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go: eval.sx — stmts + function application; recursive fib evaluates + 8 tests [nothing]

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>

2026-05-27 21:17:26 +00:00

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Total: 410 / 410 tests passing

	Suite	Pass	Total
✅	lex	129	129
✅	parse	176	176
✅	types	72	72
✅	eval	33	33
⬜	runtime	0	0
⬜	stdlib	0	0
⬜	e2e	0	0

Generated by lib/go/conformance.sh.

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322 B

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