[sergo] Sergo Report: Registry-Restructure-Audit-Clean-Sweep - 2026-09-06

[github-actions[bot]]

Executive summary

Registry grew 43 → 67 analyzers since the last run — the biggest single-run jump on record — and the registration mechanism itself changed structurally: cmd/linters/main.go no longer lists analyzers inline; it now just calls linters.All(), whose canonical source is pkg/linters/registry.go. I updated the detection methodology in memory accordingly (the old grep -c Analyzer main.go trick is dead).

Strategy split 50/50: cached = re-verify the sg60a1 (writebytestring) compile-bug fix landed; new = audit the 24 newly-registered/previously-unaudited linters for recurrence of known bug classes. Both came back clean — zero new issues filed this run. That's a deliberate, evidence-backed outcome, not a shortfall: see rationale below.

Cached component — sg60a1 reverification

The writebytestring autofix-doesn't-compile bug (filed at R60) and its follow-ups are all landed and closed:

• writebytestring (new 43rd linter): autofix emits non-compiling io.WriteString(w, s) for named string types + missing RunWithSugg [Content truncated due to length] #44187 — core fix (named-string / io.WriteString assignability)
• writebytestring autofix references io.WriteString but never adds the "io" import — non-compiling fix when the file doesn't alrea [Content truncated due to length] #44653 — missing io import
• Autofix import robustness: sprintfint/writebytestring/bytescomparestring key import-presence on the path but emit a hardcoded pa [Content truncated due to length] #45037 — hardcoded import-presence path
• Enforce-readiness: 5 unenforced linters (writebytestring, lenstringsplit, stringreplaceminusone, osgetenvlibrary, ossetenvlibrar [Content truncated due to length] #49469 — enforce-readiness

New-exploration component — 13-linter clean sweep

Audited every linter I hadn't seen referenced in the ~130 historical sergo issues: bytesbufferstring, mapdeletecheck, nilctxpassed, sprintfbool, stringsindexhasprefix, uncheckedflushreturn, walkfuncerrshadow, trimleftright, globwalkignorederror, ioutildeprecated, logfatallibrary, sprintferrorsnew, lenstringzero.

Checked each against every known bug pattern in memory: syntactic vs type-resolved package matching, FuncLit scope-boundary walks, nolint/test-skip wiring, comment-clobbering SuggestedFix spans, and the sg60a1-class exact-type-vs-Underlying() assignability bug. Result: all 13 use astutil.IsPkgSelector/type info correctly, wire nolint.HasDirectiveForLinter, and call filecheck.ShouldSkipFilename (which already combines test-file and generated-file skip — no separate gap to find). All 67 analyzers are present in .github/workflows/cgo.yml LINTER_FLAGS for both native and wasm jobs, so nothing is sitting unenforced.

One specific worth noting: walkfuncerrshadow (flags err := filepath.Walk(..., func(..., err error) error {...}) shadowing) has zero production violations — a full-repo grep confirms every real call site already uses the walkErr naming convention specifically to avoid this. The linter is correct and already enforced; there's nothing to file.

Calibration refinement (recorded in memory for future runs): the sg60a1 bug class — t.Underlying() == types.String matching named string types when a fix requires an exact type — only bites when the SuggestedFix replacement feeds an exact-type function call parameter (e.g. io.WriteString(w, s)). It does not apply to comparison/binary-expression contexts: lenstringzero's fix rewrites len(s) == 0 → s == "", and s == "" compiles fine for named string types because the untyped "" constant adapts. Cross-referencing every linter that pairs SuggestedFix with an Underlying()-based type check turned up only writebytestring (fixed), bytescomparestring (comment-guard, already tracked), and lenstringzero (safe) — no new instance of the bug.

Reconciliation spot-check

Verified #57339 (sprintferrdot verb-set bug) against current code: still broken exactly as described — # flag still silently dropped at line 142, q/x/X verbs still excluded at line 75. Confirmed still open and accurate, not stale.

Why zero issues this run

Every real gap surfaced during this audit was already tracked by an existing open issue: #58376 (13-linter comment-guard gap, includes several of the linters I checked), #58150 (goroutinemissingrecover placement), #57606 (generatedyamlheredoc heredoc detection), #57340 (stringsconcatloop), #57339 (sprintferrdot, reconciled above). Filing near-duplicates against a registry this well-tracked would just be noise.

Tasks generated (recommendations, no new issues needed)

1. Registry-detection methodology fix — done this run: future runs must count pkg/linters/registry.go's allAnalyzers (or read doc.go's header) instead of grepping main.go.
2. Bug-class calibration — done this run: added the exact-type-vs-comparison-context distinction to memory so future SuggestedFix probes target the right shape.
3. Next-run focus — R62 should: (a) look for cross-linter interaction gaps among the 24 newly-registered analyzers rather than single-file bugs (e.g. does nilctxpassed overlap wgdonenotdeferred's goroutine-launch patterns?), (b) re-check goroutinemissingrecover: recover-defer placed after risky code is accepted as safe, but never protects earlier statements #58150/stringsconcatloop: self-referential ASSIGN form misses map-index/selector accumulators #57340/generatedyamlheredoc: literal << inside a quoted shell string is misreported as a heredoc #57606 for staleness the way sprintferrdot: verb-set check still wrong both directions after issue 40434 closed #57339 was checked here, (c) watch registry.go's count for a 68th linter.

Metrics

• Registry: 43 → 67 analyzers (+24)
• Linters audited this run: 13 (new/previously-unaudited) + 1 reconciliation spot-check
• New issues filed: 0 (all real gaps already tracked)
• Cached bugs reverified landed: 4 (sg60a1 chain)
• Success score: 6/10 — thorough, evidence-backed clean sweep; scored below a findings-producing run because no new actionable issue was produced, but the negative result is itself verified and the registry-detection fix + calibration refinement have lasting value for future runs.

References:

• §34009792483

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