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>
giles
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