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Phase 200-B: FunctionScopeCaptureAnalyzer implementation - analyze_captured_vars_v2() with structural loop matching - CapturedEnv for immutable function-scope variables - ParamRole::Condition for condition-only variables Phase 200-C: ConditionEnvBuilder extension - build_with_captures() integrates CapturedEnv into ConditionEnv - fn_body propagation through LoopPatternContext to Pattern 2 Phase 200-D: E2E verification - capture detection working for base, limit, n etc. - Test files: phase200d_capture_minimal.hako, phase200d_capture_in_condition.hako Phase 201-A: MirBuilder reserved_value_ids infrastructure - reserved_value_ids: HashSet<ValueId> field in MirBuilder - next_value_id() skips reserved IDs - merge/mod.rs sets/clears reserved IDs around JoinIR merge Phase 201: JoinValueSpace design document - Param/Local/PHI disjoint regions design - API: alloc_param(), alloc_local(), reserve_phi() - Migration plan for Pattern 1-4 lowerers 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
MIR Builder — Calls SSOT
Scope
- This directory is the single source of truth for call shaping in the builder.
- Responsibilities: target resolution, extern mapping, method lookup, flags/effects, MIR emission.
Out of scope
- Runtime dispatch details (VM/LLVM) and legacy by-name resolution. The VM keeps a legacy resolver only behind a dev flag for bring-up.
Contract
- Builder must populate
MirInstruction::Callwith a concreteCalleewhenever possible. - Arity and canonical names are normalized here so runtimes can be simple routers.
Phase-3 alignment
- VM call resolver is treated as legacy-only. Default runtime disables by-name fallback.
- Extern interface normalization aligns with
handlers/calls/externs.rs(runtime SSOT for extern dispatch).