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Issue title

Duplicated implementation block across source files

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Pick exactly which findings appear in the issue body. By default the top 5 are included. Uncheck noise, check what matters.

Top 5 (default)
Severity Rule Title File:line
MED AIC001 Parallel implementation file sits beside a canonical file lib/mix/lib/mix/tasks/deps.update.ex:1
MED AIC001 Parallel implementation file sits beside a canonical file lib/mix/lib/mix/tasks/deps.clean.ex:1
LOW AIC003 Duplicated implementation block across source files lib/mix/lib/mix/tasks/source.ex:47
LOW AIC003 Duplicated implementation block across source files lib/mix/lib/mix/tasks/profile.tprof.ex:145
LOW AIC003 Duplicated implementation block across source files lib/mix/lib/mix/tasks/profile.tprof.ex:96
LOW AIC003 Duplicated implementation block across source files lib/mix/lib/mix/tasks/profile.eprof.ex:98
LOW AIC003 Duplicated implementation block across source files lib/mix/lib/mix/tasks/escript.install.ex:38
LOW AIC003 Duplicated implementation block across source files lib/mix/lib/mix/tasks/compile.yecc.ex:44
LOW AIC003 Duplicated implementation block across source files lib/elixir/scripts/mix_docs.exs:1
LOW AIC003 Duplicated implementation block across source files lib/elixir/lib/supervisor.ex:805
LOW AIC003 Duplicated implementation block across source files lib/elixir/lib/hash_set.ex:185
LOW AIC003 Duplicated implementation block across source files lib/elixir/lib/gen_event/stream.ex:23
Reset to top 5 12 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `elixir-lang/elixir`

**Score: 85/100 (B+)**  ·  13 findings  ·  scanned 2026-05-16 13:30 UTC  ·  280,057 LOC

| Severity | Count |
|---|---|
| CRITICAL | 0 |
| HIGH | 0 |
| MEDIUM | 2 |
| LOW | 10 |

📊 [Full filterable report](https://repobility.com/scan/7a1de85a-0de6-4baa-9381-affe9f15400d/)  ·  ![scorecard](https://repobility.com/scan/7a1de85a-0de6-4baa-9381-affe9f15400d/report.png?v=1778938234-s2)

### Top findings

1. **MEDIUM** `AIC001` — Parallel implementation file sits beside a canonical file
   `lib/mix/lib/mix/tasks/deps.update.ex:1`
2. **MEDIUM** `AIC001` — Parallel implementation file sits beside a canonical file
   `lib/mix/lib/mix/tasks/deps.clean.ex:1`
3. **LOW** `AIC003` — Duplicated implementation block across source files
   `lib/mix/lib/mix/tasks/source.ex:47`
4. **LOW** `AIC003` — Duplicated implementation block across source files
   `lib/mix/lib/mix/tasks/profile.tprof.ex:145`
5. **LOW** `AIC003` — Duplicated implementation block across source files
   `lib/mix/lib/mix/tasks/profile.tprof.ex:96`

---

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