WhenAnyError

Classifies completion-only wait failure without changing input ownership.

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Module std.task

import std.task;

Public declaration contracts and authored examples. A page can document several related symbols. Implementation bodies are excluded.

pub enum WhenAnyError

Classifies completion-only wait failure without changing input ownership.

WhenAnyError.NoTasks

NoTasks;

There is no input whose completion can win.

InvalidTask;

At least one input handle is empty.

AllocationFailed;

Native stable wait-set storage cannot be allocated.

Closed;

Runtime root/executor admission is closed.

RetentionUnavailable;

Native frame lifetime cannot be retained for registration.

Cancelled;

Only this aggregate wait was cancelled before publication.

InvalidConfiguration;

Captured executor configuration is invalid.

StartupFailed;

Lazy worker startup failed transactionally.

StorageFailure;

Private preparation storage failed; input owners/results remain unchanged.

Reason: AllocationError;

Documentation snapshot: October 24, 2026 About versions ↗