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AILang/examples/local_rec_match_capture.ail.json
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Brummel c0668178bb Iter 16b.4: LetRec captures of match-arm pattern bindings
Flips the desugar's MatchArm-capture rejection from panic to defer.
The 16b.3 lift_letrecs pass already handled match-arm bindings via
type_check_pattern_for_lift (Pattern::Var, Pattern::Ctor with sub-
patterns, ctor-field substitution against scrutinee args), so this
iter is a single-line classification change in desugar plus the
fixture and tests that exercise it.

- desugar.rs: MatchArm classification now defers (same arm as
  LetBound); EnclosingLetRec panic remains for 16b.7.
- examples/local_rec_match_capture.{ailx,ail.json}: enclosing fn
  pattern-matches on Pair<Int,Int>, inner LetRec captures both
  match-arm bindings simultaneously. Lifts to
  loop$lr_0(i: Int, threshold: Int, n: Int) -> Int.
- e2e + check + desugar tests: 110 → 113 (+3).

First fixture lifting more than one capture; subst_call_with_extras
already handled it generically.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-07 22:16:12 +02:00

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