Enum SpawnError 

pub enum SpawnError {
    BadFunction {
        index: u32,
        table_size: u32,
    },
    VerifyFailed(VerifyError),
    InvalidCapability,
    Unavailable,
    FlowLimit {
        current: usize,
        max: u32,
    },
    SpawnDenied(String),
    NameTaken {
        name: String,
    },
    ThreadSpawnFailed(String),
    VmInit(String),
}

User-facing spawn / load errors (category A in the taxonomy above).

These used to be .expect(...) panics on Runtime::new / spawn / OS thread creation. Panic is reserved for bugs; a bad function index or a refused thread::spawn is an embedder-visible failure and must surface as Result so the host can recover without taking workers down.

Variants

BadFunction

function index is outside the runtime chunk’s function table.

Fields

index: u32

table_size: u32

VerifyFailed(VerifyError)

Chunk failed verification before the runtime could start.

InvalidCapability

Spawn arguments contained an unknown or unusable capability.

Unavailable

Scheduler table poisoned (fail closed).

FlowLimit

Live flow count would exceed crate::RuntimeConfig::max_flows.

Fields

current: usize

max: u32

SpawnDenied(String)

Bytecode spawn failed the quota / SPAWN-right / attenuation check.

NameTaken

crate::ChildSpec::name is already in the runtime registry.

Fields

name: String

ThreadSpawnFailed(String)

OS refused to create a worker / timer / supervisor thread.

VmInit(String)

Vm::new failed for a reason other than a bad function index (mapped from crate::Fault via From).

Trait Implementations

impl Clone for SpawnError

fn clone(&self) -> SpawnError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpawnError

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

Formats the value using the given formatter.

impl Display for SpawnError

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

Formats the value using the given formatter.

impl Eq for SpawnError

impl Error for SpawnError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Fault> for SpawnError

fn from(fault: Fault) -> Self

Converts to this type from the input type.

impl PartialEq for SpawnError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SpawnError