Enum Collector 

#[non_exhaustive]
pub enum Collector {
    Auto,
    DeferredReferenceCounting,
    Null,
    Copying,
    MarkSweep,
}

Garbage-collector selection, mostly mirroring wasmtime::Collector.

Our interpreter implements a single tracing strategy — non-moving stop-the-world mark-sweep. Auto selects it; Null stays allocate-only (matching wasmtime). The extra Collector::MarkSweep variant names that strategy explicitly (it has no wasmtime analog — naming it keeps us a superset, so drop-in embedder code, which never references it, still compiles). The two collectors we do not implement — Collector::DeferredReferenceCounting and Collector::Copying — are rejected at Engine::new, the same way wasmtime errors when a selected collector is unavailable. See docs/ARCHITECTURE.md §14.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Auto

Automatically select a collector — resolves to non-moving mark-sweep here.

DeferredReferenceCounting

Deferred reference counting — not implemented (rejected at Engine::new).

Null

Allocate-only: never reclaims, traps on heap exhaustion.

Copying

Copying collector — not implemented (rejected at Engine::new).

MarkSweep

Non-moving stop-the-world mark-sweep (our own variant; no wasmtime analog).

Trait Implementations

impl Clone for Collector

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Collector

impl Debug for Collector

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

Formats the value using the given formatter.

impl Default for Collector

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Collector

impl PartialEq for Collector

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Collector