d72fe0c2e61e44026f506e6bc9a8f1ad9a68ce8d
8 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 Brummel
|
d72fe0c2e6 |
fix(codegen): drop branch-consume-split owned params (#63 leg 3)
The last leg of the #63 drop-soundness cluster: an (own ...) heap param consumed on one match-arm / if-branch but live on a sibling was never dropped on the live path, leaking one slab per call. This was the residual live=2 leak in series_sma that kept the series headline from being leak-clean. Root: the per-fn aggregate consume_count (the worst-case max over all branches from uniqueness::merge_states) was codegen's only consume signal, and every owned-param drop site gated on it. A param consumed on SOME branch makes the aggregate >= 1, so every site skipped it — including the branch where it stays live. match and if share this root (if is first-class MTerm::If, not desugared to match). Mechanism (spec 0068): - CAPTURE: uniqueness retains the per-branch consume snapshots it already computes per branch and discarded at the max merge — new BranchConsume + infer_module_with_cross_branches (the aggregate-only infer_module_with_cross now delegates and drops the channel). - CARRY: additive MArm.consume / MTerm::If.{then,else}_consume, attached by lower_to_mir via a traversal-order cursor (post-order pop, kind- and exhaustion-asserts make a desync a loud panic; neutral for const bodies which uniqueness does not walk). The AST carries no node id, so the correspondence is the structural pre-order both walks share — pinned by branch_consume_maps_attach_to_matching_arms. - GATE: emit_leakclass_branch_param_drops fires a fall-through drop only for the leak class (branch_consume==0 AND aggregate>=1), in match arms + both if branches; the pre-tail-call dec switches its gate source from the aggregate to per-arm. The fn-return dec and arm-close pattern-binder dec are UNCHANGED. Safety: - Double-free: the drop sites partition by aggregate (==0 -> existing fn-return/pre-tail-call; >=1 -> new per-branch). Disjoint, so no param is dropped twice — no fn-return disable, no tail-position analysis. - Use-after-free: the checker rejects use-after-consume, so an aggregate>=1 param is provably dead past the construct (path-terminal drop, tail position irrelevant). - Type eligibility (found by the full-suite gate during implement; spec 0068 refined): the new agg>=1 site is the FIRST drop site that can reach a STATIC closure-pair param (a top-level fn ref like inc in Either.either, consumed on one arm, live on the other) — a .rodata constant with no rc-header. field_drop_call routes Type::Fn / static-Str / Type::Var to the bare ailang_rc_dec, which underflowed on it. The helper now drops only params with a real per-type heap-ADT drop fn (field_drop_call != "ailang_rc_dec"). Sound (no underflow) and leak-correct (a static closure/Str allocates nothing). Witnessed green by std_either_demo / std_list_demo / poly_rec_capture_demo. Verification: full workspace suite green (116 binaries); both new leak pins (if + match) and series_sma_no_leak_pin green at live=0; legs 1/2 pins still green; INTERCEPTS<->(intrinsic) bijection intact; no Pattern::Lit reject path added. The leg-3 helper's type precondition was applied inline by the orchestrator (a narrowing guard clause in an already-reviewed Task-4 helper, full context loaded) after the implement-orchestrator correctly surfaced the spec gap rather than papering over the regression. This clears the series_sma leak tail; the series milestone (#61) close stays a separate deliberate step (its end-to-end milestone fieldtest). closes #63 |
||
|
Brummel
|
7ae92d3e60 |
refactor(test): hoist duplicated test helpers into ailang-test-support
closes #60 The fixture-corpus filter (NON_PARSEABLE_FIXTURES + list_ail_fixtures) was copy-pasted across three test crates and drifted out of sync as new reject fixtures landed; the examples_dir / workspace_root path walk was reimplemented ~30 more times across the suite, under two spellings (workspace_root / ws_root). Introduce crates/ailang-test-support — a zero-dependency, dev-only leaf crate — as the single home for these helpers: - NON_PARSEABLE_FIXTURES, list_ail_fixtures - workspace_root, examples_dir - canonical_workspace_root (symlink-resolved variant, for the tsan/ race tests that feed the root into native build steps) All integration-test copies across ailang-core, ailang-surface, ailang-prose, ailang-check, and ail now import from the shared crate; the local definitions and their now-orphaned path imports are removed. Path helpers resolve via the support crate's own CARGO_MANIFEST_DIR, so they return the correct absolute paths from any caller. ail_bin helpers are intentionally left in place: they depend on env!("CARGO_BIN_EXE_ail"), which Cargo only defines when compiling the ail crate's own integration tests, so they cannot move to a shared crate. Behaviour-identical: same paths, same fixture lists; full workspace test suite green. Net -177 LOC. |
||
|
Brummel
|
c5fd16a4eb |
feat(codegen): StrRep loop-carried Str ⇒ Heap, close the #49 recur leak
mir.4 closes bug #49 (a heap-Str loop binder replaced across `recur`
leaks every superseded slab; the loop result leaks too) structurally,
by making every Str a loop binder holds OR a loop returns an owned heap
slab — then deleting the `!is_str` carve-out from BOTH codegen gates
that carried it. The leg-by-leg `!is_str` patches are gone.
