Reject helpers checked only rc!=0, so a SEGFAULT (exit 139, or the
driver's "w6c failed" exit 1) counted as a clean reject -- a wwstage
crash could pass vacuously (it did, latently, on bodied bare-... pre
#11). Every reject row now captures stderr and requires the actual
diagnostic substring (rc!=0 AND strstr) across all 16 reject tests; a
crash emits no diagnostic, so it now fails. This is the
differential-reject backstop (#15): both stages must cleanly reject
with the expected message.
Two genuine cstage/wwstage diagnostic-body divergences are documented
inline via per-stage substrings, not papered over (845 tuple parse,
catA_f2 tuple arity); catalogued in #21.
exprtype N_MATCH took the first arm's yield type without walking the
rest — int-vs-str arms silently produced garbage downstream. Walk all
arms: typeeq-equal accepts; a definite coarse-family mismatch
(num/str/bool via the new yieldclass classifier, unknown classes stay
lenient) rejects. Same-family non-assignable pairs remain lenient —
the documented precision residual is task #52 (needs tinfo-level
type_assignable). The wave's table-driven reject test lands here:
989_catA_f2_reject, 19 rows x 2 stages, each member pre-fix-red-proven.
