iter ext-rename: .ailx → .ail across the live toolchain
The surface-form file extension changes from .ailx to .ail. AILang's
authoring surface now uses the same .ail stem as its canonical JSON
form (.ail.json), giving the language a single coherent extension
family: .ail is the LLM-authored Form A, .ail.json is the canonical
JSON-AST Form B.
Scope (touched):
- 61 example renames examples/**/*.ailx → .ail (git mv)
- 1 rename experiments/.../rendered/ailx.md → ail.md
- 35 content-edited live-toolchain files (crates/, docs/DESIGN.md,
docs/roadmap.md, docs/PROSE_ROUNDTRIP.md, skills/, bench/reference/*.c,
experiment crates under experiments/.../{render,harness,master})
- Experiment-crate cohort rename Cohort::Ailx → Cohort::Ail,
Form::Ailx → Form::Ail, per_cohort/ailx → per_cohort/ail,
{form-only: ailx} → {form-only: ail}, ```ailx → ```ail
Out of scope (deliberately untouched, to preserve honest history):
- docs/journal-archive.md (content-frozen per CLAUDE.md)
- docs/journals/, docs/specs/, docs/plans/, bench/orchestrator-stats/
- experiments/.../runs/ (frozen LLM-output artefacts; models actually
saw .ailx — renaming would falsify the experimental record)
Verification: cargo build/test --workspace green; experiment crate
cargo test green; bench/check.py + compile_check.py + cross_lang.py
all 0-regressed; negative grep for ailx|Ailx|AILX outside the
out-of-scope paths returns zero matches.
Opens immediate follow-up: roadmap.md P2 todo `ail check`/build/run
accept .ail extension — after this rename, .ail is canonical
authoring surface but the CLI still produces a misleading JSON-parse
error on `ail check foo.ail`. That's the next iter.
This commit is contained in:
@@ -0,0 +1,196 @@
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; Iter 15b — second stdlib module: polymorphic singly-linked lists.
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; Imports std_maybe so head/tail can return Maybe<a> / Maybe<List<a>>.
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; All cross-module references use the qualified form per the Iter 14h
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; convention: `std_maybe.Maybe` at type-name slots, `std_maybe.from_maybe`
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; for fns. Bare ctor names (`Just`, `Nothing`) stay unqualified — once
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; the type is resolved the ctor lookup is unambiguous.
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(module std_list
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(import std_maybe)
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(data List (vars a)
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(doc "Polymorphic singly-linked list: Nil or Cons<a, List<a>>.")
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(ctor Nil)
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(ctor Cons a (con List a)))
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(fn fold_left
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(doc "Tail-recursive left fold. The recursive call is in tail position and is marked.")
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(type
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(forall (vars a b)
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(fn-type
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(params (fn-type (params b a) (ret b))
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b
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(con List a))
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(ret b))))
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(params f acc xs)
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(body
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(match xs
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(case (pat-ctor Nil) acc)
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(case (pat-ctor Cons h t)
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(tail-app fold_left f (app f acc h) t)))))
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(fn fold_right
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(doc "Right fold. Constructor-blocked: the recursive call is the second arg of f, NOT a tail position.")
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(type
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(forall (vars a b)
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(fn-type
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(params (fn-type (params a b) (ret b))
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b
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(con List a))
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(ret b))))
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(params f acc xs)
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(body
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(match xs
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(case (pat-ctor Nil) acc)
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(case (pat-ctor Cons h t)
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(app f h (app fold_right f acc t))))))
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(fn length
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(doc "Length via fold_left. The accumulating lambda ignores the element and increments the counter.")
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(type
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(forall (vars a)
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(fn-type
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(params (con List a))
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(ret (con Int)))))
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(params xs)
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(body
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(app fold_left
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(lam (params (typed c (con Int)) (typed _ a))
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(ret (con Int))
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(body (app + c 1)))
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0
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xs)))
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(fn reverse
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(doc "Reverse via fold_left with a flipping accumulator. Tail-recursive by virtue of the fold_left call.")