Mechanism (the milestone thesis: representation in MIR, codegen reads
it). lower_to_mir sets rep = StrRep::Heap on every Str literal in a
loop-carried position; codegen's MTerm::Str arm promotes a Heap literal
via ailang_str_clone (a fresh ailang_rc_alloc slab, rc_header refcount
1). Three promotion positions, all in the Loop/Recur lowering:
1. binder seed inits (is_str_ty on the binder type);
2. recur args at Str-binder positions (read off the innermost
loop_stack frame);
3. exit-arm tail result literals (promote_tail_str_literals walks the
loop body's tail positions when the loop returns Str).
With every loop-carried Str now owned-heap, both gates lose !is_str:
the recur superseded-value dec (lib.rs) frees each intermediate slab;
the loop-result trackability gate (drop.rs:493) lets the caller's
scope-close free the final slab.
Why both gates, and the planning-time error this corrects. The original
plan/spec scoped the deletion to the recur dec gate only, reasoning the
#49 loop result is "consumed by print". The implement-orchestrator
landed that scope (Tasks 1-2) clean and correctly BLOCKED: it took #49
from live=3 to live=1, the residual being the loop RESULT. I verified
the diagnosis empirically:
- print BORROWS its arg (prelude: `(let s (show x) (do io/print_str
s))`, the eob.1 heap-Str discipline), so `(print s)` does not free
the loop result; the caller's let-binder does, via drop.rs:493.
"consumed by print" != "freed by print" — that was the error.
- Deleting drop.rs:493's !is_str takes #49 and the recur-literal
fixture to live=0.
- Deleting drop.rs:493 WITHOUT exit-arm promotion SIGSEGVs (exit 139)
on a loop returning a static Str literal — hence the third
promotion position and the static-exit witness.
The agent surfaced a real spec defect via an empirical BLOCK rather
than guessing; I corrected the spec refinement note (both gates, three
positions) and completed the loop-result leg inline, the context
already loaded from verifying the BLOCK (CLAUDE.md "already loaded
context" carve-out). drop.rs:493's Str carve-out is now sound to delete.
Boundary (asserted ill-typed, not constructible): a borrowed static-Str
Var seeded/recur'd into a consumed Str loop binder — rejected upstream
by uniqueness (a consumed binder position is owned).
Verification (orchestrator-run): all four leak fixtures reach live=0
under AILANG_RC_STATS — #49 (xyyy), recur-literal (reset), static-exit
(result), and the
|
||
|
Brummel
|
eba1be8d9d |
feat(codegen): fill MArg.mode for App args, read the anon-temp drop gate off it, delete module_def_ail_types (mir.3b)
Second of two iterations delivering spec 0060's mir.3 row (plan docs/plans/0118-mir.3b-marg-mode-and-table-delete.md). lower_to_mir's Term::App arm fills each MArg.mode from the resolved callee's param_modes (the sig = synth_pure(callee) it already holds); codegen's emit_call anon-temp borrow-slot drop gate reads arg.mode instead of re-looking-up the callee's param_modes from the module_def_ail_types table; and — since that gate was the table's only reader — the module_def_ail_types field plus all its construction and threading are deleted. Two refinements to the spec's mir.3b sketch, settled in planning from a focused recon and recorded in spec 0060: 1. module_def_ail_types is deleted in mir.3b, not mir.5. A grep proved self.module_def_ail_types had exactly ONE reader (the anon-temp gate); the own-param drop reads param_modes from the def's own f.ty, not this table. Once the gate moves onto MArg.mode the table is dead, so it is removed now rather than carried as dead code to mir.5. The mir.5 row's "last re-derivation residue" shrinks to the element-type / Term::New (New.elem) work. 2. MArg.mode is filled for App args only; MTerm::Let.mode is not filled. Only App args have a real per-arg mode source (the callee Type::Fn.param_modes). Do args (EffectOpSig has no param modes), Ctor args (no per-field mode), and Recur args (loop binders carry no mode) stay Mode::Owned. Let.mode has no source (ast::Term::Let has no mode field) and no consumer (the let-drop gate reads consume, not Let.mode), so it stays Owned — filling it would invent a value nobody reads. Safety property held: MArg.mode is filled from the same callee fn-type the gate read from the table, so the drop fires identically. For (app RawBuf.get (app RawBuf.set …) 0), RawBuf.get's param 0 is borrow, so args[0].mode = Borrow — exactly the value module_def_ail_types yielded. Confirmed by the anon-temp witness staying green. ParamMode -> Mode conversion: Borrow -> Mode::Borrow; Own and Implicit (the Implicit ≡ Own contract) -> Mode::Owned. The own-param drop keeps reading ParamMode off f.ty (Type/ParamMode imports retained, live readers at lib.rs:1356/1507). Also retires