shoney.arickathil
4f570a74e6
The type system now keeps its nullability promise: a `?T` value cannot be
used, stored, or dereferenced as a plain `T` without narrowing. The canonical
evidence probe (return b.v where v: ?Int, fn -> Int) that compiled clean for
months now fails with WO-E211.
- WO-E211 (un-narrowed use): arithmetic and </<=/>/>= operands, and/or
operands (?Bool), interpolation segments, for-iterables, and returns whose
declared type is not nullable.
- WO-E212 (boundary): nil or ?T stored into a non-nullable slot — annotated
let, assignment to a confidently-typed local (cenv, never the placeholder
env — a placeholder target must stay silent) or a resolvable class field.
- WO-E213 (deref): field/index access through a possibly-nil base.
- Narrowing (locals only — a field place can be re-assigned between check
and use, so chains bind to a local first): `if x != nil { }` narrows the
branch; a DIVERGING then-branch (`if x == nil { return }`) narrows after
the if; `x != nil and x.n > 3` narrows and/or right operands
(short-circuit); `while x != nil` narrows the body. The narrow is
un-applied when an else-less then-env leaks out un-diverged (the existing
env-leak convention must not leak the narrow).
- No false positives by construction: env/cenv types are declared or
confidently inferred; the placeholder fallbacks are plain scalars, never
?T. The whole golden suite passed untouched (540/0).
- Samples updated to the bind-then-narrow idiom (log-watcher config decode +
supervisor lock/next_fire, gc-cycle ring print) — 22 genuine unnarrowed-nil
sites; employee needed zero changes. All acceptances green.
- Corpus: compile-fail/{nullable-unnarrowed-use,nullable-nil-into-plain,
nullable-deref-unchecked} + run/nullable-narrowing (all four forms) — 83/0.
- Catalog: E211/E212/E213 move from "Reserved, not yet emitted" to the main
table; nullable-types-implementation.md status flipped to ENFORCED
(historical record kept); plan 8 Task 6 ticked (boxed scalar cells
superseded by WO_NIL_SCALAR); board updated.
Verified: woc-test 540/0 + test_diag 14/0; oop-e2e 83/0; oop-accept ALL MET;
log-watcher 7/0; employee 8/0; gc-cycle ring prints + reclaims.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
|
||
|---|---|---|
| .. | ||
| 00-wob-format.md | ||
| 01-error-catalog.md | ||
| 02-corpus.md | ||
| 04-db-binding.md | ||
| 08-builtin-surface.md | ||
| README.md | ||
docs/plan/oop-vm/ — OOP + systems track contracts
The normative contract documents both stacks cite. Landed by their named plan tasks:
| doc | contract | plan |
|---|---|---|
00-wob-format.md |
.wob bytecode format (compiler↔VM) |
1 |
01-error-catalog.md |
every WO-E### code |
2, grows 3/8 |
02-corpus.md |
how to add conformance fixtures | 3 |
03-shard-actor.md |
shard ownership, mailboxes, send-as-move | 4 |
04-db-binding.md |
row format, WAL records, query subset | 5 |
05-http-service.md |
route section, trap→HTTP table, JSON subset | 6 |
06-ui-live.md |
delta frames, subscribe protocol, wo:live | 7 |
07-systems-stdlib.md |
per-function nil-vs-trap contracts | 9 |
08-builtin-surface.md |
builtin source names, container/call/entry rules the emitter enforces | 3 |
Specs and plans: docs/superpowers/{specs,plans}/. Repo map: docs/08-project-structure.md.