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(type
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(forall (vars a)
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(fn-type
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(params (con List a))
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(ret (con List a)))))
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(params xs)
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(body
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(app fold_left
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(lam (params (typed acc (con List a)) (typed h a))
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(ret (con List a))
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(body (term-ctor List Cons h acc)))
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(term-ctor List Nil)
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xs)))
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(fn is_empty
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(doc "True iff the list is Nil.")
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(type
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(forall (vars a)
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(fn-type
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(params (con List a))
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(ret (con Bool)))))
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(params xs)
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(body
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(match xs
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(case (pat-ctor Nil) true)
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(case (pat-ctor Cons _ _) false))))
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(fn head
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(doc "Returns Just<a> of the first element, or Nothing for an empty list. Cross-module Maybe.")
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(type
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(forall (vars a)
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(fn-type
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(params (con List a))
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(ret (con std_maybe.Maybe a)))))
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(params xs)
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(body
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(match xs
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(case (pat-ctor Nil) (term-ctor std_maybe.Maybe Nothing))
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(case (pat-ctor Cons h _) (term-ctor std_maybe.Maybe Just h)))))
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(fn tail
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(doc "Returns Just<List<a>> of the tail, or Nothing for an empty list.")
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(type
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(forall (vars a)
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(fn-type
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(params (con List a))
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(ret (con std_maybe.Maybe (con List a))))))
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(params xs)
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(body
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(match xs
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(case (pat-ctor Nil) (term-ctor std_maybe.Maybe Nothing))
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(case (pat-ctor Cons _ t) (term-ctor std_maybe.Maybe Just t)))))
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(fn append
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(doc "Concatenate two lists. Constructor-blocked recursion: the recursive call is inside Cons, NOT a tail.")
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(type
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(forall (vars a)
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(fn-type
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(params (con List a) (con List a))
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(ret (con List a)))))
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(params xs ys)
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(body
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(match xs
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(case (pat-ctor Nil) ys)
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(case (pat-ctor Cons h t)
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(term-ctor List Cons h (app append t ys))))))
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(fn map
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(doc "Polymorphic map. Constructor-blocked recursion.")
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(type
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(forall (vars a b)
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(fn-type
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(params (fn-type (params a) (ret b))
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(con List a))
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(ret (con List b)))))
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(params f xs)
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(body
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(match xs
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(case (pat-ctor Nil) (term-ctor List Nil))
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(case (pat-ctor Cons h t)
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(term-ctor List Cons (app f h) (app map f t))))))
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(fn filter
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(doc "Keep elements where p is true. Constructor-blocked when p holds; non-tail recursive call when p is false.")
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(type
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(forall (vars a)
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(fn-type
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(params (fn-type (params a) (ret (con Bool)))
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(con List a))
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(ret (con List a)))))
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(params p xs)
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(body
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(match xs
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(case (pat-ctor Nil) (term-ctor List Nil))
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(case (pat-ctor Cons h t)
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(if (app p h)
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(term-ctor List Cons h (app filter p t))
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(app filter p t))))))
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(fn take
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(doc "First n elements of xs (or all of xs if it has fewer than n).")
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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) (con List a))
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(ret (con List a)))))
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(params n xs)
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(body
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(if (app <= n 0)
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(term-ctor List Nil)
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(match xs
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(case (pat-ctor Nil) (term-ctor List Nil))
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(case (pat-ctor Cons h t)
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(term-ctor List Cons h (app take (app - n 1) t)))))))
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(fn drop
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(doc "All elements of xs after the first n (or Nil if xs has fewer than n elements).")
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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) (con List a))
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(ret (con List a)))))
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(params n xs)
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(body
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(if (app <= n 0)
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xs
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(match xs
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(case (pat-ctor Nil) (term-ctor List Nil))
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(case (pat-ctor Cons _ t)
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(app drop (app - n 1) t)))))))
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