Every surviving carrier now owns its artifacts: checked mkdir/mkdtemp/
fopen acquisition, one all-exit cleanup funnel per carrier, ENOENT-
tolerant checked unlinks, exact-path deletion (rm -rf only for an
owned pid-keyed dir or a .sepwork beneath one), and cleanup failure
fails a passing carrier without overwriting its diagnostic. In the
same pass the carriers adapt to the driver contract this branch lands:
--sep and WW_PKGCACHE are gone, -S and the /tmp/ww_run_<pid> scratch
contract are asserted, and rows whose runtime or reject coverage moved
to test/wcc/data fixtures or test/lang @test owners are trimmed to the
byte/artifact/diagnostic observations only they can make.
Repair and adaptation ride together because most files interleave both
in the same hunks; splitting would manufacture intermediate carrier
states that never existed and cannot run against either driver.
wwstage cgen resolved struct LAYOUT by bare-leaf name (structlookup /
structparamsize) at three caller-side sites — the by-value arg push
(cgenutil), the let-receive copy width (cgenstmt), and the field-read
offset (cgenexpr). Under a cross-module same-leaf collision (two modules
each exporting a `pair`, 16B vs 24B) the name lookup first-matches the
WRONG type, so the push dropped the 2nd eightbyte, the receive over-copied,
and the field read the wrong offset. cstage type-keys off the stamped
tinfo and is correct; this aligns wwstage UP to it (ww-only change).
Route all three sites through the stamped node.type_ via a new
structabisizetn(*tinfo) accessor (push + receive) and tichase(type_).fields
(field-read, structlookupchain removed). One commit (rule-11 carve-out):
the collision drives all three at once and no per-site fixture isolates, so
it cannot bisect-split. A scoped slice of the #209/#211 name-keyed-cgen
cluster retirement; the cgdot *struct-ptr/global and let-copy siblings stay
name-keyed and are filed (#31).
New table-driven test 793_xmod_struct_argpush_collide_run (4 scenarios:
push/recv/field over 16B and 12B tails) reddens under a revert of the three
cgen files. Full make test green (336 passed); make sizelint clean.
