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.
Mirrors cstage check.c:1491-1495 (type_isint via the syntax.typeisint tinfo chaser, which chases TY_NAMED.under/TY_ENUM.sub — not the AST-keyed isinttypeast that would falsely reject an alias-int index). Record-and-continue, before the base-bail. Reject path emits no asm so cstage==wwstage byte-id holds (453 green). Pre-existing index double-emit deferred (#6).
