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Brummel a1692a4859 iter 23.4: mono-pass unification — class methods + polymorphic free fns in one fixpoint

Restructure ailang-check/src/mono.rs::monomorphise_workspace into a
single specialiser over every Type::Forall-quantified Def::Fn, covering
both class-method residuals AND polymorphic free-fn call sites in one
fixpoint pass. Remove the codegen-time specialiser (lower_polymorphic_call,
module_polymorphic_fns, mono_queue, mono_emitted, emit_specialised_fn,
plus the now-dead helpers apply_subst_to_term, descriptor_for_subst,
type_descriptor) entirely. Codegen sees only monomorphic Def::Fns after
this iter — no polymorphic call sites, no codegen-time queue.

Architecture changes:
- MonoTarget: struct → enum with ClassMethod / FreeFn variants; dedup
  keys are guaranteed-disjoint via 'class'/'free' first component.
- collect_mono_targets: new FreeFnCall channel through synth (cleaner
  than the plan's separate-walker proposal — one less data flow,
  substitution tracking comes 'for free' via fresh metavars +
  post-synth subst.apply). Plan Step 4.4 (polymorphic_free_fns env
  field) consequently obsolete.
- synthesise_mono_fn_for_free_fn: new free-fn entry point; substitutes
  rigid vars in BOTH the type AND the body (body substitution required
  because free-fn bodies carry inner Lams whose param_tys reference
  outer Forall vars — adapted from plan's 'body unchanged' sketch).
- mono_symbol_n: N-ary extension of mono_symbol; bit-stable for the
  single-type-var case (hash-stability pin Task 1 fires zero times
  through all eight refactor tasks).
- rewrite_class_method_calls → rewrite_mono_calls; interleaved-slot
  collector preserves the positional-cursor invariant across both
  channels.
- workspace_has_typeclasses → workspace_has_specialisable_targets
  (principled correctness; old predicate happened to already be true
  for every user workspace because the prelude is auto-injected).

Codegen cleanup:
- Two call sites of lower_polymorphic_call deleted (codegen/src/lib.rs
  lines ~1939-1945, ~1965-1973).
- lower_polymorphic_call body, module_polymorphic_fns field +
  population + Emitter wiring, mono_queue / mono_emitted, drain loop,
  emit_specialised_fn — all removed.
- is_static_callee collapsed to module_user_fns-only.
- subst.rs apply_subst_to_term + descriptor_for_subst removed; synth.rs
  type_descriptor removed (all dead post-removal).
- ail emit-ir command pipeline gains lift_letrecs + monomorphise_workspace
  pre-passes (pre-iter-23.4 the codegen-time poly path was masking
  this dependency — emit-ir is now consistent with build).
- Net codegen reduction: -285 lines lib.rs, -93 lines subst.rs.

Tests:
- mono_hash_stability.rs (new): regression pin for six primitive Eq/Ord
  mono-symbol body hashes; stayed bit-stable through all eight refactor
  tasks.
- mono_unification.rs (new): six tests covering variant-key disjointness,
  free-fn target emission, free-fn synthesis with rigid substitution,
  rewrite walker on free fns, identity for poly-free-fn-only workspaces,
  end-to-end cmp_max_smoke runtime correctness.
- typeclass_22b3.rs: three test sites updated to MonoTarget::ClassMethod
  enum form.
- 73 e2e + 18 typeclass + 81 codegen tests all green workspace-wide.

DESIGN.md §'Monomorphisation (post-typecheck, pre-codegen)' amended:
two-arm fixpoint described, disjoint-keyed dedup, cursor-aligned
walker, removed codegen-time path.

Bench check (all exit 0, 112 metrics stable): bench/check.py +
compile_check.py + cross_lang.py.

Plan parent: docs/plans/2026-05-11-iter-23.4.md (fab1685).
Spec parent: docs/specs/2026-05-11-23-eq-ord-prelude.md (841d65d).
Per-iter journal documents two adapted deviations from the plan
(synth-channel vs separate walker; body substitution; emit-ir fix);
no spec defects.

2026-05-11 23:59:45 +02:00

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Journal index

Chronological pointer list of per-iter journal files. Append-only. One line per iter, newest at the bottom. Filenames are relative to docs/journals/.

pre-2026-05-11 — see ../journal-archive.md for all prior history
2026-05-11 — iter or.1: orchestrator-refactor → 2026-05-11-iter-or.1.md
2026-05-11 — fieldtest canonical-type-names → 2026-05-11-fieldtest-canonical-type-names.md
2026-05-11 — iter pr.1: plan-recon subagent → 2026-05-11-iter-pr.1.md
2026-05-11 — iter or.2: orchestrator-agent design correction (no nested subagent dispatch) → 2026-05-11-iter-or.2.md
2026-05-11 — iter cadence: audit/fieldtest/docwriter cadence restructure → 2026-05-11-iter-cadence.md
2026-05-11 — iter 23.4-prep: checker prerequisites for prelude free fns → 2026-05-11-iter-23.4-prep.md
2026-05-11 — iter gc.1: grounding-check agent + brainstorm Step 7.5 → 2026-05-11-iter-gc.1.md
2026-05-11 — iter disc.1: boss-only commits + main-as-quarantine (no branches in implement) → 2026-05-11-iter-disc.1.md
2026-05-11 — iter 23.4: mono-pass unification (class methods + polymorphic free fns in one fixpoint; codegen-time specialiser removed) → 2026-05-11-iter-23.4.md

1.2 KiB Raw Blame History

Journal index

1.2 KiB

Raw Blame History