Struct ExtensionBinding 

pub struct ExtensionBinding {
    pub kind: PackDescriptor,
    pub pack_ref: PackId,
    pub instance_id: Option<String>,
    pub answers_ref: Option<PathBuf>,
    pub generation: u64,
    pub previous_binding_ref: Option<PathBuf>,
}

An open-namespace capability binding (§5.1, Path 3).

Unlike EnvPackBinding it carries no slot field — its slot is always CapabilitySlot::Extension. Its identity is (kind.path(), instance_id): the descriptor path plus an optional instance selector distinguishing N instances of the same extension type. Bindings live in Environment::extensions, never in Environment::packs, so the 1-per-slot rule does not apply; a workload resolves one by name via ext://<path>[/<instance>] (ExtensionRef) — no typed host interface is wired.

Fields

kind: PackDescriptor

pack_ref: PackId

instance_id: Option<String>

Distinguishes N instances of the SAME extension type. None ⇒ the descriptor path is the whole key (the single default instance). A None binding and a Some(..) binding on the same path coexist; two None bindings on the same path collide.

answers_ref: Option<PathBuf>

extensions/<path>[-<instance>]/answers.json (env-relative path).

generation: u64

Bumped on attach/update/remove/rollback.

previous_binding_ref: Option<PathBuf>

Implementations

impl ExtensionBinding

pub fn validate(&self) -> Result<(), SpecError>

Per-document invariants. The (path, instance_id) uniqueness check is a cross-document invariant on Environment::validate where the sibling bindings are in scope.

Trait Implementations

impl Clone for ExtensionBinding

fn clone(&self) -> ExtensionBinding

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExtensionBinding

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ExtensionBinding

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ExtensionBinding

impl PartialEq for ExtensionBinding

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ExtensionBinding

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ExtensionBinding