Flip the soft-default to a hard "missing package clause" error symmetrically in
both stages (cmd/wcc/parse.c + lib/ww/syntax/parse.ww): the first real decl of a
primary section with empty pathmod/resetmod and no seen clause is now rejected.
Closes the documented soft-default divergence (the 63-wrapper carve-out).
The gate flip can't be split from the migration it breaks, so this is one atomic
commit: ~80 test/wcc wrappers gain `package main;` via a shared wwtestpkg.h
helper, 6 data fixtures plus 17 asm-grep assertions update for the bare->main.<leaf>
root-helper mangle shift, and rt/ declares `package rt;` with @symbol pinning the
bare rt_ensure/rt_malloc linker names.
Root mangling narrows: the executable entry `main` stays bare (existing
carve-out), but root helper symbols become main.X. The #84 cluster is rewritten
to assert main.run distinct from aa.run/test.run; its cgen fix and bare machinery
are retained — still load-bearing for package-less module-reset deps. New
table-driven test 782_strict_package.c (6 rows, both stages).
Retiring //ww:module-reset is deferred to #24b: it is load-bearing (clears the
.wwi pathmod so the body's package clause asserts), not a vestige; fusing its
removal here would be a silent mismatch.
All byte-id gates green; full make test reports "all 335 tests passed".
Class A wwstage cgen miscompile, silent until wwstage path engaged.
Pre-fix wwstage's name-keyed flatvariantidx returned -1 for `[]T`
variants (pat.str empty on N_TSLICE), so cgmatch and
cgtagvariantidx collapsed every `(scalar | []T)` arm to tag 0.
Internally consistent within wwstage; cstage's structural
`type_eq` (cmd/w6c/cgen.c:466 cg_tag_for_variant) matched
correctly. Bootstrap stayed green because no selfhost-corpus path
exercises `(scalar | []T)` until lib/bytes / lib/strings landing
pulls bytes.index through wwstage compilation — 967_bytes_run
uses `ww run` (cstage only), so the wwstage path was never
exercised.
Polarity catalog entry: wwstage UNDER (missing N_TSLICE dispatch
arm in variantindex lookup), not REVERSE — worker's deeper read
corrected rob's initial diagnosis. cstage's structural type-eq is
the leaner-correct side; wwstage converges to it per rule 10.
Fix: new `flatslicevariantidx` helper in cgenutil.ww keyed on
N_TSLICE shape walking pat.lhs against vt.lhs alongside the existing
name-keyed flatvariantidx; extend `taggedvariantindex` shape-fallback
with a `wantslice == ivisslice` axis alongside the existing str
axis; route N_TSLICE in cgenexpr.ww's cgtagvariantidx (is/as)
and cgmatch (case) through the helper. No edits to cgenmatch's
dispatch codegen (CMPQ/JNE/spill) — that's symptom, the bug is
in the variantindex lookup.
Surfaced the 7th corpus-coverage-blind unmask of session 5 (sister
shape to STATUS-4 #11 / #14 / #21 wwstage UNDER family). Latent
within lib/bytes (a6abac2) since landing today; 967_bytes_run's
cstage-only `ww run` driver kept it dormant.
Tests:
- 722_match_slice_variant pins cmp -s byte-id between stages
for the canonical (u8|[]u8), reverse-order ([]u8|u8), and
three-arm (u8|[]u8|str) shapes.
- 926_match_slice_variant_run runtime-pins 7 rows × 2 stages
(cstage + wwstage drivers): canonical, reverse-order, and
other scalar-vs-slice-of-same-primitive matrices (i8|[]i8,
i32|[]i32, u64|[]u64, rune|[]rune), three-arm with str.
Verifies both arms reachable and payload survives.
Filed follow-ups (latent, NOT in this commit's scope):
- flatslicevariantidx falls back to first slice slot when no
element-name matches; `([]u8 | []i32)` would mis-route. No
in-tree consumer.
- 926 missing nested ((u8|[]u8) | i32) row per rob's spec.
- 3-arm 32B tagged sequential-push payload corruption (both
stages, asm byte-id passes, only 9xx runtime catches).
- Chained inline pick() over 32B 3-arm slot (both stages,
bind-to-let workaround documented at 926 row).
93/93 ok. 995_self_rebuild stays green (ww2==ww3==ww4 byte-id).
