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Phase 4 cont. go-eval-stmt dispatches on: :return → wraps value in (:return-value V) sentinel :var-decl → bind each NAME via go-eval-var-decl :short-decl → bind each (:var NAME) lhs to corresponding expr value :assign → immutable-env shadowing (true mutation deferred) :block → run stmts via go-eval-block, propagating :return-value :if / :else → cond-driven dispatch :func-decl → bind name to (list :go-fn PARAMS BODY) else → expression statement, evaluate for side effects go-eval-call extends the CALLER's env with param-names → arg-values (dynamic-scope-ish — closures don't capture lexical env yet), runs the body block, catches :return-value and unwraps. **Recursive fib(5) = 5 evaluates correctly.** Recursion works because top-level func bindings are in the calling env before the recursive call happens. True lexical closures (let bind sees outer var; assignments visible to nested funcs) need an env-cell model with mutation; deferred to a later slice. eval 33/33, total 410/410. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>