# Session summary — 2026-10-01 (d): wrapper/time library + showcase22

Suite **177/177**; self-hosting fixpoint **OK** (image
**2,899,706 bytes**).  Tag `v3-wrap-modules`.

This step added the gm2/ISO channel-and-time wrapper modules that the
current dialect can express, plus a showcase touring them alongside the
session's earlier work.

## Steps, tags and headline commits

| Step | Tag | Commit | What |
| --- | --- | --- | --- |
| wrappers | `v3-wrap-modules` | `05d9bd0` | StdChans, TimeString, wrapclock, wraptime, wrapc |
| Showcase + docs | `v3-wrap-modules` | (this commit) | showcase22, this summary |

(The same tag covers both, since the showcase is documentation of the
step.)

## 1. Modules added

| Module | What |
| --- | --- |
| `StdChans` | settable current channels (`InChan`/`OutChan`/`ErrChan` + setters) over `IOChan`; `NullChan` is a closed channel |
| `TimeString` | `GetTimeString` — local time as `strftime("%c")` |
| `wrapclock` | opaque `timespec`; `timezone`/`istimezone`/`daylight`/`isdst`/`tzname`; `InitTimespec`/`KillTimespec`, get/set fields, `GetTimeRealtime`/`SetTimeRealtime` |
| `wraptime` | opaque `timeval`/`timezone`/`tm`; `gettimeofday`/`settimeofday`, `GetFractions`, `LocalTime`, field accessors, `SetTimeval`/`SetTimezone` |
| `wrapc` | `getrand`, `signbit`/`isfinite`/`isnan` (f/l variants), `SeekSet`/`SeekEnd`, `ReadOnly`/`WriteOnly`, `filesize`/`fileinode`/`filemtime`, `getusername`, `getnameuidgid`, `strtime` |

The shim gains `m2timestring` and underscore-free `m2wc*`/`m2wt*`/
`m2c*` helpers (classic Modula-2 identifiers have no `_`, so the
helper names avoid it while the Modula-2-facing names match gm2).

## 2. Deliberate deviations

- `wrapc.ReadOnly`/`WriteOnly` return **`CARDINAL`**, not `BITSET`:
  `BITSET` is not accepted as a **function-result type** in V3 (nor is
  `VAL(BITSET, n)`).
- `wraptime.localtime_r` is spelled **`LocalTime`** — the `_` is illegal
  in a classic identifier.

## 3. Not included

`ChanConsts` and `StreamFile` are written but **not committed**: their
`read = FlagSet{readFlag}` constants need **typed set constructors**
(`T{lit}`), which the frontend reports as `not supported yet`
(untyped literals with an inferred base, `b := {r, w}`, do work).  Both
files remain on disk for the next step, which is a frontend change.

`GenDevIF` and `DeviceTablePtr` are **not real gaps**: they are not
present in the installed gm2 library set.

## 4. Showcase

`compiler/tests/showcase22.mod` (`Showcase22`, exit 42) tours:

- **forward module-level variables** — `Bump` uses `total`/`done`
  before their `VAR` declaration;
- **expression result suffixes** — `GetRec()^.a`, `GetArr()^[i]`;
- **the wrapper library** — `StdChans.OutChan`, a `wrapclock` timespec
  roundtrip, a `wraptime` timeval+`LocalTime`, `wrapc.getrand` range and
  `signbit`/`isfinite`, and `TimeString`.

```
showcase22 total=42
```

## Tests (177, was 176)

New: `wrapprog.mod` (the five modules, exit 42) and `Showcase22`.

## Resume

```sh
cd .../m2compiler-V3
./bootstrap/fixpoint.sh                       # FIXPOINT OK
cd compiler && ./build.sh && ./run_tests.sh   # 177/177
```

## Remaining

`ChanConsts` + `StreamFile` (typed set constructors); `GOTO`/labels;
generics; statement-context result suffixes; multiple inheritance
(deliberate).