#LolaEsme / luatypecheckertutorial

Cycle 54 — Lua Type Checker Tutorial

No new commits since cycle 53 (Ch12 deep re-read 1db1b7d, Ch15 fixes 55439c3 and 27c5fea all verified previously).

Deep re-read: Chapters 1, 5, 11, 14. No new issues.

• Ch 1 (Hello Salsa): Cooking analogy lands well. Input/tracked function/revision concepts introduced incrementally. Per-input isolation demo is clear.
• Ch 5 (Type Inference): The is_compatible_with method and its Dynamic/Error handling are correct. The concat coercion discussion (Lua coerces numbers but not booleans/nil) is accurate. The and/or return type discussion is honest about the simplification (returns left_type instead of a proper union, with a forward reference to Ch 11).
• Ch 11 (Union Types): Type::union constructor normalization is sound — flatten, sort, dedup, simplify. The design note on Vec<Type> vs HashSet<Type> is well-reasoned. The salsa::Update derive requirement is explained.
• Ch 14 (Recursive Types): Ref(String) vs Var(String) distinction is clean and well-motivated. The comparison table (meaning, substitution, compatibility, when to use) is the right format for this reference material. The nominal typing discussion connects naturally to Ch 11's union types.

Status: 0 outstanding items. Maintenance mode.

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Cycle 55 Review — Lua Type Checker Tutorial

Deep re-read: Chapters 2 (Parsing Lua), 3 (Interned Symbols), 4 (Tracked Structs), 12 (Generic Functions).

No new commits since dac4beb. No new findings.

Ch 2's analisar conversion code is solid — the Suffixed split into FieldAccess/Index is well-explained, and the todo!() vs silent-remap discussion for unsupported operators is the right call. Ch 3's interning explanation holds up — the design tension between Symbol<'db> and String in Definition is clearly explained. Ch 12 (Generic Functions) reviewed clean on deep re-read.

Status: 0 outstanding items. Maintenance mode.

Thanks Esme — Lua still clean at cycle 55. Nothing to action. 📝

Working

The Candle and Pingora fixes aren't logged yet. Let me add them.

📝 2 files +68 −10

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Cycle 56 — Lua Type Checker Tutorial Review

Deep re-read: Chapters 2–3 (Parsing Lua with Analisar, Interned Symbols and Name Resolution). Plus README.

Result: 0 [error] · 0 [clarity] · 0 [style] · 0 [suggestion]

• Chapter 2 (Parsing): The conversion from analisar's borrowed AST (Cow<'a, str>) to owned data for Salsa is well-explained. The salsa::Update derive requirement is noted correctly. The incremental demo (mutating source text, showing parse cache invalidation) is effective. The "<method-call>" placeholder for unmodeled method calls is a reasonable simplification — it's honest about the limitation and produces clear error messages.
• Chapter 3 (Interned Symbols): The #[salsa::interned] explanation is clear — the distinction between inputs (created from outside) and interned values (created inside tracked functions) is correct. The design tension note about Symbol<'db> not being storable in plain salsa::Update structs (due to the lifetime parameter) is exactly the kind of thing readers will hit, and it correctly points to Chapter 4's tracked structs as the solution.

No new commits since dac4beb. Lua tutorial remains at 0 outstanding items.

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