three now-stale doc comments that named the deleted module_def_ail_types field (ailang-check/src/lib.rs, uniqueness.rs, and the codegen_import_map_fallback_pin test doc) — a direct consequence of the deletion, reworded to the current architecture. Verification (orchestrator, post-implement inspect): diff matches the plan (App-arg m_args built before m_callee consumes sig — the benign borrow-order deviation the plan's note flagged); module_def_ail_types grep-clean across all of crates/; cargo build --workspace clean (no unused/dead_code); cargo test --workspace 702 passed / 0 failed / 3 ignored (+1 = the new producer pin app_arg_carries_callee_borrow_mode; no #[ignore] added). The anon-temp drop-correctness witness raw_buf_owned_drop_balances_rc_stats stays live=0, now driven by MArg.mode; the other RC-stats leak pins green; #49 stays #[ignore] (mir.4); #51/#53 build guards green. mir.3 is now complete (3a relocated consume_count + deleted the second uniqueness run; 3b filled the mode annotation + deleted module_def_ail_types). Remaining: mir.4 (#49 StrRep RED->GREEN), mir.5 (element-type/Term::New + ledger). |
||
|
Brummel
|
6bc0b501cb |
feat(codegen): relocate per-binder consume_count into MIR; delete codegen's second uniqueness run (mir.3a)
First of two iterations delivering spec 0060's mir.3 row (plan docs/plans/0117-mir.3a-consume-count-relocation.md). The per-binder consume_count — the only thing codegen read from its second infer_module_with_cross run — now lives on a new binder-keyed MirDef.consume: BTreeMap<String,u32>, filled once by lower_to_mir on the post-mono body. Codegen builds its existing (def,binder)->consume_count lookup from those maps and the three scope-close drop sites (own-param, let-binder, match-arm) read it; the codegen uniqueness run, its UniquenessTable field, and the import are deleted. mir.3 is split into two iterations (recorded in spec 0060): the named deletion depends ONLY on consume_count. All three drop sites read consume_count from self.uniqueness, while the modes they also gate on (param_modes for the own-param dec, scrutinee_is_owned for the match dec) come from the type, not the uniqueness pass (UniquenessInfo carries no mode). So mir.3a relocates consume_count and ships the deletion; mir.3b (next) fills MArg.mode/MTerm::Let.mode and switches emit_call's anon-temp gate onto MArg.mode. The split halves the change at the codebase's highest-risk surface (RC/drop correctness, the raw-buf leak saga) and makes each half independently verifiable against the live=0 leak pins. Design: consume_count lands on MirDef (binder-keyed), NOT on MArg. The drop sites key by (def, binder_name) — a per-binder aggregate — while the spec-sketched MArg.consume_count is per-arg-position and never reaches them; the per-def map matches the UniquenessTable's own keying and all three binder kinds (param/let/pattern) uniformly. MArg.consume_count stays a mir.1 default. Source = run check's infer_module_with_cross inside lower_to_mir post-mono (the synth_pure single-engine-re-walked pattern); retaining a check-time result is blocked (check's uniqueness is pre-mono and runs on-demand-from-codegen, never in check_workspace, so it would miss the mono specialisations). cross_module_types (= codegen's module_def_ail_types) is rebuilt in elaborate_workspace from the post-mono workspace. Safety property held: this is a PURE RELOCATION of an identical computation — infer_module_with_cross ran on the post-mono module in codegen and now runs on the same post-mono module in lower_to_mir, so drop placement is byte-identical. cross_module_types matches module_def_ail_types exactly (both insert f.name->f.ty over post-mono Def::Fn), confirmed by the leak pins staying green. Verification (orchestrator, post-implement inspect): diff matches the plan; codegen grep-clean for infer_module_with_cross + UniquenessTable (now ailang-check-internal); cargo build --workspace clean (no errors, no unused warnings — module_def_ail_types survives for emit_call's anon-temp param_modes gate); cargo test --workspace 701 passed / 0 failed / 3 ignored (+1 = the new producer pin mirdef_consume_is_populated_for_let_binder; no #[ignore] added). The live=0 drop-correctness witnesses all green: alloc_rc_loop_valued_rawbuf_binder_drops_at_scope_close (#43/#47), alloc_rc_heap_loop_binder_replaced_by_recur_does_not_leak, alloc_rc_print_int_does_not_leak_show_result_str. #49 stays #[ignore] (mir.4); #51/#53 build guards green. |
||
|
Brummel
|
a6fd93adba |
feat(codegen): pre-resolve the App callee in MIR; delete is_static_callee + type_home_module (mir.2)
Second re-deriver removal of the typed-MIR milestone (spec
docs/specs/0060-typed-mir.md, plan docs/plans/0116-mir.2-callee-static.md).
