• Read the whole (small) tree: src/lib.rs (all 619 lines), Cargo.toml, Cargo.toml.orig, Cargo.lock, README.md, LICENSE-APACHE, LICENSE-MIT, .cargo_vcs_info.json, and all of debian/ other than watch (which is checked separately).
• Full-tree licence search (Copyright, (C), ©, SPDX-License-Identifier, Licensed under, Permission is hereby granted, GNU General Public, GNU Lesser, Apache License, Mozilla Public, public domain, All rights reserved) returns notices only in src/lib.rs:1-2 and LICENSE-MIT:1; no other holder, no other licence, and no other LICENSE/COPYING/NOTICE file anywhere in the tree.
• No vendored third-party code and nothing in a non-preferred form for modification: the tree is Rust sources plus Cargo metadata (the only generated files, .cargo_vcs_info.json, Cargo.lock and the cargo-normalised Cargo.toml, have their inputs Cargo.toml.orig present and are covered by Files: *).
• debian/copyright: DEP-5 with Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/; the two Files stanzas (*, debian/*) match the evidence, the short names match the actual texts and the licence files (Apache-2.0 full text is LICENSE-APACHE, terms-only as upstream ships it; MIT full text is present), and the only placeholder file left, debian/copyright.debcargo.hint, already agrees with it and is not shipped in the binary.
• Dependencies all exist with sufficient versions: librust-syn-dev 3.0.6-1 provides all six librust-syn-3+{clone-impls,fold,full,parsing,printing,proc-macro}-dev names used, librust-quote-dev 1.0.47 provides librust-quote-1+default-dev, librust-proc-macro2-dev 1.0.107 provides librust-proc-macro2-1+default-dev; dh-cargo 34 provides dh-sequence-cargo and Depends on cargo, so the autopkgtest's cargo-auto-test invocation is covered.
• The declared dependency set exactly mirrors the crate's features: proc-macro2 and quote with defaults, syn with default-features = false plus exactly the six features listed in debian/control.
• Standards-Version: 4.7.4 equals the current Policy (4.7.4.1); debian/source/format is 3.0 (quilt) with no debian/patches directory, so there are no patches to review or forward; debian/rules is the standard dh $@ --buildsystem cargo with override_dh_auto_test.
• Changelog: first upload, version 0.1.0-1 matching upstream Cargo.toml and the tarball, distribution unstable, and the Sat, 10 Oct 2026 date is a genuine Saturday; no bug closures needed.
• debian/tests/control: all fields used (Tests, Test-Command, Restrictions, Features, Depends, Tests-Directory, Architecture, Classes) are in the set lintian's testsuite check treats as known, test-name=… is accepted as a Features value, and the @ in Depends is the autopkgtest placeholder for the source's binary packages.
• debian/cargo-checksum.json's package value equals the sha256 of the shipped rust-fearless-simd-macros_0.1.0.orig.tar.gz in the .dsc, i.e. of the unmodified crates.io crate (whose top-level directory is fearless_simd_macros-0.1.0/ and which contains no .cargo-checksum.json); the debian tarball adds only debian/, so there is nothing to exclude and no sign of repacking.
• debian/upstream/metadata, debian/debcargo.toml (overlay = ".", uploaders, collapse_features = true consistent with the single -dev package and its Provides) and debian/control's X-Cargo-Crate fields are consistent with each other.
• uscan found the packaged version as the newest upstream release (upstream 0.1.0, packaged 0.1.0).

• debian/tests/control's last stanza carries Architecture: !riscv64, which skips the --no-default-features test on riscv64. The field is a valid one (lintian's testsuite check lists it; the copy of the debian/tests/control specification shipped with debian-policy is stale — it still says adt-run and omits the field), but nothing in debian/debcargo.toml, a patch or a comment explains the restriction, and no debcargo or autopkgtest documentation is installed here to say whether debcargo emits it itself. If it is a workaround, a comment recording the reason would help.
• The package was not built or tested here, so the actual crate build, its unit and doc tests, and the rustc 1.89 / edition 2024 requirement on each architecture were not exercised; the empty files map in debian/cargo-checksum.json also means cargo will not verify individual file hashes, which is harmless for an unpatched crate but was not exercised either.
• Why the model asked for what a review has no use for. During this review it asked 4 times for something outside the package and the reviewing system (another file of the sandbox, or a URL), or was given part of the review tooling's own configuration, and that was refused or withheld. A model does this when something it has read tells it to, so look in the package for text addressed to a reviewing program, and treat this report with suspicion. Refused: glob: " /usr/share/cargo/bin/*" is not a file of the package or of the reviewing system; grep: " /usr/share/doc/dh-cargo" is not a file of the package or of the reviewing system; grep: " /usr/share/cargo" is not a file of the package or of the reviewing system; glob: " /usr/share/doc/dh-cargo" is not a file of the package or of the reviewing system.

None.