Single iter shipping the post-milestone-24 follow-up named in
docs/specs/2026-05-14-retire-per-type-print-effects.md. After this
iter the only surviving direct-output effect-op is `io/print_str`;
all per-type print primitives are replaced by the polymorphic
`print` helper (prelude, iter 24.3).
Components:
- 92 examples/*.ail fixtures migrated (do io/print_<T> x) →
(app print x); 6 .prose.txt snapshots regenerated via `ail prose`.
- Four-site lockstep compiler deletion: crates/ailang-check/src/builtins.rs
(3 effect_ops.insert blocks + 3 list() rows + the
install_io_print_float_signature test + module + EffectOpSig
doc-comments); crates/ailang-codegen/src/lib.rs lower_app
(3 arms + lowers_io_print_float test); crates/ailang-codegen/src/synth.rs
builtin_effect_op_ret match-arm pattern. Dead `intern_string`
helper removed as a follow-up.
- Five incidental test-body migrations (ailang-check x2, ailang-core
spec_drift + design_schema_drift, ailang-surface/src/lex.rs,
ailang-prose/src/lib.rs round-trip test).
- Cat B test-harness patch: six IR-shape tests in
crates/ail/tests/e2e.rs gained a monomorphise_workspace call
before lower_workspace_with_alloc so they follow the same
pipeline as `ail build` (the home-rolled desugar+lift loop
stayed because mono's precondition is "already lifted"; mono
inserts after lift).
- Six doc-comment touch-ups (lex.rs module doc, parse.rs
diagnostic example, ail/src/main.rs x2, runtime/str.c %g anchor,
crates/ailang-core/specs/form_a.md surface-spec example).
- DESIGN.md seven-site sweep (Decision 11 example, Polymorphic
print past-tense, Heap-Str output sentence, effect-op
invocation comment, Float NaN paragraph re-anchored on
float_to_str, two "What is supported" lists).
- Three E2E test-comment polish + four IR-snapshot refresh + one
canonical-hash pin update (plan-unanticipated downstream
consequences of the corpus migration).
- bench/{check,compile_check,cross_lang}.py: all exit 0; no
ratification needed.
- Roadmap entry struck through; per-iter journal at
docs/journals/2026-05-14-iter-rpe.1.md.
Tests 564/0/3. cargo clippy and cargo doc: zero warnings.
Two upstream codegen bugs surfaced during the first BLOCKED
attempt and were fixed in separate iters before this retry:
- 1fb225e bugfix: mono cursor misalignment at poly-free-fn Var
with class-constrained Forall.
- feb9413 bugfix: print leak — propagate ret_mode through rigid
substitution + prelude Show.show ret_mode.
Known debt (carried forward for next /audit):
- Emitter.strings field is functionally dead post-iter (orphan
after intern_string removal); cycles over empty map harmlessly.
reuse-as: render `(reuse-as src body)` as `reuse src as body` with
adaptive braces — inline for single-line bodies (the 99% Ctor case),
braced for multi-line (Let, Seq, nested Match). Reads as English
subject-verb-object instead of compound keyword + always-block.
let-inlining: `let x = rhs; <body using x once>` collapses to
`<body[x := rhs]>` when (a) rhs is not a `Term::Do` (keep effect
sequencing visible), (b) x is used exactly once (no work duplication),
(c) rhs renders single-line AND ≤ 40 chars (no line smearing). Lossy
projection — round-trip mediator sees the original .ail.json and can
re-introduce a let when the mode model demands it.
Helpers `count_free_var` and `subst_var_with_term` are render-local;
both respect inner shadowing (let, lam, match arm pattern binders,
let rec). Pre-render value at current level + check for newline + len
budget; on inline, write_term_prec gets passed parent_prec so the
substituted term still wraps correctly inside binops.
Snapshot drift: rc_app_let_partial_drop_leak.prose.txt — boilerplate
`let p = build_pair(1)` collapsed into the match scrutinee. Improves
readability. Cons-tower in rc_own_param_drop kept its let thanks to
the length budget (52 chars > 40).
Tests: 59 unit (+ 9 new) + 4 snapshot, all green. Coverage:
inline-single-use, two-uses-keeps, zero-uses-keeps, Do-rhs-keeps,
multiline-rhs-keeps, length-budget-keeps, shadowing-not-counted,
reuse-as inline + braces.
Brummel