nyash-codex
a0009d474d
feat(mir): Loop Canonicalizer Phase 3 - skip_whitespace pattern recognition
## Summary
skip_whitespace パターンを Skeleton→Decision で認識可能に。
dev-only 観測で chosen=Pattern3IfPhi / missing_caps=[] を固定。
## Changes
- src/mir/loop_canonicalizer/mod.rs:
- try_extract_skip_whitespace_pattern() 追加
- loop(cond) { ... if check { p = p + 1 } else { break } } パターン認識
- carrier name, delta, body statements を抽出
- canonicalize_loop_expr() 拡張(skip_whitespace 対応)
- Pattern3IfPhi 成功時は RoutingDecision::success 返却
- Skeleton に HeaderCond, Body, Update ステップ追加
- CarrierSlot に Counter role 設定
- ExitContract に has_break=true 設定
- Phase 3 unit tests 追加
- test_skip_whitespace_pattern_recognition: 基本パターン
- test_skip_whitespace_with_body_statements: body 付きパターン
- test_skip_whitespace_fails_without_else: else なし失敗
- test_skip_whitespace_fails_with_wrong_delta: 減算パターン失敗
- Phase 2 obsolete tests 削除
- src/mir/builder/control_flow/joinir/routing.rs:
- Debug 出力拡張(chosen pattern 表示)
## Tests
- cargo test --release --lib loop_canonicalizer::tests: PASS(11 tests)
- cargo test --release --lib: PASS(1044 tests, 退行なし)
- HAKO_JOINIR_DEBUG=1 test_pattern3_skip_whitespace.hako:
- chosen=Pattern3IfPhi ✅
- missing_caps=[] ✅
## Validation
- ✅ dev-only 観測(HAKO_JOINIR_DEBUG=1)のときだけログ出力
- ✅ フラグ OFF 時は完全不変
- ✅ skip_whitespace パターンで SUCCESS 固定
- ✅ unit tests で全パターン固定
Phase 137-3 complete
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..
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