Brummel
d1612d5463
Decomposes raw-buf.1 (parent spec docs/specs/0054-raw-buf.md
§ Architecture point 1, § Components row 1) into 5 tasks:
Task 1 — intercepts module skeleton (3 steps)
Task 2 — populate the table: 18 emit fns + visibility bumps (9 steps)
Task 3 — rewire the dispatch site to a thin shim (3 steps)
Task 4 — fold wants_alwaysinline into the registry (4 steps)
Task 5 — registry_contains_all_legacy_arms pin test (3 steps)
Three substantive decisions made at plan time beyond what the spec
dictates, surfaced by the plan-recon report:
1. The match arm count is 18, not the ~8 the spec sentence hand-listed
(eq__Str, compare__Int|Bool|Str, float_*). Five additional arms
(eq__Int, eq__Bool, eq__Unit, plus the lt|le|gt|ge|ne__Int
direct-icmp family) shipped after the spec sentence was written.
All 18 are absorbed by the registry; the pin test enumerates all 18.
2. The `intercept_emit_wants_alwaysinline` predicate at lib.rs:1172 is
a separate hardcoded name-list that mirrors the dispatch arms.
This is a silent-drift class (regression seen earlier in the cycle
on compare__Int perf at +29-47% when the lists diverged). The plan
folds wants_alwaysinline into the Intercept entry as a per-row bool
and rewrites the predicate to consult the registry — one source of
truth instead of two.
3. The wrapper fn `try_emit_primitive_instance_body` survives as a
thin shim (`match intercepts::lookup(name) { Some(i) => ..., None
=> Ok(false) }`) rather than being deleted. Trade-off: a 6-line
wrapper vs. a 14-file comment-ref churn. The wrapper wins —
landmark name preserved, all in-source doc comments stay valid.
Plan honours the project's compile-gate discipline: fn signatures
stay stable throughout (only bodies change), no caller-threading is
deferred across a build gate. Visibility bumps in Task 2
(pub(crate) on three Emitter fields and four helper methods) are
additive and do not change any caller's signature.
Verification commands in each Run step name actual test fns the
plan-recon confirmed exist at specific lines; no filter-zero-match
risk. Pre-flight workspace baseline: 668 tests; post-iter:
669 (the new pin).
Handoff target: skills/implement on docs/plans/0104-raw-buf.1-intercept-registry.md