wwstage's taggedvariantindex returned -1 (caller maps to 0) for
N_IDENT returns of an aliased mixed-variant union. Cstage returned
the correct variant index. Cross-stage divergence — root cause of
worker-fmtparser's "reads bool-true as false" symptom in the #18
repro chain. Worker-18 dodged it by dropping 707's asm byte-id
loop; #20 re-enables it.
Unwrap at entry: resolvetagged peels N_TNAME alias chains down to
the underlying N_TTAGGED before the variant-index walk. Direct-
tagged callers are unchanged (resolvetype is a no-op on non-N_TNAME).
Mirrors nodeisstr's shape — same class of wwstage-no-typed-AST gap
tracked by #11.
Test 707 grows from 6 → 9 rows; new rows pin tag=0/1/2 (i64/str/
bool) explicitly so a future variant-reorder can't hide behind a
coincidentally-correct tag=0. Asm byte-identity loop re-enabled
(disabled by #18); now exercises both #18 (ABI words) and #20
(variant-index) fixes — rows 2/3/6 also probe str/bool divergence.
995_self_rebuild green confirms wwstage source itself has no
latent aliased-tagged-return that would have surfaced as a self-
divergence.
Hojun-Cho
09ce249226