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Malte UblandClaude Opus 5.5
69f3ae8dd9
`child.on("close", async (code) => …)` lowers to a closure returning
Promise<void>, and an annotated `(): number => 5` returns a number. Node
drops every listener's return value: EventEmitter ignores it, and a
returned promise still surfaces its rejection through the runtime's
unhandled-rejection tracking, which fires at settlement, not at the drop.
The listener slot is void, so the closure now adopts it with
coerceToExpected(cb, funcOf(params, VOID)) — the adapter calls the
listener and discards the answer, the shape every other void callback
slot already takes. A returned value that cannot be discarded still
refuses with SC1090.
tests/diagnostics/child-process.ts drops the annotated-listener fence
(Node drops that value too) and its snapshot is re-recorded; the new
corpus program pins the inferred, annotated and async listener shapes
against Node.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>