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plan: Phase 6 ADT design doc — define-type/match syntax, CEK dispatch, exhaustiveness

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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giles
2026-04-26 17:17:14 +00:00
parent 518ad37def
commit 3fb0212414
2 changed files with 262 additions and 1 deletions
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6
plans/agent-briefings/primitives-loop.md
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@@ -171,9 +171,12 @@ Fix O(n²) string concatenation in loops across Lua, Ruby, Common Lisp, Tcl.
The deepest structural gap. Every language uses `{:tag "..." :field ...}` tagged dicts to
simulate sum types. A native `define-type` + `match` form eliminates this everywhere.
- [ ] Design: write `plans/designs/sx-adt.md` covering syntax, CEK dispatch, interaction with
- [x] Design: write `plans/designs/sx-adt.md` covering syntax, CEK dispatch, interaction with
existing `cond`/`case`, exhaustiveness checking, recursive types, pattern variables.
Draft, then stop — next fire reviews design before implementing.
Written: define-type/match syntax, AdtValue runtime rep, stepSfDefineType + MatchFrame
CEK dispatch, exhaustiveness warnings via _adt_registry, recursive types, nested patterns,
wildcard _, 3-phase impl plan (basic/nested/exhaustiveness), open questions on accessors/singletons/inspect.
- [ ] Spec: implement `define-type` special form in `spec/evaluator.sx`:
`(define-type Name (Ctor1 field...) (Ctor2 field...) ...)`
@@ -683,6 +686,7 @@ Brief each language's loop agent (or do inline) after rebasing their branch onto
_Newest first._
- 2026-04-26: Phase 6 Design done — plans/designs/sx-adt.md written. Covers define-type/match syntax, AdtValue CEK runtime, stepSfDefineType+MatchFrame dispatch, exhaustiveness warnings, recursive types, nested patterns, wildcard _. 3-phase impl plan. Next fire: Spec implement define-type.
- 2026-04-26: Phase 5 complete — string buffer fully landed (d98b5fa2). 17 tests, 17/17 OCaml+JS. Phase 6 (ADTs) next.
- 2026-04-26: Phase 5 Spec+OCaml+JS step done — StringBuffer of Buffer.t in sx_types.ml; make-string-buffer/append!/->string/length/string-buffer? in sx_primitives.ml; SxStringBuffer with _string_buffer marker + typeOf/dict? fixes in platform.py; JS rebuilt. 17/17 tests OCaml+JS.
- 2026-04-26: Phase 4 complete — coroutine primitive fully landed (4 commits: spec library + OCaml verified + JS pre-load + 27 tests). Phase 5 (string buffer) next.