OnCancelled on Fiber handle only
Platform spec ADR
OnCancelled on Fiber handle only
Spec standingStandard
- Concurrency package - Contracts and edge cases Send, Receive, Join, Cancel, and Hub normative contracts.
- Concurrency package - Decisions record (legacy index) Migration index pointing to per-decision ADR files under adr/—normative text lives in ADRs, not this page.
- Concurrency package - Design model Package layout, module map, and thin-wrapper rule for Fiber and Channel structs.
- Concurrency package - Examples Illustrative spawn, Channel, and Hub usage (informative).
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| Section id | Required | Found |
|---|---|---|
what-this-feature-specifies | yes | yes |
implementation-anchors | yes | yes |
Full tree: run pnpm verify:platform-spec-layout (writes src/generated/platform-spec-layout-report.json).
Context
Section titled “Context”Authors should not declare cancellation events on arbitrary spawn closures.
Decision
Section titled “Decision”| Rule | Detail |
|---|---|
| Placement | OnCancelled on `Fiber<T>` handle from spawn only |
| Spawn entry | Ordinary `fn(...) -> T`; does not declare OnCancelled |
| Handle | `Fiber<T>` struct wrapping runtime builtins |
Consequences
Section titled “Consequences”Lowering wires cancel slot from handle metadata.
Verification anchors
Section titled “Verification anchors”Semantic + lowering tests for spawn.