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+# Milestone Delivery :mailbox:
+
+**The [invoice form :pencil:](https://docs.google.com/forms/d/e/1FAIpQLSfmNYaoCgrxyhzgoKQ0ynQvnNRoTmgApz9NrMp-hd8mhIiO0A/viewform) has been filled out correctly for this milestone and the delivery is according to the official [milestone delivery guidelines](https://github.com/w3f/Grants-Program/blob/master/docs/milestone-deliverables-guidelines.md).**  
+
+* **Application Document:** https://github.com/w3f/Grants-Program/blob/master/applications/wasm-opt-for-rust.md
+* **Milestone Number:** 2
+
+**Context**
+
+The goal of this milestone was to integrate [`wasm-opt-rs`] into `cargo-contract`.
+This is the final milestone of the project.
+
+[`wasm-opt-rs`]: https://github.com/brson/wasm-opt-rs
+
+The project completed as expected.
+The `wasm-opt` crate [has been integrated into `cargo-contract`](https://github.com/paritytech/cargo-contract/pull/766).
+There were no new obstacles discovered in M2,
+but there were some positive surprises:
+
+1) [@athei](https://github.com/athei)
+   [submitted a patch to replace `wasm-gc` with `wasm-opt` in `wasm-builder`](https://github.com/paritytech/substrate/pull/12280).
+   The author of Binaryen has been helping meet their requirements.
+2) [@dtolnay](https://github.com/dtolnay),
+   author of `cxx`,
+   extensively reviewed our code and made a number of improvements.
+3) Stellar has begun [integrating it into Soroban](https://github.com/stellar/soroban-cli/pull/236).
+
+**Deliverables**
+
+| Number | Deliverable | Link | Notes |
+| ------------- | ------------- | ------------- |------------- |
+| 0a. | License | https://github.com/brson/wasm-opt-rs/tree/v0.110.1 | |
+| 0b. | Documentation | https://github.com/brson/wasm-opt-rs/tree/v0.110.1 | |
+| 0c. | Testing Guide | https://github.com/brson/wasm-opt-rs/tree/v0.110.1/components/wasm-opt/tests <br> https://github.com/brson/wasm-opt-rs/tree/v0.110.1/components/conformance-tests/tests | |
+| 0d. | Docker | Docker is not required for this project. | |
+| 0e. | Article | https://brson.github.io/2022/10/26/creating-wasm-opt-rust-bindings-with-cxx | |
+| 1. | APIs | https://docs.rs/wasm-opt/0.110.1/wasm_opt <br> https://docs.rs/wasm-opt-cxx-sys/0.110.1/wasm_opt_cxx_sys <br> https://docs.rs/wasm-opt-sys/0.110.1/wasm_opt_sys | |
+| 2. | `cargo-contract` integration | https://github.com/paritytech/cargo-contract/pull/766 | |
+| 3. | CI | https://github.com/brson/wasm-opt-rs/actions | ARM Linux CI is provided through Circle CI and is visible on pull requests, but not on the linked GitHub actions page. |
+
+**Additional Information**
+
+During the M1 review @lucasvanmol [noted that coverage tool `cargo-tarpaulin` segfaults on the `wasm-opt` crate](https://github.com/w3f/Grant-Milestone-Delivery/blob/master/evaluations/wasm-opt-rust_1_lucasvanmol.md).
+We investigated briefly but `tarpaulin` is a complex instrumentation tool and fixing the problem is beyond the scope of this project.
+We don't have evidence that the problem affects embedders of `wasm-opt` beyond perhaps making embedding projects untestable with `tarpaulin`.
+We have noted this caveat in the `wasm-opt` docs.
+We have [filed an issue against `cargo-tarpaulin`](https://github.com/xd009642/tarpaulin/issues/1126).