Read the contribution rules and a small merged change

Time: About 150 minutes: 45 reading, 75 lab, 20 testing, 10 notes.
Prerequisites: Day 19: Debug the frontend

Toolchain: current-main build

Use build/bin/clang++ and build/bin/llvm-lit from your llvm-main checkout, not whichever clang++ is first on PATH. Reproduce upstream behavior on current main and record the commit SHA. Setup guide

Learn

Patch scope, style, review and attribution.

Read Reading

R13 · Contribution process + R14 + R15 + R16
Relevant contributor, GitHub, coding and AI-use guidance (R13–R16) · 45 min

Reading budgets cover selected sections, not whole chapters. Link to the book; this site does not reproduce it.

Build Build or investigate

Find one small merged Clang PR touching your chosen area.
Read its problem statement, diff, test and review discussion.
Summarize why the test belongs in that directory and what the reviewer requested.
Record the PR link; do not copy its solution.

Done when

A short review study and a personal checklist for an understandable, tested patch.

Recall question

What makes this change useful enough to justify reviewer time?

Completion checks

Progress tracking needs JavaScript. The lesson above is complete without it.

Notes

Saved only in this browser. Keep it short enough to finish in ten minutes; none of the prompts are required. All notes, export and import