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writeonce/docs/stories/language-runtime-database/03-compiler-front.md
shoney.arickathil 5a43210448 docs: compiler front-end specifications and plans (Tasks 2-6) 
- Plan docs: architecture, woc front (Tasks 2-7), emit+e2e (Plan 3), Haxe parity (Plan 8)
- nullable-types implementation plan
- Iteration 3: compiler front story
- Specs: systems track, blue-green VM, log-watcher sample, OOP compiler/VM
- Principles + project structure
- Kanban updated with compiler front-end progress
2026-08-10 09:11:04 +02:00

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Iteration 3 — compiler front (woc)

Format: product/story-iteration-template. Part of Story — one language, one runtime, one database, one binary.

Goals

  • An OCaml, stdlib-only compiler front end: .wo source becomes a typed AST with ownership annotations, or plain, precise diagnostics — the half of the language the developer converses with.
  • Ownership errors read like sentences naming both sites ("moved at pricing.wo:14, used at pricing.wo:17") — the ergonomics bet that makes MVS beat Rust for this audience.

Acceptance Criteria

  • What to achieve?
    • Given the pricing-demo classes,
    • when woc runs its front pipeline (lex → parse → typecheck → ownership),
    • then --dump-ast output matches the golden file and zero diagnostics are emitted.
  • What to achieve?
    • Given a file violating ownership rules (move-after-use, borrow escape, double exclusive borrow),
    • when it compiles,
    • then each violation reports a stable WO-E### code with both source sites, and one bad declaration does not stop diagnosis of the rest of the file.
  • What to achieve?
    • Given a class that satisfies an interface structurally,
    • when typechecking runs,
    • then satisfaction is recognized with no implements declaration, and per-method self mutability is inferred (reads shared, writes exclusive).

Out Of Scope

  • Bytecode emission and running anything (iteration 4).
  • The Haxe-parity adoptions (iteration 5) — milestone grammar only.

Info

  • Newline-significant lexing and the identifier gotchas mirror crates/rt's lexer — grammar parity is a stated contract.
  • Architecture map: docs/plan/compiler/architecture.md (pipeline, module contracts, study references).

Proposed Solution

  • Execute the existing plan: docs/plan/compiler/2026-08-01-woc-compiler-front.md (diagnostics module, lexer, declaration/statement/expression parsers with skip-on-block, typechecker with field-kind derivation, MVS ownership pass producing the four emitter tables, driver + error catalog).