Static-callee resolution moves out of codegen and into lower_to_mir:
every Term::App callee is classified once, mirroring check's own synth
Term::Var ladder (lib.rs:3409-3582), and emitted as a resolved Callee.
Codegen reads the callee identity off MIR and routes each kind to the
right lowering. The codegen re-derivers is_static_callee and
type_home_module are deleted, and the lower_app <-> is_static_callee
lockstep pair is struck from CLAUDE.md.
Callee reshape (beyond the spec's original {module, fn_name} sketch —
spec 0060's Concrete-code-shapes block is updated in this iteration):
pub enum Callee {
Static { module, fn_name, sig: Type }, // user/prelude fn -> emit_call, module pre-resolved
Builtin { name, sig: Type }, // operator/intrinsic -> inline opcode lowering
Indirect(Box<MTerm>), // dynamic: fn-pointer / closure / shadowed name
}
Two forced refinements, both settled in planning:
- sig:Type on each resolved variant. drop::synth_callee_ret_mode reads
the callee ret_mode, today off Callee::Indirect(inner).ty(). A
resolved callee has no sub-term, so the sig (= synth_pure(callee),
mode-preserving) is the lossless replacement. This is NOT a mir.3
pull-forward: the MArg param-mode / consume_count fields stay at their
mir.1 defaults. Without it, every statically-resolved call would lose
its drop signal and the RawBuf / int_to_str RC-stats pins mir.1b fixed
would regress.
- Builtin variant. Operators and the str-num builtins (+, not,
str_concat, ...) are lowered inline by name and have no module/fn_name;
a separate variant is cleaner than a sentinel module. The classifier
decides Builtin vs Static from CHECK'S OWN resolution (a name in
env.globals with no owning module is a builtin), never a copy of
codegen's old is_static_callee allowlist. The recon's divergence audit
confirmed check's builtin set and codegen's inline-arm set match
exactly, so the single-engine rule is mechanically satisfiable with no
env threading gap.
type_home_module is fully deletable: a workspace-wide grep confirmed no
program references a type-scoped T.fn as a value, so its only other
consumer (resolve_top_level_fn) collapses to the module-name fallback
with no behaviour change. (The spec's "x3 mirrors" wording over-counted;
the live surface was the definition plus two call sites.)
Alternatives rejected during planning: sentinel module in Static
(ugly); builtins left as Indirect (breaks — no fn-pointer for an
operator); name-rewrite Static{name,sig} keeping lower_app's by-name
dispatch (blurs builtin/user and still needs sig). The mir.1b
re-synth-strictness trap (post-mono synth_pure re-unify surfacing
mode-strip / bare-vs-qualified / metavar leaks) did NOT fire under the
new producer path — qualify_local_types mode-preservation and the $u
wildcard normalisation from mir.1b held.
Verification (orchestrator, post-implement inspect): diff matches the
plan; grep-clean for is_static_callee + type_home_module across
ailang-codegen and ail; cargo build --workspace green; cargo test
--workspace 700 passed / 0 failed / 3 ignored (no #[ignore] added this
iteration — the 3 are the pre-existing #49 Str-leg pin + two doctests).
