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Malte UblandClaude Opus 5.5
e41fee0c4a
`return fatal(...)` where `fatal` is declared `Promise<never>` (a throw-only
async helper) is well-typed — `never` converts into anything — but the returned
value flattens through the returned-promise await into a void, which then
fails the async function's declared record result with SC2002 (`expected
'{ cancelled: boolean }', got 'void'`). The IR keeps `Promise<never>` as a
promise with a void payload, exactly like `Promise<void>`, so the two are
indistinguishable by type alone.
The return now asks the TS payload type: a `never` payload means the promise
never settles, so the awaited value is unreachable and fills the declared
result through divergentValue — the same unreachable-value path a
never-returning call already takes in a value position.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>