[rubas-agent]

Before

$ cargo upgrade --dry-run --incompatible allow
name        old req compatible latest new req
====        ======= ========== ====== =======
rustler     0.38.0  0.38.0     0.39.0 0.39.0
parking_lot 0.12.5  0.12.5     0.13.0 0.13.0

cargo update also had 7 newer compatible versions to lock.

Problem

The Rust crates of the NIF were behind their newest releases.

After

Crate	Before	After
parking_lot (direct)	0.12.5	0.13.0
lock_api	0.4.14	0.5.0
parking_lot_core	0.9.12	0.10.0
redox_syscall	0.5.18	0.9.5
cc	1.4.7	1.10.0
either	1.18.0	1.19.0
find-msvc-tools	0.1.13	0.1.15
inventory	0.3.24	0.3.25
libc	0.2.189	0.2.191
smallvec	1.16.1	1.16.3
unicode-ident	1.0.26	1.0.27
rustler (direct)	0.38.0	0.38.0, not changed

rustler stays at 0.38. Version 0.39 links the enif_* functions directly on Linux (rusterlium/rustler#764). The NIF still builds and loads, but cargo test cannot link the test binary, because no BEAM supplies these symbols:

mold: error: undefined symbol: enif_make_map_from_arrays
mold: error: undefined symbol: enif_schedule_nif
...
error: could not compile `whisper_cpp_native` (lib test) due to 1 previous error

The Hex package rustler has no 0.39 release, so mix.exs and mix.lock do not change.

Details

Commits

1. cargo update for the compatible versions.
2. parking_lot 0.12 to 0.13.

parking_lot 0.13. The changelog removes automatic eventual fairness, the hardware-lock-elision feature, the const_* constructors, and the recursive read methods of RwLock. It raises the MSRV to 1.95. The crate uses only Mutex::new and lock() on WhisperResource.ctx (transcribe.rs:transcribe_one). That lock holds only the short create_state() call, so fairness has no effect. We use Rust 1.98.

rustler 0.39. The upgrade guide asks for two changes: OwnedBinary::new, OwnedBinary::from_unowned, and Binary::to_owned are now infallible, and rustler::wrapper is gone. The crate uses none of them, and clippy passed with 0.39. The link error above stopped the bump. To keep 0.39, the unit tests must link without the NIF glue, for example with a separate crate for the pure logic, or the test link must ignore undefined symbols.

Checks

• WHISPER_CPP_BUILD=1 task check: builds the NIF from source, then format, credo, clippy, mix test (62 passed), cargo test (33 passed), and zizmor. All pass.
• WHISPER_CPP_BUILD=1 task test:integration: real inference with the source-built NIF, 86 passed.