Acceptance witnesses green: #53 (mono_new_over_user_adt_builds_and_runs),
#51 (rawbuf_new_int_size_only_builds_and_runs still builds), show_print
cross-module (print_user_adt_runs_end_to_end), the new mir.2 pins
(mir2_resolved_callee_kinds_run_end_to_end, callee_classification_*,
strengthened new_over_user_adt_carries_node_types asserting Callee::Static).
#49 heap-Str loop binder stays #[ignore] (lifts at mir.4).
Two new examples/ fixtures back the new pins (classify_pin.ail for the
producer classification pin, mir2_callee_kinds.ail for the E2E),
ail-parse / round-trip clean.
Forward note (cycle-close architect): crates/ail/tests/codegen_import_map_fallback_pin.rs:14-15
doc prose names lower_app's cross-module arm and synth_with_extras as
failure-mode targets — both now deleted (mir.2 / mir.1b). The pin's
protected invariant is still valid and green; the prose is stale and
wants a doc-honesty reword, left out of this iteration's footprint.
|
||
|
Brummel
|
600565d356 |
fix(check): localize own-ADT type-args in free-fn mono; complete the lower_to_mir producer
Additive producer-side work for the typed-MIR milestone (spec
docs/specs/0060-typed-mir.md), surfaced while building the mir.1b
codegen-consumption switch. Nothing here consumes MIR — codegen is
untouched; the whole existing suite stays green and one new RED pin
goes green. The mir.1b codegen switch itself stays in the working tree.
Headline fix — own-ADT type-arg localization in free-fn mono:
monomorphise_workspace's free-fn arm normalises every observed
type-arg through Registry::normalize_type_for_lookup. That
normalisation is load-bearing for cross-module dedup and a stable
specialisation symbol name, but it qualifies a *defining-module-own*
ADT to `<module>.<T>`. synthesise_mono_fn_for_free_fn then substitutes
those qualified type-args into the polymorphic source signature and
body, which are in the module's own *bare* convention (the qualify
pre-pass deliberately leaves own-module type-cons bare — lib.rs:4358,
"the current module sees its own types bare"). The result is a
self-inconsistent specialisation: e.g. fold_left specialised with
accumulator b := List<Int> minted
((std_list.List<Int>, Int) -> std_list.List<Int>,
std_list.List<Int>, List<Int>) -> std_list.List<Int>
— a qualified accumulator parameter against a bare list argument and a
bare Lam body. check_workspace never hits this (it synths the pre-mono
bodies, bare throughout); the old codegen tolerated it via the
now-deleted synth_arg_type's loose type-tracking. The post-mono synth
re-entry in lower_to_mir does full unification and correctly rejects
it: `expected std_list.List<Int>, got List<Int>`.
Fix: localize_own_types (mono.rs) strips the `<defining_module>.`
prefix back to bare for the module's own ADTs, applied to the type-args
before they are substituted, so the synthesised signature and body stay
uniformly bare-own. The *stored* type_args remain normalised, so the
symbol name and the Phase-3 rewrite-cursor key on the same canonical
form — the byte-identity invariant between synthesis and rewrite is
untouched. The ClassMethod arm needs no analogue: it already
substitutes the un-normalised target.type_ (mono.rs:841).
Alternatives rejected: (a) drop the normalisation in the shared
apply_subst_and_normalize helper — breaks cross-module dedup, mints
duplicate specialisations under divergent names. (b) Make
lower_to_mir's synth treat `<owner>.T` and bare `T` as equal during
unification — papers over the producer inconsistency in the consumer
and contradicts the established own-types-stay-bare invariant the rest
of check relies on. (c) Qualify the whole synthesised def own->qualified
— fights lib.rs:4358 and would require the lower path to also flip,
cascading the convention change through synth.
Producer completeness (additive, mirrors existing guards):
- lower_module skips Type::Forall defs (lower_to_mir.rs), mirroring
emit_module's guard. Polymorphic defs are stale source kept for
round-trip; their bodies carry mono-rewritten call names for
specialisations that were never synthesised, so a synth re-entry
would hit UnknownIdentifier.
- lower_module lowers non-literal const bodies to typed MTerm, carried
in MirModule.consts (+ MirConst in ailang-mir). A non-literal const
(e.g. a List ctor expression) needs a typed body once the consumer
walk takes &MTerm; literal consts emit a global and need no body.
- MirModule gains `ast: Module`, populated by lower_module — forward
scaffolding the mir.1b codegen consumption reads for module
structure. Populated here, consumed by the in-tree switch.
