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…ays, walk transitions on sink Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…d reproductions Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…ls; edits moved to mutations.py Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…g them), flag-min.py; finding 12 (rwpi segfault), finding 9 variant Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…heck, flag-campaign.sh; stopgaps for findings 9-12 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…but-patched exclusions behind --allow-known; crashes count as ICEs in flag-walk Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…ag-min: numbers out of error signatures; walk saves the A log on a crash Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
…ormat=json (interleaved stderr) Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh
zmaril
marked this pull request as draft
October 8, 2026 16:36
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Enumerates rustc's -C/-Z options, finds which values and pairs it rejects, sizes covering arrays over them, and walks option transitions on fixtures/sink.
rustc/flag-universe.py: domains from options.rs; every value alone, every pair (122,682 compilations).rustc/flag-model.py: PICT model with the constraints found (1 pairwise exclusion, 17 needs;--cargoadds what a real workspace needs;--transitionsdoubles parameters for before/after).rustc/flag-rows.py: compiles each row of a table (1,675 rows checked, 0 rejected).rustc/flag-walk.py: clean A, rebuild B, clean B, compare; a difference is retried against up to 12 clean builds before it counts as reuse.rustc/artifacts.py: session suffixes normalized in.dwonames and inside objects and binaries.docs/flags.md: sizes (pairwise 166 rows for all 206 options, three-way 1,746) and walk results.docs/hunt.md,docs/hunt/*.md,docs/hunt/repro.sh: findings 9 (dylib link failure with -Cno-prepopulate-passes), 10 (ThinLTO input order nondeterminism with -Clto=thin and incremental), 11 (ICE after a -Zprint-type-sizes session). The fact pages are facts for reports, not reports.Stacked on #20.
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https://claude.ai/code/session_018Mnrg9JXj9X1ht6Qkz2ybh