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
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58 lines
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; Iter 17a — first fixture exercising the per-fn arena (alloca for
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; non-escaping allocations).
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;
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; `peek` builds a Box(n) and immediately matches on it, returning
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; a literal Int that does not depend on the box's payload. The
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; box's value is fully consumed by the local match — it never
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; flows to a fn arg, never becomes a ctor field, never returns.
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; Iter 17a's escape analysis flags the `(term-ctor Box MkBox n)`
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; allocation as non-escaping; codegen lowers it to LLVM `alloca`
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; instead of `@GC_malloc`. Boehm's heap is not touched at all by
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; this fn.
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;
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; `count` repeats the same pattern under recursion: each call to
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; `count` builds a fresh Box(_), matches it, and returns either 0
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; or 1 + (count rest). Without the alloca optimisation, each
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; recursive frame leaks a Box onto the GC heap until collection;
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; with the optimisation, each frame's Box dies with its frame.
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;
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; Expected stdout (one per line):
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; 42 — peek(0) returns the literal 42 from the only arm
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; 42 — peek(123) ditto (the input value never reaches stdout)
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; 5 — count(5)
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; 0 — count(0)
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(module escape_local_demo
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(data Box (vars a)
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(ctor MkBox a))
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(fn peek
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(doc "Build a Box(n), discard the payload, return 42. The Box is non-escaping.")
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(type (fn-type (params (con Int)) (ret (con Int))))
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(params n)
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(body
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(let b (term-ctor Box MkBox n)
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(match b
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(case (pat-ctor MkBox _) 42)))))
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(fn count
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(doc "Recurse n times; each call builds a temporary Box, discards its payload via _, and returns 0 if n<=0, else 1 + count(n-1).")
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(type (fn-type (params (con Int)) (ret (con Int))))
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(params n)
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(body
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(if (app <= n 0)
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0
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(let b (term-ctor Box MkBox n)
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(match b
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(case (pat-ctor MkBox _) (app + 1 (app count (app - n 1)))))))))
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(fn main
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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 peek 0))
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(seq (app print (app peek 123))
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(seq (app print (app count 5))
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(app print (app count 0))))))))
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