Study one C++ semantic rule

Time: About 150 minutes: 45 reading, 75 lab, 20 testing, 10 notes.
Prerequisites: Day 17: Use FileCheck and trace a diagnostic

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

A deliberately narrow slice of Sema.

Read Reading

R9 · Clang internals manual
Relevant Sema discussion · 15 min
Your llvm-project checkout
The implementation and nearby tests for one rule · 30 min

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

Build Build or investigate

Pick one manageable topic: const-related diagnostics, invalid initialization or simple name lookup.
Write five small C++ examples changing one property at a time.
Predict results before compiling.
Find the checking function and record the observed code path.

Done when

A five-case behavior matrix and one function you can explain in your own words.

Recall question

What evidence distinguishes an actual compiler bug from an incorrect expectation about C++?

Completion checks

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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