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7773c8af2a
Three call sites in webclaw-fetch used .expect("semaphore closed") on
`Semaphore::acquire()`. Under normal operation they never fire, but
under a shutdown race or adversarial runtime state the spawned task
would panic and be silently dropped from the batch / crawl run — the
caller would see fewer results than URLs with no indication why.
Rewritten to match on the acquire result:
- client::fetch_batch and client::fetch_and_extract_batch_with_options
now emit BatchResult/BatchExtractResult carrying
FetchError::Build("semaphore closed before acquire").
- crawler's inner loop emits a failed PageResult with the same error
string instead of panicking.
Behaviorally a no-op for the happy path. Fixes the silent-dropped-task
class of bug noted in the 2026-04-16 audit.
Version: 0.3.14 -> 0.3.15
CHANGELOG updated.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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