).

pub fn defined_here(&self, name: &str) -> bool

pub fn defined_in_ancestors(&self, name: &str) -> bool

pub fn insert(&self, name: &str, v: Value<'a>)

Low-level insertion; the E0301/E0302 rules are enforced by the interpreter.

Trait Implementations

impl Debug for Environment<'_>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.