Struct Instances 

pub struct Instances { /* private fields */ }

The const stage’s map from canonical name to instantiated module: what makes one name yield one instance.

A caller passes one in and may keep it: within a single load_module it deduplicates the import graph (a diamond shares its instance), and across calls it becomes a host’s module cache, so a module loaded once is not compiled again. Reuse is safe because a name fixes a frame — one name has one set of imports, instantiated leaves-first, so name equality implies frame equality. The cost of keeping it is that a cached name is never recompiled: changed source on disk is not noticed until the entry is dropped.

Implementations

impl Instances

pub fn new() -> Instances

An empty map — one compile’s worth of dedup, nothing carried in.

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

The instance recorded for name, if any.

pub fn insert(&mut self, name: ModuleName, value: Value)

Record value as the instance for name, replacing any earlier one.

pub fn len(&self) -> usize

How many modules the map holds.

pub fn is_empty(&self) -> bool

Whether the map holds no modules.

pub fn names(&self) -> impl Iterator<Item = &ModuleName>

The canonical names the map holds, in insertion order.

Trait Implementations

impl Debug for Instances

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

Formats the value using the given formatter.

impl Default for Instances

fn default() -> Instances

Returns the “default value” for a type.