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eval.sx grows: five new syntactic operators wired via the table-
driven dispatch from Phase 2. lambda creates closures
{:scm-tag :closure :params :rest :body :env} that capture the
static env; scheme-apply-closure binds formals + rest-arg, evaluates
multi-expression body in (extend static-env), returns last value.
Supports lambda formals shapes:
() → no args
(a b c) → fixed arity
args → bare symbol; binds all call-args as a list
Dotted-pair tail (a b . rest) deferred until parser supports it.
define has both flavours:
(define name expr) — direct binding
(define (name . formals) body...) — lambda sugar
set! walks the env chain via refl-env-find-frame, mutates at the
binding's source frame (no shadowing). Raises on unbound name.
24 new tests in lib/scheme/tests/syntax.sx, including:
- Factorial 5 → 120 and 10 → 3628800 (recursion + closures)
- make-counter via closed-over set! state
- Curried (((curry+ 1) 2) 3) → 6
- (lambda args args) rest-arg binding
- Multi-body lambdas with internal define
109 total Scheme tests (62 parse + 23 eval + 24 syntax).