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.
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57 lines
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; Iter 16e — `==` extends from Int-only to Int/Bool/Str/Unit (polymorphic
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; dispatch). The builtin's declared type became
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; forall a. (a, a) -> Bool
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; and codegen monomorphises on the resolved arg type:
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; Int → icmp eq i64
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; Bool → icmp eq i1
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; Str → @strcmp + icmp eq i32 0
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; Unit → constant i1 true (single-inhabitant type)
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; ADT/Fn → rejected at codegen with a clear error.
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;
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; This fixture exercises all four supported types, both directly via
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; `(app == ...)` and indirectly via 16c's lit-pattern desugar (which
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; rewrites `(pat-lit "hi")` → `(if (== sv "hi") body fall_k)` and
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; therefore inherits 16e's polymorphic `==`).
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;
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; Expected stdout (one per line):
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; true ; (== 5 5)
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; false ; (== 5 6)
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; false ; (== true false)
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; true ; (== true true)
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; true ; (== "hi" "hi")
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; false ; (== "hi" "ho")
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; true ; (== () ())
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; 1 ; classify_str "hi" (lit-pattern hits 1 arm)
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; 2 ; classify_str "ho" (lit-pattern hits 2 arm)
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; 0 ; classify_str "??" (default arm)
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;
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; Driver routes through the polymorphic `print` helper (Show Bool / Show Int).
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(module eq_demo
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(fn classify_str
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(doc "Lit-pattern over Str; exercises 16c's build_eq for non-Int.")
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(type (fn-type (params (con Str)) (ret (con Int))))
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(params s)
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(body
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(match s
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(case (pat-lit "hi") 1)
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(case (pat-lit "ho") 2)
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(case _ 0))))
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(fn main
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(doc "Drive == at Int/Bool/Str/Unit; then drive classify_str.")
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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 == 5 5))
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(seq (app print (app == 5 6))
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(seq (app print (app == true false))
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(seq (app print (app == true true))
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(seq (app print (app == "hi" "hi"))
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(seq (app print (app == "hi" "ho"))
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(seq (app print (app == (lit-unit) (lit-unit)))
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(seq (app print (app classify_str "hi"))
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(seq (app print (app classify_str "ho"))
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(app print (app classify_str "??"))))))))))))))
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