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JS var is function-scoped, but the transpiler only collected top-level vars and re-emitted (define) everywhere; for-body var shadowed the outer (un-hoisted) scope. Three-part fix: 1. js-collect-var-names recurses into js-block/js-for/js-while /js-do-while/js-if/js-try/js-switch/js-for-of-in; 2. var-kind decls emit (set! ...) instead of (define ...) since the binding is already created at function scope; 3. js-block uses js-transpile-stmt-list (no re-hoist) instead of js-transpile-stmts. built-ins/Array: 17/45 → 18/45, String: 77/99 → 78/99. conformance.sh: 148/148.