Drew T
2.3 KiB
§94 — A family sweep's 0/N is a TYPE-CARRY failure until proven otherwise: lift the exemplar's local types, ALL of them, transitively (Phase 29 SESSION-21, func_8016B6BC 0/137 → 137/137)
func_8016B6BC failed its family sweep at 0/137, reproducibly, twice — once in the 274-member
propagation batch and again after the §91 --like guard landed. It looked exactly like the §86
bimodal case ("some families template, some do not"). It was nothing of the kind.
§59(1) says a remap drops the exemplar's LOCAL struct types. It does — and the failure it produces names the wrong thing. cc1 reports:
`c' undeclared (first use this function)
`v' undeclared (first use this function)
`off' undeclared (first use this function)
Those are ordinary locals and they ARE declared in the remapped body. cc1 says "undeclared" because
it aborted the declaration block at an unknown TYPE (Prim_8016B6BC prim;) and every later
declaration in that block fell out with it. Read the first error, not the loudest one — and if a
variable you can see declared is reported undeclared, suspect its type, not its declaration.
The lift must be TRANSITIVE, and one round is not enough. Lifting the type the body names
directly (M8_8016B6BC) changed nothing: still 0/137. The full set was four, discovered by
following each definition's own references —
M8_8016B6BC → Prim_8016B6BC → Vtx_8016B6BC (named only inside Prim's body) → DVec_8016B6BC.
tools/lift_types.py --types A,B,C --apply lifts them to engine_types.h and strips the local
copies. Byte-gate the lift ALONE first (it must be neutral — it was, d19c9580… unchanged), then sweep.
Result: 0/137 → 137/137, zero failures. R22 clean-fleet 140/140.
The law: a sweep
0/Nis an INTEGRATION signal (§59), and the cheapest hypothesis is that the exemplar's body references a type only its own TU defines. Diagnose by splicing ONE sibling and reading cc1 directly (§93) — the sweep's own summary tells you nothing about cause. Then lift the transitive closure of the local types, not just the one the body mentions.Cost of not doing this: this family sat recorded as a bimodal "doesn't template" case across two sessions. The whole diagnosis, once pointed at one sibling's real stderr, took under an hour and was worth 137 members.