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Update copilot instructions with test-first approach #18933

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Sep 24, 2025
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Update copilot instructions with test-first approach #18933

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2 changes: 2 additions & 0 deletions .github/copilot-instructions.md
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Expand Up @@ -8,6 +8,8 @@ General guide:
- Avoid external dependencies – the codebase is self-contained (do NOT add new NuGet packages)
- Follow docs/coding-standards.md and docs/overview.md

**Test‑First** (bugs / regressions): Add/adjust a minimal test that fails on current main → confirm it fails → implement fix → run core command and ensure test passes → only then continue.

Plan your task:
1. Write a 1–2 sentence intent (bug fix / API add / language tweak).
2. Identify domain: Language (`LanguageFeature.fsi` touched) vs `src/FSharp.Core/` vs `vsintegration/` vs compiler/service.
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