Decomposes intrinsic-bodies.1 (parent spec docs/specs/0055-intrinsic-bodies.md
§ Architecture points 1-5) into 8 tasks plus a final gate:
Task 1 — Term::Intrinsic unit variant in ast.rs + the in-core
exhaustive-match arms (canonical/hash/visit/pretty), enumerated by
cargo build -p ailang-core (no-wildcard matches break until armed).
Task 2 — surface parse + print: (intrinsic) as a fn body-slot clause
and a lambda positional body, mapped to/from Term::Intrinsic;
round-trip rides the examples/ corpus gate.
Task 3 — cross-crate walker sweep (check + codegen + prose): leaf
arms at the sites that match Term::New today, enumerated by
cargo build --workspace. The two MEANINGFUL arms (codegen lower_term,
checker body-check) are bridged with a temp unreachable! so the gate
is green, then replaced by Tasks 4-5 — no deferred-caller across a
0-error gate.
Task 4 — checker: env.current_module_kernel_tier flag, signature-only
body check for an intrinsic body, intrinsic-outside-kernel-tier
reject (CheckError variant + code() arm). Reject test is subprocess
`ail check --json` on a temp file, modelled exactly on the verified
check_json_unbound_var pattern.
Task 5 — codegen: a Term::Intrinsic body routes through
intercepts::lookup; never reaches lower_term; lower_term's
Term::Intrinsic arm is a codegen-internal error.
Task 6 — `answer` intercept (ret i64 42) + the answer intrinsic in
STUB_AIL + examples/kernel_intrinsic_smoke.ail so the
schema_coverage corpus observes Term::Intrinsic (avoids the
Term::New-in-match-but-not-in-corpus gap).
Task 7 — E2E ratifier examples/kernel_answer.ail (calls
kernel_stub.answer, prints 42); build_and_run("kernel_answer.ail")
asserts stdout 42.
Task 8 — design/contracts/0002-data-model.md gains the
{ "t": "intrinsic" } Term entry; design_schema_drift mirror stays
green.
Three plan-time corrections after plan-recon + harness verification:
1. The reject test was first drafted against an invented ailang_check
API (Workspace::single_with_prelude / check_workspace). Verified
against e2e.rs:1236 that the established reject pattern is
subprocess `ail check --json` + exit-1 + JSON code assertion;
rewrote on a temp file.
2. build_and_run takes the fixture filename WITH .ail extension
(verified e2e.rs:13-38, existing calls build_and_run("sum.ail")) —
the ratifier call is build_and_run("kernel_answer.ail").
3. kernel_intrinsic_smoke.ail carries an intrinsic with no registered
intercept; confirmed no gate builds it (compile_check.py uses a
curated list, no test builds all examples/*.ail) — it rides only
the parse-level round-trip + schema-coverage gates, never a build.
Scope guard: .1 does NOT migrate prelude dummies, does NOT upgrade the
registry pin to a bijection, does NOT remove the dead body-lowering
path — all .2. Hashes stay stable in .1 (Term::Intrinsic is additive;
no existing fixture carries it).
Test trajectory: 667 (post-raw-buf.1) → ~669 (+intrinsic_in_user_module_is_rejected,
+answer_intrinsic_builds_and_runs_printing_42; corpus/round-trip
fixtures ride existing dynamic gates).
Handoff target: skills/implement on docs/plans/0106-intrinsic-bodies.1-mechanism.md
Brummel
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