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Malte Ubl
5f169ed6fe
The `f?.()` branch of the optional-chain lowering forwarded a spread
argument list through completeFuncValueArgs but mapped a plain argument
list itself, so an omitted optional parameter was never padded with the
callee's undefined arm. The lib-boundary arity fence then refused the call
("2 arguments where its lowered signature takes 3"), which is what
`callbacks?.onRetryFinished?.(false, attempt)` hit: an unguarded call
completes its arguments, a guarded one did not.
Run both spellings through the same completion. It evaluates inside the
guard, so a nullish callee still evaluates no argument, and a typed rest
now packs from the guarded call too.
Corpus: optional-chained callbacks with a trailing optional parameter and
with a typed rest, through a present, absent, and undefined receiver.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit f574073e2392ec24cd2cfca61651759d3359e603)