New lib/io/types.ww mirrors ref/hare/io/types.ha — the surrounding
port that lives alongside the existing lib/io/io.ww (pre-vtable
stream + eof + underread). Hare splits the same way (stream.ha +
types.ha share `module io`); ww does the equivalent via dir-enum.
Each type cites Hare per CLAUDE.md rule 9:
- mode (enum u8) — ref/hare/io/types.ha:29-34. RDWR=3 (not
Hare's `READ | WRITE`) because ww enum-value
positions don't fold expressions; bitfield
value SSoT preserved, divergence inline.
- whence (enum i32) — ref/hare/io/types.ha:37-41. Hare leaves the
underlying implicit; ww requires one. i32
matches the `off` type fold-e wires in.
- error — ref/hare/io/types.ha:11. Hare spreads
`errors::error`; lib/errors not ported, so
the union carries the two tags observable
in this fold: underread (from io.ww) and
the predeclared `nomem` (#29, type.c:72 /
check.ww:78). NOT redefined here.
- reader/writer/closer — ref/hare/io/types.ha:46/51/55. EOF=eof
(not Hare's `done` singleton) per #93
and the io.ww:8 rationale. `*stream`
forward-refs the existing pre-vtable
struct in io.ww; same cross-file pattern
Hare uses.
Drew signoff (this fold only): seeker, copier, strerror, and the
EOF=done singleton DEFERRED to fold-e — they need the `handle` sum
and #93's done landing. Hare's `_unsafe` carve-out unaffected.
eof / underread / stream re-used from io.ww (NOT redefined); io.ww
keeps the pre-vtable struct unchanged, ditto its WHY-comments.
Combined.ww regen (#110): selfhost/cmd/{w6c,wwdump}/main.combined.ww
auto-pulled the new types.ww via dir-enum (+52 lines each, same
package io). Makefile dep lines for wwdump_ww + w6c_ww add the new
source so editing it triggers rebuild.
Probe: test/wcc/768_io_types_run.c — 5 rows × 2 stages = 10
invocations. Pins enum value/underlying + the three fn-type aliases
at the param slot. Both siblings filed inline in the probe header:
- #189 wwstage `let r: io.reader = fn_name;` bails "let: not
assignable". cstage accepts. Param + struct-field paths work
in both stages, so io vtable port is unblocked. Probe uses
the alias only at the param slot.
- #190 wwstage match-arm on cross-module variant tag bails
"case: not a variant of scrutinee (io.eof | io.error)". Likely
same family as #178. cstage accepts. Probe uses `is` instead
of `match` for the variant gate.
make test: 201/201 (was 200; +1 from 768). 990-997 byte-id +
combined_ww_fresh + sizelint all green.
Hojun-Cho
635429bef8