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".
Wwstage's cglet skipped MOVQ $0 for sz=8 slots that cstage
zero-inits unconditionally — !void error types (utf8.invalid)
and void-alias variant tags (utf8.done / utf8.more) drifted
byte-id post-utf8 + lib/strings; promotes STATUS-3 #22 from
latent to bootstrap-blocking. Cstage emits MOVQ $0, -K(BP) in
the prologue for any sz=8 let-decl slot via the natural
type-fallthrough; wwstage's `typeis8byteprimitive` helper
returned false on N_TBANG and on N_TNAME pointing to an alias
that resolves to void, so the gate never fired and the slot
stayed uninitialised.
Polarity catalog: wwstage UNDER — `typeis8byteprimitive`
classifier too narrow at N_TBANG and void-alias N_TNAME.
Convergence wwstage → cstage's natural sz=8 fallthrough (rule
10). N_TBANG arm recurses on inner type (cmd/wcc/check.c:290
resolve_type copies T's kind, only sets iserror — so !T is
8B iff T is 8B); void-alias N_TNAME resolves through alias-
recursion the same way.
Tests:
- 724_letdecl_zeroinit pins MOVQ $0, -K(BP) presence between
function prologue and body on canonical !void and void-
alias rows, plus cmp -s byte-id between stages per row.
Filed follow-up (NOT in scope here): #25 wwstage 8B struct
without rhs still under-emits (structlookup != nil short-
circuits the classifier). Same family as STATUS-4 #36 primsize
composite-aware sizing. No in-tree consumer.
96/96 ok. 995_self_rebuild stays green (ww2==ww3==ww4 byte-id).
