open-standards/wai/http-conformance/falsify/reuse-stale.patch
Transaction Science 9786590154 wai: HTTP corpus round 4 — fetch_timed runs the session on a clock: the base ready before its refinement, the deadline from the verifying response, a refinement's whole-object 200 that never reaches the base
- wai_http_vectors: op fetch_timed (a script of base / base_once / refinement / tick
  steps, each at a time on the caller's clock) and ten timed_OS_* cases, held at
  generation to their outcomes: the base ready at the first step; deadlines that pass
  exactly at verification plus the deadline whether the clock was never told, told 0,
  stepped back before or after, or near the end of u64; a refinement 200 carrying the
  whole object with a base or enhancement byte changed, after the base is ready and
  before.
- http_verify.py: the session keeps the caller's clock (on_response carries it), the
  base and its time, frozen verified parts and a tick; a refinement's response keeps
  only its range; fetch_timed. Mutations base-at-done, tick-noop and
  refinement-unclipped each fail the timed cases; falsify/run.sh runs them.
- Falsify patches: base-ready-at-done, tick-noop, refinement-200-whole,
  response-no-clock, deadline-wraps; reuse-stale regenerated for the moved context.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-06 02:46:20 -04:00

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Diff

# must fail: fetch_OD_stale fetch_OT_stale_small
# bytes past covered_len are reused after a mismatch (session::advance_components)
diff --git a/wai/wai-rs/src/http_binding/session.rs b/wai/wai-rs/src/http_binding/session.rs
index ec31518e..d7874048 100644
--- a/wai/wai-rs/src/http_binding/session.rs
+++ b/wai/wai-rs/src/http_binding/session.rs
@@ -728,7 +728,7 @@ impl FetchSession {
self.abandoned.clear();
self.dropped.clear();
self.verified.clear();
- self.drop_from(head.covered_len());
+ let _ = head.covered_len();
self.to_rest(&head, WhyWhole::DigestMismatch { index: i }, Class::Base);
return self.advance_rest();
}