Provenance Record

Concise Briefing (593 words) with Overview, per-fix sections, update instructions, context and a 'What We Don't Know' list. Within the 300-800 range.

Read all four gzipped snapshots (source-0..3.html.gz), all HTTP 200, no suspicious_patterns. source-0 (Rust Blog 1.99.1, dated Oct. 15, 2026): confirms all three regressions and every quoted phrase verbatim ('fixes the following regressions from prior releases'; the wcslen compiler-builtins fallback sentence; loop-idiom-wcslen 'may introduce calls to wcslen as an optimization'; UEFI 'were broken for any project using std'; 'was also reproducible for similar user code patterns'; FFI bool 'bits 1-7' and 'marked for zero-extension again, as required by the ABI'; rust-lld 'could fail to run if the compiler was invoked without the rustup proxy...'; rpath for libLLVM.dylib; rustup update stable; beta/nightly advice; 'Many people came together to create Rust 1.99.1'). Snapshot is short but complete, so no live re-fetch was needed. source-1 (GitHub release 1.99.1): confirms the three one-line notes quoted ('library: fix missing symbol wcslen on UEFI and embedded targets', 'rustc: fix miscompilation of FFI bool return values on x86_64', 'rust-lld: add the rpath for libLLVM on macOS') and a release timestamp of 16 Oct 04:47 (page datetime 2026-10-16T04:47:44Z), matching the article's UTC claim. source-2 (Rust Blog 1.98.1, Sept. 3, 2026): confirms 'fixes a miscompilation in vtable generation' and the null-pointer vtable sentence verbatim. source-3 (Rust Blog 1.99.0, Oct. 1, 2026): confirms date; Oct 1 to Oct 15 is two weeks. Outlets match (official Rust project blog and GitHub).

Every specific (dates, symbol/pass names, register bits, rpath, commands) traces to a snapshot. Body URLs and article.sources match exactly in both directions (no orphans, no unused sources). Internal link /article/2026-10/03-rust-199-stabilizes-... resolves to an existing published article (correct singular form). validate:content passes for all 10541 files (exit 0). Minor analytical framing ('both address compiler-generated code problems') is hedged by the article itself and is not a factual error.

Clean, fully sourced release briefing. APPROVE.