Struct DynamicEnv 

pub struct DynamicEnv { /* private fields */ }

A stack of dynamic-extent binding frames shared across clones.

Holds the fluid (dynamically scoped) bindings of the binding organ. Frames are pushed for the duration of a body and popped when it returns or unwinds, giving dynamic rather than lexical extent.

Implementations

impl DynamicEnv

pub fn new() -> Self

Creates an empty dynamic environment with no active frames.

pub fn lookup(&self, name: &Symbol) -> Result<Option<Value>>

Returns the innermost binding for name, or None if it is unbound.

pub fn with_bindings<T>( &self, bindings: Vec<(Symbol, Value)>, body: impl FnOnce() -> Result<T>, ) -> Result<T>

Runs body with bindings installed in a fresh frame.

The frame is popped when body returns, including on early return or non-local unwind, so the bindings have dynamic extent only.

Trait Implementations

impl Clone for DynamicEnv

fn clone(&self) -> DynamicEnv

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DynamicEnv

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

Formats the value using the given formatter.

impl Default for DynamicEnv

fn default() -> DynamicEnv

Returns the “default value” for a type.