With 0115's own-wins globals landed, the remaining tail modules join
std.sx: every '#import "modules/std.sx"' now carries mem/xml/log/fs/
process/socket/json/cli/hash/test as namespaces (trace stays a direct
import).
Enablers in the same change:
- emit: dead-global elimination — a plain-data global no instruction
references is not emitted, so tail modules' data (hash's 64-entry K
table, OS/ARCH/POINTER_SIZE) stays out of binaries that don't use it.
Comptime-backed globals keep their #run evaluation. 37 pinned IR
snapshots regenerated (dead globals dropped + string renumbering from
the larger module).
- 1055/1056 stop pinning the global error-tag ordinal (it shifts with
program composition); they assert nonzero + tag identity + name.
- specs/readme/CLAUDE.md tail docs updated.
Attempt-1 narrowed lowerReturn's target to failableSuccessType(ret_ty) for
every value-carrying failable. That fixed the bare-enum success slot but
introduced two defects (attempt-2 review):
F1 — explicit full failable tuple `return (.v, error.X)` panicked. With the
target narrowed to the value type, the trailing error element no longer
resolved against the error set, leaving an `.unresolved` tuple field that
tripped "unresolved type reached LLVM emission" in backend/llvm/types.zig.
F2 — a `-> (Enum, !E)` body with a comptime parameter is inlined
(lowerComptimeCall), so its success `return .red` took the inline-return path,
which the first cut skipped: it stored `{value, undef}` (error slot undef) into
the inline slot, so the success error slot read garbage at runtime.
Fix: choose the return-expr target via failableReturnTarget(ret_ty, value_node)
— a BARE value resolves against failableSuccessType (real enum ordinal), while
an EXPLICIT full failable tuple literal (arity == full-tuple field count) keeps
the full-tuple target and is forwarded as-is. This applies on the inline path
too, and the inline value-failable return now routes through
lowerFailableSuccessReturn (whose emitTupleRet stores `{value, 0}` into the
inline slot + branches), so the success error slot is 0 there as well.
Regression: examples/1056-errors-enum-value-failable-tuple-and-comptime.sx —
F1 explicit-tuple error return + bare-value success in one fn (no panic, slot 0
on success, tag 1 on error); F2 comptime-param enum value-failable read at
runtime on the success path (cast, bare if, == error.X) + error path. Reads the
slot at runtime so an undef is caught, not masked by the `if !e` proof.
examples/1055 + the original 0097 repro still pass. Gate: zig build 0,
zig build test 0, run_examples.sh 453 ok / 0 failed / 0 timed out.
