Brummel
6fdb45d2f2
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.
58 lines
2.1 KiB
Plaintext
58 lines
2.1 KiB
Plaintext
; Iter 16b.6 — LetRec inside a polymorphic enclosing fn.
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; `apply_n_times : Forall(a). Fn(Int, a, Fn(a) -> a) -> a`
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; applies `f` to `x` exactly `n` times. The recursive helper `loop`
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; captures `f` from the enclosing fn's params — `f`'s declared type
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; is `Fn(a) -> a`, which mentions the outer fn's type var `a`. The
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; 16b.6 lift produces a synthetic top-level fn
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; `loop$lr_0 : Forall(a). Fn(Int, a, Fn(a) -> a) -> a`
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; and rewrites `(app loop k acc)` → `(app loop$lr_0 k acc f)`.
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;
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; `main` drives `apply_n_times` at TWO distinct type instantiations
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; so codegen's monomorphisation queue picks up `loop$lr_0` twice
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; (once at `a = Int` to compute `succ` applied 5x to 0 → 5; once at
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; `a = Bool` to compute `not` applied 4x to false → false). This
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; exercises the substitution of the outer Forall.vars into both the
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; original LetRec params and the appended capture types.
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;
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; Expected stdout (one per line): 5, false.
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(module poly_rec_capture
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(fn succ
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(doc "Helper: increment Int. Used as the Fn(Int) -> Int instance.")
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(type (fn-type (params (con Int)) (ret (con Int))))
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(params x)
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(body (app + x 1)))
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(fn flip
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(doc "Helper: boolean negation as a top-level fn (so it has an adapter for value-position).")
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(type (fn-type (params (con Bool)) (ret (con Bool))))
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(params b)
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(body (app not b)))
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(fn apply_n_times
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(doc "Apply f to x exactly n times. Polymorphic in a.")
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(type
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(forall (vars a)
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(fn-type
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(params (con Int) a (fn-type (params a) (ret a)))
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(ret a))))
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(params n x f)
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(body
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(let-rec loop
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(params k acc)
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(type (fn-type (params (con Int) a) (ret a)))
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(body
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(if (app == k 0)
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acc
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(app loop (app - k 1) (app f acc))))
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(in (app loop n x)))))
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(fn main
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(doc "Drive apply_n_times at Int (succ 5 times from 0) and Bool (not 4 times from false).")
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(type (fn-type (params) (ret (con Unit)) (effects IO)))
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(params)
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(body
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(seq (app print (app apply_n_times 5 0 succ))
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(app print (app apply_n_times 4 false flip))))))
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