giles e222e8b0aa scheme: Phase 2 evaluator — env.sx third consumer + 23 tests [consumes-env] ...

lib/scheme/eval.sx — R7RS evaluator skeleton:
- Self-evaluating: numbers, booleans, characters, vectors, strings
- Symbol lookup: refl-env-lookup
- Lists: syntactic-operator table dispatch, else applicative call
- Table-driven syntactic ops (Phase 2 wires `quote` only; full set
  in Phase 3)
- Apply: callable host fn or scheme closure (closure stub for Phase 3)

scheme-make-env / scheme-env-bind! / etc. are THIN ALIASES for the
refl-env-* primitives from lib/guest/reflective/env.sx. No adapter
cfg needed — Scheme's lexical-scope semantics ARE the canonical
wire shape. This is the THIRD CONSUMER for env.sx after Kernel and
Tcl + Smalltalk's variant adapters; the first to use it without
any bridging code. Validates the kit handles canonical-shape
adoption with zero ceremony.

23 tests in lib/scheme/tests/eval.sx cover literals, symbol
lookup with parent-chain shadowing, quote (special form + sugar),
primitive application with nested calls, and an env-as-value
section explicitly demonstrating the kit primitives work on
Scheme envs.

85 total Scheme tests (62 parse + 23 eval).

chisel: consumes-env (third consumer for lib/guest/reflective/env.sx).

2026-05-13 20:00:36 +00:00

4.7 KiB

Raw Blame History

View Raw