[proggeramlug]

Summary

• Closes perry-codegen: residual link errors on Effect — bare _pull + class-as-function references (Union/Emit/Order) #461 (bare _pull symbol — last residual link error from the Effect repro after perry-codegen: export { local as keyword } re-exports don't emit definitions for contextual-keyword names (void/async/await/try/delete/continue) #460/DX: unify R005 / #463 message format across all unimplemented-API rejection paths (perry/ui, perry/media, perry/plugin, perry/updater) #525 closed Order/Union/Emit).
• Pre-registers const f = (arrow) / const f = function() {} locals in lower_var_decl_with_destructuring BEFORE lowering the init, mirroring what function f() {} decls already do — so self-recursive references inside the closure body resolve via lookup_local instead of falling through to lookup_imported_func and emitting a bare symbol at link time.
• Gated on function-expression init only, so const x = x + 1 keeps its (correct) TDZ-violation semantics.

Root cause

Effect's internal/stream.ts has both:

1. import * as pull from "./stream/pull.js" (namespace import at module top)
2. const pull = (state, ...) => { … pull(...) … } (local rebinding inside three exported functions)

Without pre-registration, the inner closures' pull(...) reference saw lookup_local("pull") == None → lookup_imported_func("pull") == Some("pull") → HIR lowered as Expr::ExternFuncRef { name: "pull" } → lower_call.rs::ExternFuncRef's "Native library functions" fallback emitted call double @pull(...) → linker: Undefined symbol: _pull.

Test plan

• Multi-file repro (import * as pull + const pull rebind): returns 101 / 101 matching Node (was: _pull undefined at link)
• Direct self-recursion: const fac = (n) => n < 2 ? 1 : n * fac(n-1) returns 120 / 3628800
• Function-expression init: const fib = function(n) { ... } returns 55
• Self-reference through nested arrow returning recursive helper: returns 15
• Effect's bun add effect && perry compile test_minimal.ts: _pull no longer appears in undefined symbols (remaining errors are unrelated cross-module references — _perry_fn_…_{Cron,Duration,Graph}_ts__* — separate issue, not blocking perry-codegen: residual link errors on Effect — bare _pull + class-as-function references (Union/Emit/Order) #461)
• Parity sweep: 209 pass / 3 known fails / 1 known compile-fail / 13 skipped (98.5%, no regressions)
• Closure-focused tests (test_edge_closures, test_gap_closures, test_returning_closures) all PASS

Notes

The fix should also benefit any pre-bundled npm package that uses the var X = (...) => …; export { X }; pattern where X is recursive AND a same-named module is namespace-imported elsewhere — the Effect surface has dozens of such shapes.