# Session summary — 2026-09-29 (c): CLASS finished + showcase19

Suite **147/147**; self-hosting fixpoint **OK**
(image **2,313,762 bytes**). `master`, tree clean except the user's
uncommitted `compiler/toto.mod`.

This session closed out the Clarion `CLASS` feature, then showcased
it.

## Steps, tags and headline commits

| Step | Tag | Commit | What |
| --- | --- | --- | --- |
| CLASS finished | `v3-class-finish` | `3804256` | sibling method calls + init body |
| Showcase | `v3-showcase19` | (this commit) | init body + sibling-call chains |

## 1. CLASS finished

Two `230`s removed (the third, multiple parents, stays by design):

- **Sibling-method calls** — inside a `CLASS IMPLEMENTATION`, a bare
  method name is a call on `THIS`.  `SymTab` tracks the innermost open
  implementation (`implStk`/`CurImplClass`); `Design` binds an
  otherwise-unresolved name to the class's method and arms `THIS` as
  the receiver.  A virtual sibling still dispatches through the
  vtable.
- **Class `BEGIN … END` init body** — emitted as `<Class>_init`,
  registered with the module init functions, and run **once at
  startup**.  (A body touching instance fields still reports 230:
  there is no receiver, and V3 has no class statics.)

`docs/summary_class-finish.md`.

With this, `CLASS` is ✅ for: fields, methods (value/`VAR` formals,
results), single inheritance, `WITH`, hidden `THIS`, `VIRTUAL`
dynamic dispatch (vtables) with subtype pointers, sibling calls, and
init bodies.  ⏸ multiple parents only.

## 2. Showcase

`compiler/tests/showcase19.mod` (`Showcase19`, exit 42):

- `Accumulator`'s `BEGIN` body sets a global `scale := 10` at startup.
- `AddPair` → `AddScaled` → `Add` is a **chain of sibling calls** on
  `THIS`; `AddScaled` uses the init-set global.
- The result is rendered with `Conversions.IntToStr` + CHAR-array `+`.

```
showcase19 total=42
```

## Tests (147, was 146)

New: `Showcase19` (42).  (The class-finish step added
`t_classsibling` and `t_classinit` and promoted `t_class`.)

## Resume

```sh
cd .../m2compiler-V3
./bootstrap/fixpoint.sh                       # FIXPOINT OK
cd compiler && ./build.sh && ./run_tests.sh   # 147/147
```

## Remaining polish

- Multiple parents (deliberate).
- `VAL(LONGINT|REAL, x)` and long→int narrowing.
- More stdlib (`SysClock`, richer `Strings`/`Math`).