`clippy::undocumented_unsafe_blocks` is what makes the SAFETY convention a rule rather than a habit,
and three crates had never adopted it — pf-client-core (91 unsafe items), pf-presenter (123) and
punktfunk-core (167) — while every other subsystem crate denied it. That gap is why the decoders'
`unsafe impl Send`s carried a one-line aside instead of an argument: nothing required one.
pf-client-core and pf-ffvk now deny it, with a proof written for all 58 + 3 sites they had.
⚠️ 44 of those 58 were WINDOWS-ONLY — `clipboard.rs` 24 and `video_d3d11.rs` 20 — and invisible to
the Linux measurement that sized this work at 14. Same trap as the E0133 sweep: a Linux-only survey
of a cross-platform crate undercounts by whatever the `cfg` hides, here by 3x. Landing the deny on
the strength of that number alone would have re-broken Windows CI, which is exactly the mistake this
session already made once with the `warn`-that-was-really-`deny`.
The proofs say what is actually load-bearing rather than restating the call. In `clipboard.rs` that
is the ownership split Win32 requires and nothing in the code stated: `GetClipboardData` returns a
handle BORROWED from the clipboard (never freed here), while `GlobalAlloc` + `SetClipboardData`
TRANSFERS ownership to it (which is why nothing frees that one either) — two opposite rules, three
lines apart. In `video_d3d11.rs` the recurring one is that libav's `get_format` list is
NUL-terminated by `AV_PIX_FMT_NONE`, which is what keeps the walk in bounds.
Remaining: punktfunk-core (~146, of which `abi.rs` is 141) and pf-presenter (~108). Both want the
"state the contract once" treatment — abi.rs's sites are a handful of repeating shapes (`opt_cstr`
on caller C strings, null-guarded out-param writes, forwarding calls), not 141 distinct arguments.
Note the vendored `fec-rs` (18 sites) is a separate path-dependency crate, so it is out of scope
rather than something to prove.
Verified: Linux .21 fmt + both CI clippy steps rc=0; Windows .47 `-p pf-client-core` clippy
`-D warnings` rc=0 (the only place the 44 are visible), plus the full Windows CI clippy set and
pf-capture's 18 tests.
enricobuehler
e1ddd49e37