Verification: full `cargo test --workspace` green (697 passed, 0 failed)
with the codegen-consumption switch stashed out, including the new pin
crates/ailang-check/tests/lower_to_mir_ty.rs::poly_free_fn_accumulating_into_own_adt_elaborates
(RED before the localize fix with the exact mismatch above, GREEN after)
and the full e2e corpus (the own-ADT-poly demos elaborate clean and run
through the old codegen). This proves the producer fix is
regression-free and the remaining 22 e2e reds in the working tree are
codegen-consumption defects, not producer defects.
|
||
|
Brummel
|
135f4ceed7 |
feat(check): mir.1a — typed-MIR types + post-mono lower_to_mir + elaborate_workspace (additive)
First half of spec iteration mir.1 (docs/specs/0060-typed-mir.md, plan docs/plans/0114-mir.1a-mir-infrastructure.md). Purely additive: a new leaf crate plus a post-mono lowering walk plus the front-end entry. Nothing consumes MIR yet — codegen and the CLI are untouched — so the whole existing suite stays green (102 test-result-ok lines, 0 failed; the one ignored is the #49 pin, which lifts at mir.4). mir.1b flips codegen to consume MIR and deletes the synth_with_extras mirror. What lands: - `ailang-mir` (new leaf crate, depends only on ailang-core): MTerm / MArg / MArm / MLoopBinder / MNewArg / Callee / Mode / StrRep / MirDef / MirModule / MirWorkspace, structurally complete over all 17 Term variants plus the dedicated Str split (MTerm::Str{lit,rep}). Every later-iteration annotation field exists now at a mir.1 default (App.callee = Indirect, MArg.mode/consume_count = Owned/1, Str.rep = Static, New.elem = None); the struct shape will not change across mir.2–mir.5, only the values. MTerm::ty() reads the carried type. - `ailang-check::lower_to_mir`: the post-mono walk. Carries no second type engine — it calls the canonical `synth` per node with fresh throwaway inference scaffolding (subst/counter/residuals/…), applies the substitution, and threads only the lexical locals/loop_stack, maintained by the same push/pop rules synth uses (Let, Loop, Lam, LetRec, and Match via synth's own type_check_pattern). This is the "one engine, not two" property the milestone buys, on the producer side. - `ailang-check::elaborate_workspace`: the single front-end entry — check (diagnostics gate) → desugar+lift → monomorphise → lower_to_mir — transcribed from the CLI build path. check_workspace stays for the diagnostics-only callers. - Three ty-fill pins (crates/ailang-check/tests/lower_to_mir_ty.rs) load the #51/#53/#49 witnesses as fixtures and elaborate the whole workspace, so lower_to_mir is exercised over the full prelude+kernel, not just the tiny witness. Two new witness fixtures (examples/new_{rawbuf_size_only,counter_user_adt}.ail); #49 reuses the existing loop_recur_str_binder_no_leak_pin.ail. Deviations from the plan, all forced by ground truth and verified against the live code before commit: - FnDef.export is Option<String>, not bool — dropped from MirDef (the plan's note allowed this fallback). Codegen reads FnDef.export directly, unaffected. - fn_param_types did not exist — lifted the param-type extraction into a shared pub(crate) fn and rewired both mono.rs sites (collect_mono_targets, collect_rewrite_targets) to it, so the param-type source cannot drift between mono and lower_to_mir. The helper unwraps a top-level Forall then reads Type::Fn.params — identical to the inner_ty extraction it replaces; the early-return non-fn guard is preserved at both sites. Behaviour-preserving (whole suite green; this is the only edit to existing mono behaviour). - lower_module mirrors two more mono.rs scaffolding rules the plan under-transcribed: skip intrinsic-bodied fns (they are signature-only; lowering them would hit synth's Term::Intrinsic guard) and seed env.current_module + env.globals + env.imports per module so synth's Var lookup resolves post-mono specialisations (e.g. compare__Int) in the prelude. - The #53 pin asserts the lowered (new Counter 42) init carries ty Counter, not that it is an MTerm::New: a monomorphic `new` over a user ADT is desugared to a dotted call `(app Counter.new 42)` before lower_to_mir runs (desugar.rs:1078-1098), so it lowers to MTerm::App. MTerm::New survives only for a polymorphic `new` carrying a written NewArg::Type (the #51 RawBuf path, covered by the rawbuf pin). The pin's intent — ty-fill correctness — is preserved; the structural variant is mir.2/mir.5 territory. - ailang-mir uses workspace-inherited Cargo fields for consistency with the existing crates (added it to [workspace.dependencies]). refs #49 |