giles cd414b96a7 Step 7a complete: ->> |> as-> pipe operators + transpiler fixes ...

Three new threading operators in evaluator.sx:
- ->> (thread-last): inserts value as last arg
- |> (pipe): alias for ->> (F#/OCaml convention)
- as-> (thread-anywhere): binds value to named variable

  (->> 10 (- 3))           ;; => -7  (thread-last: (- 3 10))
  (-> 10 (- 3))            ;; => 7   (thread-first: (- 10 3))
  (->> 1 (list 2 3))       ;; => (2 3 1)
  (as-> 5 x (+ x 1) (* x 2)) ;; => 12

Two transpiler bugs fixed:
1. Non-recursive functions (let without rec) weren't chained as `and`
   in the let rec block — became local bindings inside previous function
2. CekFrame "extra" field wasn't in the cf_extra key mapping — mode
   was always Nil, making thread-last fall through to thread-first

Also: added missing step-sf-case definition to evaluator.

2644 tests pass, zero regressions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-04 14:29:40 +00:00

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